Test Peerless / Tymphany XT25TG-30 / 04 (Vifa XT-300 / K4)

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m
Vifa XT-300 (XT25TG-30 / 04)An extraordinary tweeter, equipped with a 5mm thick front panel, a 5-hole attachment and a "bead only design" as a membrane.

Vifa / Peerless XT-300 K4 (XT25TG-30/04) sound pressure & impedance (dispersion)

Vifa XT-300 (XT25TG3004) Frequency response and impedance response

Outstanding linear frequency response. Full level from 1,3kHz. Extremely good-natured "roll-off". The efficiency is on average 91,5dB / 2,83V. One copy has a resonance frequency that is 20% higher, but this has no effect in the intended working range. Otherwise congruent course from 1,5 kHz. Very well. At the frequency response you have to look very closely to see whether there are 2 or 3 drivers. Practically congruent course from 600Hz.

Vlt. a little note at this point:

I do not buy any preselected drivers ... With such a result, one might suspect that.

 Vifa/Peerless XT-300 K4 (XT25TG-30/04) sound pressure at angles (15°, 30°, 45°, 60°)

Vifa Peerless XT-300 (XT25TG3004) Angle Measurements

Very uniform omnidirectional behavior. Somewhat stronger directivity than with 25mm calottes. No criticisms. Recommendation: Tuning linearly to 15 °.

Vifa / Peerless XT-300 K4 (XT25TG-30 / 04)

Vifa Peerless XT-300 (XT25TG3004)

Vifa Peerless XT-300 (XT25TG-30/04) Transient behavior sonogram

Extremely smooth and fast swinging over all frequencies.

Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) harmonic distortion

Vifa Peerless XT-300 (XT25TG-30 / 04) Harmonic
Gray line: 1%
Graph switches every 3 seconds
Outstandingly low 3rd order distortion. From 1,5kHz <0,1% at all measured levels. The "good-natured" K2 rises relatively sharply below 3kHz. A little bit of "whitening" is built in. In the case of separations> = 2kHz, K2 should still remain below the perceptibility threshold, even at very high levels.


Frequency response / directional behavior:4.5 5 out of stars
Range:4.5 5 out of stars
Power handling:4.5 5 out of stars
Consisty:5 5 out of stars
Haptics:4 5 out of stars
Price-performance:5 5 out of stars


The ring emitter Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) is outstanding in the sum of its properties!

The frequency response is linearly smooth, the omnidirectional response is extremely even and the decay behavior could not be better.

The ring emitter can be used in very level-stable combinations from 2kHz. With "normal" level requirements also lower.

Series spread seems a foreign word for the driver. Furthermore, its intended working range is far outside the region around the resonance frequency that is prone to series fluctuations due to the design of tweeters. It is generally not recommended to separate tweeters> = 2x FR for nothing.

and the whole thing for extremely inexpensive 47 € (RRP) ...

I have installed the XT-300 K / 4 with the SPH-175HQ in the kit Samuel HQ, and I am very pleased with its features.

Go to the Samuel HQ kit


Test Peerless DX25TG09-04 (Vifa XD-270 F / 4) Dome tweeter 4 Ω

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Test Vifa / Peerless XD-270 F / 4 (DX25BG60-04)

Frequency response and impedance (consisty)

Vifa / Peerless XD-270 F / 4 (DX25BG60-04) Amplitudes and Impedance (Scatter)

Very broadband. Full level from 1,1kHz. Apart from a slight dip around 8,5kHz very linear. This shows neither in the decay behavior, nor in the distortion diagram and is therefore classified as harmless. Assign you is probably the conspicuously thick bead. This is supported by the disappearance of burglary under angles.

The average efficiency is 93dB / 2,83V. Compared to 8 Ohm drivers, 3dB must be subtracted.

Both drivers behave almost congruently up to 10kHz, above that they fluctuate a maximum of + - 0,5dB, which is absolutely harmless.

The impedance paths are congruent in the area of ​​effect.

Addendum: New measurement, now with 4 drivers.

Series dispersion seems to be hardly an issue for the XD-270 F / 4. Still practically congruent course, only in the top octave with minimal deviations (Max. + -0,5dB).

 Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Vifa / Peerless XD-270 F / 4 (DX25BG60-04) Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Good to see that the mentioned sink from 30 ° no longer comes to bear. The straightening behavior of the DX25TG09-04 is very good. Under 30 ° the 20kHz is easily reached, which is unusual for a dome of this size.

Burst decay

Vifa / Peerless XD-270 F / 4 (DX25BG60-04)

Overall, very smooth and rapid decaying over all frequencies.

harmonic distortions

Vifa / Peerless XD-270 F / 4 (DX25BG60-04) harmonic distortion
Gray line corresponds to 1%. Picture change every 3 seconds.
Overall, the DX25TG09-04 has outstanding low harmonic distortion. K3 remains below 900% at all measured levels as of 0,3 heart and runs largely independent of the excitation signal.

