Datasheet © heissmannacoustics.de  
Measurements in DIN baffle in 50cm distance at 2,83V. Level scaled to 1m.  
Frequency response 2,83V / m & impedance 
Even frequency response with smooth XCHARXRollOffXCHARX. Slight interference around 10kHz.
Due to the waveguide very high efficiency of 95,5dB / 2,83V / m. By thin fluid ferrofluid slightly damped, very symmetrical resonce at 1,1kHz 

Consisty 
The 4 measured copies run, in the working area, nearly congruent, both in the amplitude,  and impedance response with a maximum deviation of + 0,35dB.  
Directivity horizontal (0°, 15°, 30°, 45°, 60°)

Wide dispersion up to ~ 2,5kHz, then rapidly and evenly getting narrower towards the super highs.


Burst decay 
Overall, very even and rapid burstdecay, minimally delayed in the super high.  
harmonic distortion (90, 95 & 100dB / m) 
Very low harmonic distortion, at all measured levels> 1,5 kHz
K3 barely exceeds, even at 100 dB / m, the 0,1% mark . K2 remains inaudible. 

Rating

ConclusionThe ScanSpeak Discovery H2606 / 920000 is a fine tweeter, which, when used wisely, leaves practically nothing to be desired. Without hesitation, it can be used from 1,5kHz, even with high level requirements. Depending on the application possibly even deeper. Due the somewhat special dispersion this tweeter asks for a mindfull connection to te midwoofer. The H2606 is used in the kit SuzyQ


Keyword: Test
Test ScanSpeak Discovery D2604 / 830000 with WG PCT300 / WG300 26mm dome tweeter 4 Ω with waveguide
Datasheet © www.heissmannacoustics.de  
Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.
The Waveguide was milled with a CNC adapter plate mounted on the tweeter. 

Directivity horizontal (0°, 15°, 30°, 45°, 60° & 90°) & Impedance... normalized to 0° (sonogram) 
Due to the waveguide systemrelated symmetrical peak from 110kHz. Extremely uniform directivity without significant disturbances. In the main very close to "Constant Directivity". The slight widening around 2,5kHz can be equalized by skillful choice of the midrange and its filtering. 

Burst decay 
Overall, very smooth and rapid decaying over all frequencies.
Minimal delayed in the super high tones. 

harmonic distortions (90105dB / m) 
K3 remains, even at 105dB / m> 1kHz in the range
K2 rises evenly with increasing level and does not exceed the 1% mark by> 1kHz until levels> 100dB. Outstanding! 

Rating

ConclusionThe ScanSpeak D2604 / 830000 measures itself at the Waveguide, apart from the ~ 1dB lower efficiency practically identical to the D2604 / 833000. Hence the same conclusion:


Test ScanSpeak Discovery D2604 / 833000 with WG PCT300 / WG300 26mm dome tweeter 4 Ω with waveguide
Datasheet © www.heissmannacoustics.de  
Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.
The Waveguide was milled with a CNC adapter plate mounted on the tweeter. 

Directivity horizontal (0°, 15°, 30°, 45°, 60° & 90°) & Impedance... normalized to 0° (sonogram) 
Due to the waveguide, systeminduced symmetrical peak from 110kHz. Extremely uniform directivity without significant interference. In the main very close to "Constant Directivity". The slight widening around 2,5kHz can be equalized by skillful choice of the midrange and its filtering. 

Burst decay 
Overall, very smooth and rapid decaying over all frequencies.
Minimal delay in the super high frequency> 15kHz. 

harmonic distortions (90105dB / m) 
K3 remains at <xnumx% at="" all="" measured="" levels,="" even="" xnumxdb="" m=""> 105kHz, and is largely independent of the excitation signal.</xnumx%>
K2 rising evenly with increasing level and exceeds the 1% mark appreciably only at levels> 100dB. Outstanding! 

Rating

ConclusionThe reader may have noticed one or the other similarity to the Peerless DX25TG0904 (Vifa XD270 F/4) with Waveguide ... The ScanSpeak is practically equivalent in all respects. It measures on axis a touch more restless, can play minimal louder, could probably be crossed slightly deeper, . 