K2 increases with the level, runs very evenly and could be quite a steep separation to 1,5 Khz (possibly even lower) to. The 1% mark would not be exceeded even with 95dB / 1m.


Frequency response / directional behavior:4 5 out of stars
Range:5 5 out of stars
Power handling:4.5 5 out of stars
Consisty:4 5 out of stars
Haptics:4 5 out of stars
Price-performance:5 5 out of stars


The Peerless DX25TG09-04 is in many ways an unusual tweeter. A 5mm strong front panel (identical to the XT-300), a surround that could more easily be attributed to a midrange driver, an 5 hole mount and the very low resonant frequency despite the absence of the back chamber.

The distortion values ​​are exceptionally good and, in combination with the low resonance frequency, allow a separation of around 1,5 kHz.

Only the collapse of 8,5kHz spoils the otherwise impeccable impression a bit. Through clever wiring, however, a + -1dB linear frequency response can still be achieved.

This tweeter gets a thick recommendation

Furthermore, he seems to me in the sum of its properties to be a very interesting candidate for a waveguide. In addition more timely.

Addendum: The assumption has been confirmed: Test Peerless DX25TG09-04 with waveguide



Test Seas Noferro 900 (H 1025-06)

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Seas Prestige Noferro 900 (H 1025-06)

27mm dome tweeter 6 ohm

Seas Prestige Noferro 900 (H 1025-06)

Seas Noferro 900 (H 1025-06) Sound pressure & impedance (dispersion)

Seas Noferro 900 (H 1025-06) Sound Pressure Impedance Scattering

Excellent linearity. Full level already from 1000 Hertz. The efficiency is above average with 92 / 2,83V for an 25mm dome with a nominal impedance of 6Ω.

The amplitude, impedance and impedance paths of the two drivers are almost congruent.

Seas Noferro 900 (H 1025-06) sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Seas Noferro 900 (H 1025-06) Angle Measurements

Very clean and uniform bundling behavior.

Also in super high for a tweeter with 26mm voice coil very wide beam.

Seas Noferro 900 (H 1025-06) decay behavior

Seas Noferro 900 (H 1025-06) Swinging out

Overall, very smooth and rapid decaying over all frequencies. Minimally delayed by 16kHz.

Seas Noferro 900 (H 1025-06) harmonic distortion

Seas Noferro 900 (H 1025-06) harmonic distortion

Very low 3rd order distortion. Even at 95dB / 1m it always stays below 0,3%, and that from 1khz. K2 is strongly dependent on the excitation signal, rising below 3kHz. Recommended separation:> = 2kHz (18dB / octave) Overall very low distortion.


Frequency response / directional behavior:4.5 5 out of stars
Range:4 5 out of stars
Power handling:4 5 out of stars
Continuity of series / Without rating /:0 5 out of stars
Haptics:4 5 out of stars
Price-performance:5 5 out of stars


As a classic shows what he can.
In all disciplines, the Seas Noferro 900 shows very good readings.
Noteworthy are the ruler-smooth frequency response on the axis and the very clean omnidirectional behavior.
A really fine tweeter.
As already said the Klang & Ton (04/2000):

There is simply nothing wrong with this tweeter ...


Test Monacor DT-101SK

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Test Monacor DT-101SK

Frequency response and impedance (consisty)

 Test Monacor DT-101SK

Test Monacor DT-101SK
Good linearity. Almost full level already from 1,1kHz. The efficiency is, with an average of 92dB / 2,83V, above average. All 3 drivers are almost congruent in their amplitude response. Very good.

The impedance response scatters a little more, especially around the resonance frequency. There is a slight interference around 2,3 kHz. This is also evident in the amplitude frequency response with a slight dip.

Unfortunately, when measuring 7 new specimens have a very unpleasant picture.

The spread of the measured specimens is considerable and amounts to + -1dB at 5kHz, + -3db at 3,5kHz, above this it gets a little better. The resonance frequency varies between 1,1 and 1,8 kHz. None of the specimens is nearly as linear as the first 3 measured.

With at least 3 of the measured specimens, it can be assumed that the voice coils are decantral to such an extent that they “clamp” on one side.

The black curve is one of the three first measured DT-101SK and thus serves as a reference.

Monacor DT-101SK sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Test Monacor DT-101SK

Quite even omnidirectional behavior. For a 25mm dome, the frequency response goes up very far. No points of criticism.

Monacor DT-101SK decay behavior

Even and fast swinging out.

Monacor DT-101SK harmonic distortion

Test Monacor DT-101SK
Gray line equals 1%

The harmonic distortion is low. K3 remains below 900% at all measured levels from 1Hz. From 1,2 kHz even below 0,3%. K2 rises evenly with the level and always remains at a very low level. Higher order distortion components are completely negligible.