Test ScanSpeak Discovery D2604 / 833000 26mm dome tweeter 4 Ω
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m.  
Frequency response and impedance (consisty) 
Extremely broadband frequency response. Full level from 1,1kHz, with good linearity. The average efficiency is exceptionally at 93dB / 2,83V. Impedance is flawless. The resonant frequency with 430 respectively 440Hz is below the manufacturer's specification of 475Hz. Both drivers behave almost congruently both in amplitude and impedance. 

Directivity horizontal (0°, 15°, 30°, 45°, 60°) 
Directivity of the ScanSpeak D2604 / 833000 is even and balanced throughout the entire transmission range.
In the top octaves> 10kHz significantly wider radiating than, due to the effective membrane area of 8cm², would be expected. 

Burst decay 
Overall smooth and fast decay over all frequencies.
> 10kHz minimal delay. 

harmonic distortions 
The ScanSpeak D2604 / 833000 has outstanding low harmonic distortions.
K3 remains below 1% at all measured levels> 0,5kHz largely independent of the excitation signal. K2 increases with the level, extends very evenly and would not reach the 1% to 1dB / m even with a crossoverpoint at 100kHz! 

Rating

ConclusionWith an effective membrane area of 8cm², a resonant frequency <xnumxhz and="" the="" very="" low="" harmonic="" distortions,="" driver="" invites="" to="" be="" deeply="" crossed="" eg.="" a="" xnumxer="" midwoofer.="" crossover="" frequencies=""> = 500kHz should be possible without any problems. In smaller systems, eg with a 20er TMT, the ScanSpeak D1,5 / 13 could be crossed even at lower frequencies.</xnumxhz> The concept of a large effective membrane area, in combination with a "standard voice coil" (26mm), and a rather soft dome material works out. Widely radiating in te top octaves, crossable very low, with high load capacity. => ScanSpeak D2604 / 833000 reported waveguide


Test Seas DXT 27TBCD / GB (H149906) 25mm dome with waveguide, 6 Ω
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  


Seas DXT 27TBCD / GB sound pressure & impedance (dispersion) 
Very broadband and symmetrical superelevation from 800Hz to 10kHz, which can be easily equalized with the crossover. This is due to the waveguide and already a first indication of its effectiveness.
The efficiency reaches broadband 95dB but then drops down to 88dB in super high. In the case of linear tuning, therefore, no more than the named 88dB / 2,83V / m are achieved. The impedance response is interferencefree and shows a slightly asymmetrical "resonance hill" around 900Hz. More often seen in tweeters with coupling volume. 

Seas DXT 27TBCD / GB Sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Extremely even directivity into the super high tone. In large parts near the socalled constant directivity Behavior.  
Seas DXT 27TBCD / GB Decay behavior 
Even and fast decay over all frequencies.  
Seas DXT 27TBCD / GB level linearity 85, 90, 95 and 100dBFrequency response level corrected, based on the 85dB measurement

Even and low dynamic compression from 100dB / m <= 0,5dB (Please note the scaling => 20dB range)  
Seas DXT 27TBCD / GB harmonic distortion 
Extremely low harmonic distortion even at 100dB. K2 increases evenly with the level and remains below the 100% mark until 2dB starting at 1kHz.
K3 increasing below 2,5kHz, above that at the measurability limit. 

Rating

Conclusion Nowadays the straightening behavior of loudspeakers is getting more and more important. The Seas DXT stands out in this discipline from the competition. No other known tweeter of this size shows as uniform straightening as the Seas DXT. However, a careful baffle design is required to maintain this behavior. In "normal widths" baffles (~ 20cm) for example. the Seas DXT tends to widen significantly at angles around 3kHz. Work very well:
See also here Also in all other disciplines of the Seas DXT shows without blemish and blame. 

Test Wavecor TW030WA09 30mm dome tweeter with low sound conduction 4Ω
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Wavecor TW030WA09 frequency response & impedance (consisty) 
Very good linearity with evenly decreasing amplitude response. Extremely broadband. The efficiency is on average around 93dB / 2,83V. In the super highs, however, only to 8890dB.
Both drivers are practically congruent in their frequency response up to 10kHz. Above very small deviations. Very good. The TW030WA09 is expressly advertised as "... best consistency" in the manufacturer data sheet. There are no disturbances in the impedance. Practically congruent graph of both drivers. Exemplary. The resonance frequency is at 700Hz. Very low for a driver without coupling volume. The accented resonance peak indicates that there should no ferrofluid be found in the air gap. 