Frequency response / directional behavior:4 5 out of stars
Range:4 5 out of stars
Power handling:4.5 5 out of stars
consisty:1 5 out of stars
Haptics:3 5 out of stars
Price-performance:1 5 out of stars


The Monacor DT-101SK measures itself well in all respects.

It is very broadband applicable. A lower crossover frequency of 1,5 kHz is definitely feasible, depending on the concept and level requirements. The omnidirectional behavior is equivalent to a 25mm dome without sound guide. The touch quality and workmanship are okay, the harmonic distortion is low.

And the whole thing for cheap 33,90 € (RRP)


There are, at least with one of the measured batches, considerable problems in terms of manufacturing consistency.

Test Wavecor TW022WA06 Dome tweeter 4Ω with sound guide

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Wavecor TW022WA06


Wavecor TW022WA06 sound pressure & impedance (dispersion)

Wavecor TW022WA06 amplitude and impedance (dispersion)

Very good linearity with a slight increase from 2 to 7kHz, which can be easily equalized with the crossover and / or a clever arrangement on the baffle. From 15kHz slightly decreasing amplitude response. Full level from 1kHz, with an average efficiency of 91dB / 2,83V.

Both drivers are practically congruent in the frequency response as of 1,5khz.

There are no disturbances in the impedance path. In both drivers practically congruent.

 Wavecor TW022WA06 Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Wavecor TW022WA06 Angle Measurements 0-60 °

Extremely uniform omnidirectional behavior thanks to the sound transmission. The combination of sound guide and dome is extremely well done.

Wavecor TW022WA06 Lingering behavior

Wavecor TW022WA06 Lingering behavior

Even and very fast decay over all frequencies. No criticisms

Wavecor TW022WA06 harmonic distortion

Wavecor TW022WA06 harmonic distortion

The harmonic distortion is sensational for such a small (22mm voice coil) calotte. K3 remains below 95% even at 0,15dB, starting at 1,3kHz.

K2 increases slowly below 3kHz, but still allows for a separation around 1,5kHz. Even with such a deep separation, the 1% mark would not be reached. Higher-order distortion components are completely negligible. If you aim for very low-distortion loudspeakers, it will separate at 2kHz.


Frequency response / directional behavior:4.5 5 out of stars
Range:4.5 5 out of stars
Power handling:4 5 out of stars
Series constancy / without rating:0 5 out of stars
Haptics:5 5 out of stars
Price-performance:5 5 out of stars


Wavecor TW022WA06 does not have any weaknesses in metrology

  • wide frequency response
  • very good omnidirectional behavior
  • sensational (for a 22mm voice coil) lower K3
  • very good workmanship and touch quality
  • Can be used from 1,5kHz !!!
  • supposedly very low dispersion

... and all for a very affordable 45 € (as of October 2013)!

Test Monacor DT-99 One of the cheapest tweeters in the Monacor range

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m
Test Monacor DT-99

Monacor DT-99 sound pressure & impedance (dispersion)

Monacor DT-99 frequency response

Good linearity with full level from 2000Hz. The average efficiency is 90dB / 2,83V. Considering the fact that it is an 8 ohm driver, a good value (compared to 4 ohm tweeters you would have to add 99 dB to the DT-3). The amplitude responses of the two measured drivers unfortunately vary significantly below 5kHz.

Monacor DT-99 sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Monacor DT-99 angle
Uniform and for a 25mm dome typical omnidirectional behavior.

Monacor DT-99 decay behavior

Monacor DT-99 decay behavior

Even and fast decay over all frequencies.

Monacor DT-99 harmonic distortion

Monacor DT-99 distortion

The Monacor DT-99 shows low harmonic distortion from 2kHz. Recommended separation:> = 2kHz with at least 12dB / octave.


Frequency response / directional behavior:3.5 5 out of stars
Range:4 5 out of stars
Power handling:4 5 out of stars
Constance / without rating /:0 5 out of stars
Haptics:3 5 out of stars
Price-performance:3.5 5 out of stars


A very inexpensive tweeter with decent measurements. Unfortunately, the two measured specimens scatter more than hoped. The internal structure (especially the centering of the oscillating unit) is designed to be a bit “windy”. Otherwise the measurement results are impeccable across the board. Can be used from 2,5 kHz.


Variable crossover with wagos

A crossover clipboard (switchboard) that really works

Anyone who has ever tried to develop a loudspeaker certainly knows the problem of the often necessary component change in the development switch. Various solutions This is as convenient, quick and above all as possible. In this regard, "in circulation" must be designed to be reliable in terms of measurement technology.

In the sound and sound 3 / 2007 has been a switchboard with the cheap speaker terminals. I had ordered a bag full of such terminals. After the inspection of the terminals, I decided not to set up the switch board.