Wavecor TW030WA09 sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Very even and balanced omnidirectional behavior. For a tweeter equipped with a 30mm voice coil even in the super high tones still widely radiating.  
Wavecor TW030WA09 decay behavior 
Very even and fast decay over all frequencies.  
Wavecor TW030WA09 level linearity 85, 90, 95 and 100dB

From 100dB minimum dynamic compression <= 0,5dB in the super high tone.
(Please note the scaling => 20dB range) 

Wavecor TW030WA09 harmonic distortion 
Very low harmonic distortion even with 100dB. K2 increases evenly with the level, hardly exceeding the 100% mark even with the 1dB measurement.
K3 and higherorder distortions play virtually no role. One might be tempted to separate the tweeter with a steep edge at 1200Hz. Who wants to be safe takes 1,5kHz. 

Rating

Conclusion


Test Seas Noferro900 Visaton Waveguide WG148R 4 Ω dome tweeter with Visaton waveguide
Datasheet © www.heissmannacoustics.de  
Measurements in 17x35cm baffle in 70cm distance at 2,83V. level scaled to 1m  
Seas Noferro900 Visaton Waveguide WG148R


Directivity horizontal (090 ° in 15 ° steps)

Due to the waveguide systemrelated symmetrical elevation in the frequency range from 110kHz.
The Seas Noferro 900 and the Waveguide WG148R are a perfect match. Both mechanically and, and in particular acoustically. Directivity is extremly even, up to highest octaves. Just above 3kHz there is a slight widening. This can be further improved by clever connection to an 57 inch midbass driver. That behavior fitted perfectly with midrange speakers of the 15cm class. Crossover points around 23kHz promise excellent results. It should be noted: The combination was measured in a maximum narrow baffle (17cm). Such is usually very beneficial for waveguides in terms of controlled directivity. In the 2. Image, frequency response was roughly linearized by DSP. A shelving filter and a PEQ were set.


Sound pressure standardized at angles to 15 °


impedance 
Flawless impedance.
Very accented, resonance peak at 900Hz, labeling the tweeter as ferrofluidfree. 

Burst decay 
Even and rapid decay over all frequencies. Perfectly.  
Harmonic Distortions 85, 90 and 95dB

The harmonic distortions are extremely low. Only at 10kHz scratched K2 at 95dB / m at the 1% mark ... inaudible. K3 and higher orders are negligible. Crossovers around 1,5kHz with> = 18dB / Oct can be realized without any problems.  
Rating

Conclusion The Seas NoferroXNUMX with the Visaton Waveguide WGXNUMXR measures itself ... ... excellent in all disciplines! There is not much more to say about it. The sum of the EIAs is incidentally, in view of the results, hard to believeXNUMX € (WGXNUMXR: XNUMX € and NoferroXNUMX XNUMX €, as of October XNUMX). 

Test ScanSpeak D3004660000 Illuminator
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
ScanSpeak D3004 / 660000 Illuminator4 Ohm dome tweeter with neodymium drive (AirCirc magnet system) 

ScanSpeak D3004 / 660000 Illuminator Sound pressure at angles (060 ° in 15 ° steps) 
The amplitude response of the ScanSpeak D3004 / 660000 Illuminator is extremely broadband. Full level already from 600 Hertz.
From 600Hz  30kHz + 1,5dB linear with a broadband increase (+ 2dB) of 1,5kHz  6kHz. The average efficiency is 92dB / 2,83V. The omnidirectional behavior can be described as very good. Below 30 °, 20kHz is reached with practically full level. The resonance frequency is extremely low at 470Hz and gives hope for a very deep separability to the TMT / MT. The impedance response shows a minimal disturbance of around 1,5 kHz, which is also reflected in the amplitude response by a "level" that is considered harmless. 