Speaker terminal

The problem with these terminals was the too high contact resistance. A thin and very soft sheet of metal is pressed onto even softer plastic, and the whole thing with the power of, let's say household rubber ... How should a connection be made that is equal to the soldering point?

Not much better cut for this purpose gladly taken crocodile clips. Contact resistance of ~ 0,3 Ω is not uncommon.

All that remains is the reliable, but not exactly comfortable luster terminal, or do all soldering ...?

A small linked picture in the Diy hifi Forum But then I still got on the funnel ...

The alternative is called Wago, and looks like this:

Wago with terminal line

To understand why these clamps work so well, I recommend the following video:

(Product information from Wago)

So, off to the hardware store (better of course to the local electronics retailer) and 2 packs purchased and glued with hot glue on a piece of pressboard:

The finished crossover clipboard

Variable crossover with wagos

In this case, an 2 way execution. Red is the plus lead, blue goes to the drivers, black the mass. Time required approx. 20 minutes. Cost ~ 15 €.

The orange levers are clearly on train. There is really tension behind it. If you take the connected components out again you can see that there is actually a notch in the metal => If you often install and remove the same component, the wire will break off at some point. It is best to apply stranded wire to the components and tin the ends. The images of the Wagos take everything up to 2,5mm². Regardless of whether it is a solid cable or stranded wire.

Lines that are "permanently" installed should also be tinned to prevent possible corrosion of the copper.

What should also be mentioned: The board is extremely flexible, and some possible applications only become apparent during use. Measure only one driver? Click-cable-pull-measure-plug-click-ready ...

But now to important part: How do the Wagos beat compared to soldered components?

To find out, I first 6 resistors á 0,15Ohm first in the terminal board in series and then soldered the same resistors and measured both variants.

With quite a surprising result:

Development crossover with Wagos measurement

Development crossover with Wagos comparison

The soldered variant has higher contact resistances than the Wago variant (0,002Ohm distributed over 5 connections).

To make sure that no solder joint was faulty, I still measured these individually:

Development frequency crossover measurement solder joint

R <= 0,001 ohms. The result was the same for all solder joints.

And finally ...

It can definitely be assumed that the turnout created on the "Wago clipboard" will be congruent with the soldered one. In developing the Direct-HA Edition the switchboard came into action for the first time and did exactly what it should do. The measurements of the soldered points were identical to those of the terminal board. Also came to me the idea to build series in some of my points Wagos, eg. for the voltage divider of the tweeter, in order to carry out modifications easily and quickly at any time.

Test Vifa Peerless XT-25 / Neo4 (XT25SC90-04)

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m
Vifa XT-25/Neo4 (XT25SC90-04)

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04), a very level-resistant, small neodymium ring emitter, can be used wherever it gets tight ...

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) amplitude response dispersion

Vifa XT-25 / Neo4 (XT25SC90-04) Frequency Response (Scatter)

Good linearity. Full level already from 0,9kHz!

With 91,5dB / 2,83V, the efficiency is average for an 4Ohm driver and sufficient for 95% of all applications.

At 4khz there is an interference point that also shows up in the impedance response, but not in the decay behavior. With clever wiring of the Peerless XT-25 / Neo4, you can "conjure up" a 2dB dip around 3,5kHz from the cant, which is usually perceived as very pleasant. D.

The amplitude responses of the two drivers are practically congruent. Very good

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) Impedance (Scatter)

Vifa XT-25 / Neo4 (XT25SC90-04) Impedance gear


The 830Hz resonant tip of the ring radiator shows that no ferrofluid was used. A minimal disturbance can be seen in 4kHz, which also shows in the amplitude response. The impedance paths of the measured drivers are congruent. Exemplary.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) Sound pressure at angles (0-90 °)

Vifa XT-25 / Neo4 (XT25SC90-04) Angle Measurements 0-90 °

Due to its large diaphragm (30mm diameter) the ring radiator straightens more than 25mm calottes, but very evenly. Many Tüfftler appreciate this property when coupling the Peerless XT-25 / Neo4 to a waveguide.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) decay behavior

Vifa XT-25 / Neo4 (XT25SC90-04)

Overall, very smooth and rapid decaying over all frequencies. No criticisms.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) harmonic distortion

Vifa XT-25 / Neo4 (XT25SC90-04) harmonic distortion


K3 is extremely low up to 2kHz, below which it rises steeply. K2 rises evenly below 3kHz. However, in my opinion nothing stands in the way of a separation of around 2kHz. In combination with two 5 ″ drivers, I already disconnected at 1,7kHz and the dome copes with that without any problems. Even there, K2 hardly scratches the 1% mark. Overall really good values.


Frequency response / directional behavior:4 5 out of stars
Range:4 5 out of stars
Power handling:4.5 5 out of stars
Consisty:4.5 5 out of stars
Haptics:4 5 out of stars
Price-performance:4.5 5 out of stars


Level fixed small tweeter which is very universally applicable.

Due to the large membrane, it can be very loud and can be used from 2kHz.

Due to its "special" directional effect, the ring emitter is very well suited to be combined with a waveguide (eg WG-300 from Monacor). Then the distortion drops below 2kHz and nothing stands in the way of a separation of 1,5kHz.

Predestined is the Peerless XT-25 / Neo4 for d'appolito, - and all other arrangements in confined spaces.

To emphasize is the very small dispersion. The two measured specimens of the ring radiator are practically congruent both in amplitude and impedance.


Test Monacor DT-25N

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Monacor DT-25N

Monacor DT-25N sound pressure (dispersion)

Monacor DT-25N frequency response

Very good linearity. Full level from 1,8kHz (exception blue). High efficiency (94dB / 2,83V). From 3kHz low dispersion, below that up to + -2dB. No problems are to be expected with separations> = 2,5 kHz.



Monacor DT-25N impedance (dispersion)

Monacor DT-25N impedance gear

No disturbances recognizable. The different pronounced impedance peaks indicate different quantities of ferrofluid.

From 3kHz almost congruent course.



Monacor DT-25N sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Monacor DT-25N frequency response at angles

Monacor DT-25N shows a good and uniform directional characteristic.

Monacor DT-25N decay behavior

Monacor DT-25N decay behavior

Overall smooth and fast decay over all frequencies.

Monacor DT-25N harmonic distortion

Monacor DT-25N distortions
The gray line corresponds to 1%
From 3kHz low harmonic distortion. If separated by 3kHz, K2 stays well below 1%. K3 rising sharply below 2kHz, practically not available. Higher order clutter components are negligible. The measurement was carried out at 95dB / 1m.


Frequency response / directional behavior:4 5 out of stars
Range:3.5 5 out of stars
Power handling:4.5 5 out of stars
consisty:3.5 5 out of stars
Haptics:4 5 out of stars
Price-performance:4 5 out of stars


Monacor DT-25N is a really great little tweeter. Can be used especially in confined spaces such as d'appolito arrangements or eg Direct HA Edition.

DT-25N can be loud, usable from 2,0khz with an efficiency of 94dB / 2,83V.
In addition to increased efficiency, the "croissant" also offers very good contact protection.
The downside is the spread below 3kHz. Hence my recommendation of a separation> = 2,5kHz.

Unfortunately DT-25N was not spared the price increases of many neodymium tweeters. Nevertheless, it still offers a very good value for the price.


Direct "HA Edition" with Monacor SPH-176 MSH-116 and DT25-N Improved edition of the center speaker "Monacor Direct"

Direct HA Edition

Case Direct HA Edition

Technical data

  • Impedance: 4 Ohm
  • Sensitivity (2,83V/1m): 89 dB
  • Dimensions (HxWxD): 240 x 600 x 300 mm
  • Crossover frequencies: 360 / 3000 Hz
  • Principle: 3 way CB


  • high quality center-speaker in ambitious home-cinema installations
  • also usable as main or rear-speaker




Monacor DT-25N

Heißmann-Acoustics: Test

Monacor MSH-116 / 4

sound +Sound 2 / 01

"This chassis is the surprise of Tests. Highly recommended!"

Monacor SPH-176

Sound + sound 06 / 2003

The SPH-176 gives almost the ideal picture of a classic mid-woofer.


A successful combination + very linear frequency response + many successful detail solutions + quite large linear stroke + very good price


Case Direct HA Edition


Cost example (ehighend.de Stand 12 / 2017)


Buy cabinet kits

For the detailed development report


Development Report Monacor Direct HA Edition Part 2 Metrological documentation for the development of the center speaker Monacor Direct HA Edition ...

Development Report for Center Monacor Direct HA Edition

Monacor Direct HA Edition Sonogram

Measurements of the original Direct in Part 1 of the development report of the Monacor Direct HA Edition

So now dire (c) (k) t into the action.

In general, at the beginning of each speaker development are the creation of a concept, driver selection, housing vote, Edgefimmelei, etc. All this could (or had to) save me. The concept was predetermined. So first the drivers in the case were measured, to see how you want to be ultimately sonicated.

In the following the measurements:

Amplitude frequency response Monacor DT-25N 0 °, 30 °, 60 °, 90 °


 Monacor DT-25N harmonic distortion

Monacor DT25N Harmonic Distortions

The DT-25N “sees” the symmetrically neighboring TMTs, which is evident from the break-in (2kHz) and rearing (3kHz) below 30 °. Rounding off the familiar case hardly brought any improvement. With what problem no. 1 was specified. The distortion values ​​are completely within the framework. The gray line stands for 1% distortion (also in the following diagrams). From 2,5Khz, K2 remains below this, apart from the small peak at 10kHz. I consider this to be completely harmless. In practice it means that a 10kHz tone is accompanied by a 39 dB quieter 20kHz tone. In addition, I did not measure this "peak" on all DT-25N. K3 can be completely neglected from 2kHz. Higher order distortion components as well.