ScanSpeak D3004 / 660000 Illuminator Decay behavior 
Fast and steady decay over all frequencies. A touch of delay indicates 19kHz.  
ScanSpeak D3004 / 660000 Illuminator Harmonic Distortions 
The ScanSpeak D3004 / 660000 illuminator has extremely low harmonic distortion.
At all measured levels, K3 remains below 500% from 0,3 Hz and <1% from 0,1 kHz and is largely independent of the excitation signal. K2 increases evenly with the level, and runs at a very low level. Clinker components of higher order are negligible. 

Rating

Conclusion The ScanSpeak D3004 / 660000 Illuminator is, in the sum of its properties, an excellent tweeter. Very broadband use, extremely low distortion and with very good omnidirectional behavior. There was a considerable design effort to create an extraordinary tweeter. The AirCirc Magnet System (6 Circular Neodymium Magnets) seems to work very effectively. Only the not absolutely linear amplitude response on the axis clouds the otherwise impeccable impression minimal. By skillful wiring and / or selection of the baffle can still achieve a virtually perfectly linear frequency response. Also noteworthy is the noblelooking exterior of the tweeter. The aluminum front panel and the seemingly futuristic magnet system make your heart beat faster, and in the sense of psychoacoustics, the driver will probably (even) sound even better ()) In order to do justice to the called price of RRP 180 €, features are required that set the driver apart from others. In my opinion, these are definitely given with the ScanSpeak D3004 / 660000 Illuminator and the driver is probably his Priceworthy! 

Test Peerless XT19TD0004 (Vifa XT200 K4) Ring radiator, 4 Ω
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
19mm ring radiator from Peerless, distributed by QuintAudio. Equipped with a 4mm front plate, a 4hole attachment, a "bead only design" as a membrane, a coupling volume and excellent measured values ...  
Vifa / Peerless XT19TD0004 (XT200 K4) sound pressure & impedance (dispersion) 
Outstanding linear frequency response. From 2,514kHz + 0,5dB!
Full level from 1,2kHz. Extremely goodnatured "rolloff". With an average of 89,5dB / 2,83V, the efficiency is rather below average. For most applications, however, completely sufficient. Outstanding pair equality in the two measured copies both in impedance,  and amplitude response. The maximum deviation of both drivers> 500 Hertz is + 0,15dB! This testifies to an excellent production consistency. Thanks coupling volume very low resonance frequency around 750Hz. The impedance peaks indicate a dose of lowviscosity ferrofluid. Their slightly different characteristics are completely meaningless, being far out of the usable range. 

Vifa / Peerless XT19TD0004 (XT200 K4) Sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Extremely consistent and a 19mm voice coil corresponding Rundstrahlverhalten.Idealer game partner for broadbeam concepts. Also interesting would be the ring emitter a very small baffle (similar Samira) to provide a uniform directivity to the TMT / MT.  
Vifa / Peerless XT19TD0004 (XT200 K4) Decay behavior

Very smooth and fast decay over all frequencies.  
Vifa / Peerless XT19TD0004 (XT200 K4) harmonic distortion

Outstanding low distortion 3.order. From 2kHz at all measured levels <0,1%. The "goodnatured" K2 increases relatively sharply below 3kHz. A little bit of "enhancement" is built in. Higher order distortion components are practically not apparent. For very levelstable combinations, I recommend separations from 3kHz. Smaller 2way (e.g. with a 4 ″ TMT) can be separated by 2kHz.  
Rating

Conclusion


Test Peerless DX25TG0904 (Vifa XD270 F / 4) at Waveguide WG300 4 Ω dome tweeter with waveguide
Datasheet © www.heissmannacoustics.de  
Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.
The Waveguide was milled with a CNC adapter plate mounted on the tweeter. 

Directivity horizontal (090 ° in 15 ° steps)

Due to the waveguide systemrelated symmetrical elevation in the frequency band of 110kHz. This can be easily leveled with the crossover.
The Vifa Peerless XD270 / F4 goes perfectly with the waveguide WG300. Very even bundling without significant disturbances. The behavior> 10kHz can be described as outstanding. 20kHz are reached even below 45 ° with an almost full level. The amplitude response drops below 45 ° of 218kHz by only 2,5dB! The 30 ° curve runs to 20kHz in a + 1,5dB tight tube. 20kHz are reached at full level. The sonogram shows a bundling behavior that comes very close to the socalled Constant Directivity. 