Amplitude frequency response Monacor MSH-116 / 4 0 °, 30 °, 60 °, 90 °

Monacor MSH116 Angle Measurements 0 °, 30 °, 60 °, 90 °

Harmonic Distortions Monacor MSH-116 / 4

Monacor MSH116 Harmonic Distortions

The MSH-116 also obviously sees its neighbors, but does not react quite as violently as the DT-25N. It is unfavorable that both the DT-25N and the MSH-116/4 behave very similarly around 2-4Khz at angles. Thus, one cannot compensate for the “wrongdoing” of the other. The harmonic distortions look good. The K2 increasing towards low frequencies recommends a separation> = 300Hz.

Amplitude frequency response Monacor SPH-176 0 °, 30 °, 60 °, 90 ° (2 driver in parallel)


Harmonic distortion Monacor SPH-176 (2 driver in parallel)

Monacor MSH116 Harmonic Distortions

Not much needs to be said about this. A deep separation is required to counteract the break-ins due to the horizontally symmetrical arrangement. The positive effect of the arrangement is a directional effect of the woofers right into the area in which you actually work as an omnidirectional speaker. Judging by the distortion values, a separation of <= 400 Hz should be aimed for. The need for this is given by the amplitude frequency response at angles anyway.

These were the guidelines. From there a clean round radiating speaker to develop the task.

The greatest difficulty was to achieve a healthy mean of linear frequency response on axis and at the same time below 15 ° -45 °. The fluctuations of the DT-25N and the MSH-116 between 1kHz and 4kHz are to be regarded as given. You can't magic them away ... The game with crossover frequencies and slope steepness began. I simulated, set up, measured pretty much every separation between 2kHz and 4,5kHz with slopes of 6dB / oct to 24dB / oct and then also listened to many of them. Some longer, some only a few bars. I often thought it was good now, and the next day I wanted to know again.

The final vote took place under 15 °. This roughly corresponds to the listening position of two people on a couch in 2,5m distance to the center speaker, which is probably a very common constellation.

Measurements of the center Monacor Direct HA Edition

Sum drivers & reverse null 15 °

Monacor Direct HA Edition Frequency response sum branches and reverse polarity
Sum drivers & reverse null 15 °


The crossover frequencies are 360 ​​and 3050Hz. The level drops evenly by around 20dB from the fundamental to 2kHz. The average efficiency at 2,83V is 89,5dB. The "boom" of the MSH-116 by 10kHz is harmless, as it is 30dB below the characteristic sound pressure. The flanks are symmetrical, the addition clean.

When the midrange is reversed, 15dB is extinguished when TT / MT and 18dB MT / HT are disconnected.

Amplitude frequency response on axis and impedance response

Monacor Direct HA Edition with SPH-176, MSH-116 and DT-25 amplitude response impedance response
Frequency response & impedance response


The harmless collapse at 1,2kHz could not be gotten away. I had quite a few variants without break-in, consequence was always a very restless frequency response under 15-45 °. The on-axis linearity is very good with + -2dB. The slight presence dip already disappears under 15 °, as well as the ripple at 1,2 and 1,8kHz. The increase in altitude from 8kHz compensates for the bundling of the tweeter. If desired, this can be linearized very easily by connecting a Cs to the tweeter in parallel. In general, the speaker can be adapted to your needs due to the many variants tested and a very precise simulation model. The impedance minimum is 3,7Ohm at 120Hz and is not a problem for any modern amplifier.

Group delay

Monacor Direct HA Edition with SPH-176, MSH-116 and DT-25 group delay
Group delay


Which group run times are audible or not provides for discussions in various forums. 2,9ms @ 80Hz is less than 1 / 4 wavelength (that would be about 3,13ms, according to Adam Riese). The delay is imperceptible and an excellent value.


Monacor Direct HA Edition with SPH-176, MSH-116 and DT-25 phase


Constantly falling. No problem.

Burst decay

Monacor Direct HA Edition with SPH-176, MSH-116 and DT-25 decay behavior
Decay behavior Burst-Decay


Very fast and steady decay over all frequencies. Perfectly.

Horizontal dispersion (0-90 ° in 15 ° steps)

Angle measurements 0-90 °


It is easy to see why the "break-in" was on the move at 1,2kHz set a link from your homepage to Fewo-von-Privat.de. At 30 ° and 45 ° this is "filled up". Nevertheless, even below 30 °, a uniform course with a slight drop towards the heights and a linearity of 200-10000Hz of + -2dB.

Isobar diagram of horizontal omnidirectional behavior

Monacor Direct HA Edition with SPH-176, MSH-116 and DT-25 omnidirectional Sonogram
directivity horizontal sonogram


And it became a meditating alien ... who would have thought that. The diagram contains the same information as the one about it, the amplitude frequency responses under angles. In this case, however, in 5 ° steps and from 0-180 °. Please note the scaling.