Sound pressure standardized at angles to 0 ° 

Burst decay 
Minimal delayed decay by 2 and 20kHz. Otherwise perfectly.  
Harmonic distortions

The harmonic distortion of the XD270 F / 4 on the waveguide is excellent.
K2 remains below the 100% mark even at 1,2dB as of 1kHz. K3 moves from 1kHz between 0,04 and 0,3%. Clatter components of higher order are in the (for me) no longer measurable range. Separations from 1,2kHz are possible without hesitation, depending on the application and level requirements possibly even deeper. 

Rating

ConclusionThe Peerless / Tymphany DX25TG0904 on the Waveguide WG300 measures itself outstanding. The possibility of building a loudspeaker that comes close to the requirements of constant directivity. Separations from 1,2kHz. Lowest harmonic distortion even at 100dB / m ... Of course, a very interesting driver for Cinetor. 

Test Peerless / Tymphany XT25TG30 / 04 (XT300 / K4) at the waveguide WG300 / PCT300 4 Ω ring emitter with waveguide
Datasheet © www.heissmannacoustics.de  
Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.
The Waveguide was milled with a CNC adapter plate mounted on the tweeter. 



XT25TG30 / 04 Sound pressure at angles 
Systemrelated exaggeration in the frequency band of 17 kHz. Due to its symmetry, this can be easily equalized with the crossover. It is the purpose of a sound guide to act as an acoustic amplifier. The Vifa XT300 (XT25TG30/04) is an excellent match for the waveguide. Extremely even bundling without any disturbances worth mentioning. Due to the large dome (30mm voice coil), a slightly stronger directivity from 8kHz. Recommendation: plan a slight increase> 8kHz in the high frequency on axis.  
XT25TG30 / 04 Sound pressure standardized at angles to 0 ° 
Here, the frequency response was linearized on axis. The 2. Picture (sonogram) clearly shows the excellent uniform straightening behavior of the combination of XT300 and the waveguide.  
XT25TG30 / 04 decay behavior 
Minimal delayed decay by 2kHz. Otherwise perfectly.  
XT25TG30 / 04 harmonic distortions

As expected, the distortion decreases compared to the variant without waveguide. The XT300 already showed very good distortion even without waveguide, but with a significant increase of K2 under 3kHz. With Waveguide the effect is also present but attenuated by about 5dB. In sum, very low distortion. Even with 100dB, everything from 2kHz remains below 1%. K3 moves at the measurable limit.  
Rating

ConclusionThe Peerless XT25TG30/04 and the Waveguide WG300 are a very attractive combination for extremely levelstable installations, for example in the home theater. Can be used from 1,5 kHz. I think I'll test it out in Cinetor. 

Test Peerless / Tymphany XT25TG30 / 04 (Vifa XT300 / K4)
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
An extraordinary tweeter, equipped with a 5mm thick front panel, a 5hole attachment and a "bead only design" as a membrane.  
Vifa / Peerless XT300 K4 (XT25TG30/04) sound pressure & impedance (dispersion) 
Outstanding linear frequency response. Full level from 1,3kHz. Extremely goodnatured "rolloff". 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 XT300 K4 (XT25TG30/04) sound pressure at angles (15°, 30°, 45°, 60°) 
Very uniform omnidirectional behavior. Somewhat stronger directivity than with 25mm calottes. No criticisms. Recommendation: Tuning linearly to 15 °.  
Vifa / Peerless XT300 K4 (XT25TG30 / 04) 
Extremely smooth and fast swinging over all frequencies.  
Vifa / Peerless XT300 K4 (XT25TG30 / 04) harmonic distortion 
Outstandingly low 3rd order distortion. From 1,5kHz <0,1% at all measured levels. The "goodnatured" 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.  
Rating

Conclusion


Test Peerless DX25TG0904 (Vifa XD270 F / 4) Dome tweeter 4 Ω
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Frequency response and impedance (consisty) 
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 XD270 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 °) 
Good to see that the mentioned sink from 30 ° no longer comes to bear. The straightening behavior of the DX25TG0904 is very good. Under 30 ° the 20kHz is easily reached, which is unusual for a dome of this size.  
Burst decay 
Overall, very smooth and rapid decaying over all frequencies.  
harmonic distortions 
Overall, the DX25TG0904 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. 