Harmonic distortion on 85, 90 and 95dB

Monacor Direct HA Edition Distortions
Gray line: 1%
Graph switches every 3 seconds


Up to 3dB, K95 always remains> 50dB below the characteristic sound pressure => 0,3% are not exceeded. That is an extremely good value! The good-natured K2 is also completely harmless: 0,1% - 0,9% at 95dB. Very well!

And finally ...

That was a very intense piece of work and I am extremely satisfied with the result. I hear the speaker, although it is only mono with me, very much like.

The Monacor Direct HA Edition loudspeaker meets all requirements for a very good center in home cinema installations.

There is not much more to say right now. In the future, I reserve the right to supplement / improve here and there. About comments and criticism on your part, I would be happy.

Development Report Monacor Direct HA Edition Part 1 (The Original Direct) Test & metrological documentation of the center speaker Monacor Direct

Metrological documentation of the center speaker Monacor Direct. The findings obtained during the investigation of the original Direct ultimately led to the development of the Monacor Direct HA Edition.

Development Report Monacor Direct Heißmann-Acoustics Edition

PART 1: The original Monacor Direct

 (to the 2 part: Monacor Direct HA Edition)

Monacor Direct HA Edition with SPH-176, MSH-116 / 4 and DT-25N


Monacor Direct is a horizontal center speaker, equipped with reasonably reasonable chassis. The woofers are two SPH-176, Midrange is the MSH 116 and in the treble, the neodymium calotte works DT 25N, When I got a customer request, if I could deliver the kit and if I would find it useful to realize a home theater equipped with 5 this speaker, my answer was the following:

Assembly and arrangement promise a very good speaker, which could act as a high-quality center but also as a main and rear speakers. In order to be able to judge this conclusively, I first have to analyze the switch further

Since I had already recorded the installed chassis metrologically, I was able to create an initially rough simulation, which brought me to the conclusion that I can not recommend this kit so. Neither as a center nor as a main, - or Rearlautsprecher!


The great potential of Monacor Direct is that, contrary to "normal" center constructions in a lying d´appolito arrangement, it can / could achieve a balanced horizontal omnidirectional pattern. In order to achieve this goal, however, one of the things needed is sufficiently deep separation between woofer and midrange, My simulation told me that the separation between SPH-176 and MSH-116 was a bit, let's say, unusual, with the result being a very unbalanced horizontal omnidirectional behavior.

I explained this fact to the customer, and soon we agreed on a new development of Monacor Direct.

The first step for me was to build up the original Direct to substantiate my identified doubts.

Below are the measurements of the original Direct:

Monacor Direct branches and sum 0 °


(blue: Monacor SPH-176, green: Monacor MSH-116, red: Monacor DT-25N)
  • The Monacor MSH-116 plays up to -10dB characteristic sound pressure. This he reaches at about 1750Hz. Above and below it says goodbye with about 6dB / octave
  • There is no real separation from the SPH-176.
  • The falling edges of MSH-116 and SPH-176 are nearly parallel
  • Monacor SPH-176 and Monacor DT-25N look more like a classic 17 / 25 2-way speaker
  • Monacor DT-25 plays very low. Too deep in my opinion. In the following diagram you can see that the DT-25N would cope with such a deep separation, purely from the point of view of the distortion values, but its resonance frequency of 1500Hz clearly speaks for a steep-edged separation> 2000Hz

Harmonic distortions Monacor DT-25N sonicated in the kit Direct

 Monacor DT25N distortion sonicated


For fun I disconnected the MSH-116 and measured it ...

Monacor Direct without MSH-116

Monacor Direct SZV without MT

This looks noticeably similar to the following ...

Monacor_Direct_Hersteller Source: Monacor online catalog “Loudspeaker DIY Now” page 96


 Monacor Direct Impedance

Monacor Direct Impedance

And finally:

Monacor Direct Frequency Response at Angles (0 °, 15 °, 30 °, 45 °, 60 °)

Monacor DT25N angle measurements(black: 0 °, red: 15 °, blue: 30 °, green: 45 °, brown: 60 °)


Up to 15 ° good, above that according to the faulty concept of all lying quasi d´appolito 2-way constructions. Unbalanced at angles> 15 ° with massive drops from> = 30 ° ..

And finally ...

Monacor Direct can not be called a classic 3-way speaker. Technically, it is more a lying 2-way quasi d'appollito center (with filler driver sU). The interpretation of the question of what the MSH-116 was installed at all, I leave you * (I think I have just decided to Duzen in the magazine). What this documentation should also show is that the publication of a frequency response on the axis is still very little about the speaker able to testify.

The Center Monacor Direct has a lot more potential than the one offered.

Therefore it becomes one Hot man Acoustics Edition give this speaker. The turnout development is largely complete ... More on that soon in the 2.TEIL this report.


* Then I was taken at my word, and got an interpretation:

I was made aware by a user in the Diy-Hifi-Forum that the type of wiring of the MSH-116 is called "Filler-Driver" in the original Direct. The concept of the filler driver was first presented in the "Journal Of The Audio Engineering Society" in 1977. The purpose is to eliminate phase problems from Linkwitz and Butterworth filters.

The basic problem of Direct remains despite the well-known name of the filtering ... the horizontal omnidirectional behavior. I will also continue to say that the MSH-116 is a very, very good midrange driver that should be played with a broadband if possible.

But you never stop learning, and I am grateful when I am made aware of gaps and mistakes ...

to the 2. Part, the development report for the Monacor Direct HA edition

Test Monacor DT-300 with Waveguide WG-300 A combination for high level applications with very good directional characteristics

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Monacor DT-300 with Waveguide WG-300

30mm dome tweeter with waveguide


Monacor DT-300 / WG-300 sound pressure (consisty)

Monacor DT-300 & WG-300 amplitude response dispersion



Due to the principle, the frequency response drops evenly towards high frequencies (waveguide), which is very easy to equalize with the crossover. Noteworthy are the two burglaries at 7kHz and 13kHz.

Overall satisfactory dispersion. From 2-14kHz all 4 DT-300 / WG-300 move in a hose of + -1dB, above and below a little worse.

Addendum: As for the Kits Cinetor and Cinetor HWG, the tweeters have been individually checked for quite some time now, I have several serial measurements of the DTXNUMX on the waveguide.

The 2. Picture shows an example of relatively high, the 3. of very low consisty.

 Monacor DT-300 / WG-300 Impedance (Scatter)

Monacor DT-300 / WG-300 Impedance

The impedance curve of the DT-300 with WG-300 is not very harmonious and of relatively low consisty.
The differently pronounced double hump probably originated in different damping of the pole core bore to the coupling volume and in the extremely generous dose of ferrofluid. Separations below 2,5kHz are only conditionally recommendable.

Monacor DT-300 / WG-300 directivity (0-90 °)

Monacor DT300 WG300 angle measurements
Directional behavior is very uniform, thanks to the waveguide concept.
The bundling behavior <= 2kHz results from the narrow baffle (20cm). Only at angles> = 45 ° does the frequency response become somewhat unsteady above 10kHz. The Monacor DT-300 and the Waveguide WG-300 harmonize well with each other.

Monacor DT-300 / WG-300 burst decay

 Monacor DT-300 / WG-300 decay behavior

Overall smooth and fast decay, delayed by 7kHz and 13kHz.

Monacor DT-300 / WG-300 harmonic distortion

 Monacor DT-300 / WG-300 harmonic distortion

The Monacor DT-300 on the WG-300 shows low harmonic distortions. K2 rises evenly with the level and always stays at a low level. K3 only rises below 2kHz, above that extremely low. Harmonic distortions of higher orders are negligible. Regarding the harmonic distortion one could crossover the combination DT300 / WG300 without hesitation at 1,5kHz. Unfortunately, the impedance response does not allow that.


Frequency response / directional behavior:4 5 out of stars
Range:4 5 out of stars
Power handling:5 5 out of stars
Consisty:1.5 5 out of stars
Haptics:3 5 out of stars
Price-performance:2 5 out of stars


The Monacor DT-300 with the Waveguide DT-300 is on the whole a good tweeter. In particular, the level stability, the high efficiency, the low harmonic distortion and the uniform radiation behavior under angles are to be emphasized.

Big downside is the lack of constancy of the driver.

Cinetor & Cinetor HWG with Monacor SP-6 / 100Pro and DT-300 with WG-300

Kit Cinetor with SP-6 / 100Pro and DT-300 to WG-300Compact loudspeaker, neutrally designed frequency response. Especially interesting for home cinema systems. Perfectly working in for bar, - and pub istallations. If using a potent subwoofer, impressive maximum levels are achieved. The HWG version is intended for installation very close to the wall or on-wall installations.

 To the Cinetor-EVO ... the improved successor

Technical data

(Cinetor / Cinetor HWG)

  • Nominal impedance: 4 Ω / 6 Ω
  • Characteristic sound pressure (2,83V / 1m): 90 dB / 92dB
  • Maße (HxBxT)mm: 380x200x280/395x200x284
  • Crossover frequency: 2000 Hz / 2100Hz


  • Home theater (with subwoofer support)
  • Monitoring
  • Bar & pub sound
  • ambitious stereo installations


Monacor DT-300 / WG-300


Monacor SP-6 / 100Pro

Sound + sound 02 / 2006

From the professional corner - with optimal heat dissipation - high efficiency - with smooth frequency response.

Measurements Cinetor

Measurements Cinetor HWG