Rating

ConclusionThe Peerless DX25TG0904 is in many ways an unusual tweeter. A 5mm strong front panel (identical to the XT300), 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 DX25TG0904 with waveguide 

Test Seas Noferro 900 (H 102506)
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Seas Prestige Noferro 900 (H 102506)27mm dome tweeter 6 ohm 

Seas Noferro 900 (H 102506) Sound pressure & impedance (dispersion) 
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 102506) sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Very clean and uniform bundling behavior.
Also in super high for a tweeter with 26mm voice coil very wide beam. 

Seas Noferro 900 (H 102506) decay behavior 
Overall, very smooth and rapid decaying over all frequencies. Minimally delayed by 16kHz.  
Seas Noferro 900 (H 102506) 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.  
Rating

ConclusionAs a classic shows what he can.


Test Monacor DT101SK
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Frequency response and impedance (consisty) 
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 DT101SK and thus serves as a reference. 

Monacor DT101SK sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Quite even omnidirectional behavior. For a 25mm dome, the frequency response goes up very far. No points of criticism.  
Monacor DT101SK decay behavior

Even and fast swinging out.  
Monacor DT101SK harmonic distortion

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.  
Rating

ConclusionThe Monacor DT101SK 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) Addendum: 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.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  


Wavecor TW022WA06 sound pressure & 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 °) 
Extremely uniform omnidirectional behavior thanks to the sound transmission. The combination of sound guide and dome is extremely well done.  
Wavecor TW022WA06 Lingering behavior 
Even and very fast decay over all frequencies. No criticisms  
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. Higherorder distortion components are completely negligible. If you aim for very lowdistortion loudspeakers, it will separate at 2kHz. 

Rating

Conclusion


Test Monacor DT99 One of the cheapest tweeters in the Monacor range
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Monacor DT99 sound pressure & impedance (dispersion) 
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 DT3). The amplitude responses of the two measured drivers unfortunately vary significantly below 5kHz.  
Monacor DT99 sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Uniform and for a 25mm dome typical omnidirectional behavior.  
Monacor DT99 decay behavior

Even and fast decay over all frequencies.  
Monacor DT99 harmonic distortion 
The Monacor DT99 shows low harmonic distortion from 2kHz. Recommended separation:> = 2kHz with at least 12dB / octave.  
Rating

ConclusionA 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. 

Test Monacor DT25N
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Monacor DT25N sound pressure (dispersion) 
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 DT25N impedance (dispersion) 
No disturbances recognizable. The different pronounced impedance peaks indicate different quantities of ferrofluid. From 3kHz almost congruent course.


Monacor DT25N sound pressure at angles (15 °, 30 °, 45 °, 60 °) 
Monacor DT25N shows a good and uniform directional characteristic.  
Monacor DT25N decay behavior 
Overall smooth and fast decay over all frequencies.  
Monacor DT25N harmonic distortion 
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.  
Rating

ConclusionMonacor DT25N is a really great little tweeter. Can be used especially in confined spaces such as d'appolito arrangements or eg Direct HA Edition. DT25N can be loud, usable from 2,0khz with an efficiency of 94dB / 2,83V. Unfortunately DT25N was not spared the price increases of many neodymium tweeters. Nevertheless, it still offers a very good value for the price. 


Test Monacor DT300 with Waveguide WG300 A combination for high level applications with very good directional characteristics
Datasheet © www.heissmannacoustics.de  
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m  
Monacor DT300 with Waveguide WG300


Monacor DT300 / WG300 sound pressure (consisty) 
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 214kHz all 4 DT300 / WG300 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 DT300 / WG300 Impedance (Scatter) 
The impedance curve of the DT300 with WG300 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 DT300 / WG300 directivity (090 °) 
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 DT300 and the Waveguide WG300 harmonize well with each other. 

Monacor DT300 / WG300 burst decay 
Overall smooth and fast decay, delayed by 7kHz and 13kHz.  
Monacor DT300 / WG300 harmonic distortion 
The Monacor DT300 on the WG300 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.  
Rating

ConclusionThe Monacor DT300 with the Waveguide DT300 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. 