Samuel HQ with Monacor SPH-175HQ and Peerless XT25 TG-30 / 04 (Vifa XT300 K / 4)


  • Impedance: 4 Ohm
  • Sensitivity (2,83V/1m): 89 dB
  • Dimensions (HxWxD): 1100 x 238 x 361 mm
  • Crossover frequency: 1650 Hz
  • Frequency range (-3dB): 36 - 40000 Hz


  • High-grade stereo applications
  • Home theater as well without subwoofer
  • "Relaxed listening"
  • free placement


  • extremely neutral frequency response: + -1,25dB of 50-23.000 Hz
  • Exceptional bass depth (-3dB 36Hz, -8dB 30Hz)
  • D'appolito arrangement => Intensive spatial representation of sound
  • Both horizontally and vertically very well balanced frequency response at angles
  • low distortion, flawless burst-decay
  • optionally closed-box, bassreflex or a combination of both
  • => Very adaptable, even in "complicated" rooms

Test in Klang & Ton 04 / 2013 (excerpt)

Perfectly matched equipment: High-quality woofers and the ringradiator play together as built for each other.


Samuel HQ Angle Measurement 0-45 °
Klang & Ton measurement 0 °, 15 °, 30 °, 45 °

Flawless: On axis frequency response is in the range of plus minus one decibel from fifty hertz to over twenty kilohertz - the -3dBPoints are at 36 Hertz and 40 Kilohertz ...


Balanced it sounds, sovereign and quite ready for acts of deception, which concerns common levels ... profound and dynamic bass ... discoloration-free mids ... The ring radiator ... unobtrusive and extremely supple with a subtle detailing that only gradually draws attention to itself.


Clever driver combination, paired with perfect tuning, results in a box that does everything right.

For the full test on


Tweeter: Peerless XT25 TG-30 / 04 (Vifa XT300 K / 4) / Test

Alternatively: Scan Speak R 2604 / 832000

Woofer: 2x Monacor SPH-175HQ

Klang & Ton 06 / 2012: The SPH-175HQ passed our test course with bravura... Very high-quality driver, which cuts a good figure both in two-way constructions and as a low-frequency specialist


building plan


Cost example ( Stand 12 / 2017)

Buy cabinet kitsThomaier

CNC adapter plate for various Scan-Speak and Peerless tweeters on WG-300 and PCT-300

There are some tweeters from Scan-Speak and Tymphany, all of which share the same front panel. One or the other of them also measures itself excellently on the P-Audio (PCT-300), or Monacor (WG-300) waveguide.

In order to connect the drivers cleanly with the sound guide, an adapter plate milled in CNC was created after many test series, which allows simple and very precise installation.

The following tweeters are suitable for the conversion

3D printed adapter plate in the shop

Construction of the adapter plate with "home remedies"

With a jigsaw, cordless screwdriver, router and the following step-by-step instructions, building the adapter plate yourself shouldn't be a problem. It doesn't even have to be measured 🙂 Let's go ...

  • Download PDF (click on the picture)

  • Print out with Acrobat Reader (select option "actual size"!)
  • Size check: Outer diameter 120mm
  • Stick on a 9mm strong piece of MPX / MDF / screen printing plate (spray glue / glue stick ...)
  • The drilling holes => drill press is an advantage!
  • With the circular milling device (each speaker should have one) 3mm deep to appropriate mark milling (D67mm)
  • Use the jigsaw to saw the inner hole and saw off the plate in the last step

From the practice with the "home remedy method" another supplementary tip from Thorsten (

If you glue your artwork directly onto the substrate (eg MPX), you will have the difficulty to get it down again later. For visual reasons, that bothered me and came up with the following idea: Before you glue your artwork on the MPX, just past the MPX with tape. Now the artwork will be cut to the size of the MPX board. Spray glue is then sprayed onto the package tape and allowed to dry for about 5 minutes (Note the spray adhesive is not on the paper spray!). Now the print template can be glued on.

Once all drilling and milling work has been completed, the package strap can easily be pulled down again from the MPX board.


First, the front panel of the tweeter must be removed. On some models, this is easily fixed with a silicone-like adhesive. In this case, with a large flat-head screwdriver discreetly "lever" as shown in the following picture. Work slowly and evenly. In advance, of course, the screws of the front panel should have been solved (TX10).

Dressing the waveguide neck

The adapter plate is placed on the sound guide and the neck is ground flat with circular movements (⇒ dust mask).

The following video shows the final montage

Contrary to the indication in the video no M3x16mm, but M3x12mm Screws used! The M4x10mm are welcome, but they do not have to be longer.

Finally, two shots of the Scan-Speak D2604 / 833000 or 830000 & the Peerless XT25TG30-04 with waveguide


You do the conversion on your own responsibility! I accept no liability. Possibly. you lose your warranty claims during the conversion.

I did a lot of conversions and nothing ever happened. I think the manual is pretty foolproof 🙂

The plans of the adapter plate are the intellectual property of, Alexander Heißmann. Any transfer requires my express consent.

... coffee is available from 1 € 😉

Test Peerless / Tymphany XT25TG-30 / 04 (XT-300 / K4) at the waveguide WG-300 / PCT-300 4 Ω ring emitter with waveguide

Datasheet ©
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.


XT25TG-30 / 04 Sound pressure at angles

Vifa XT-300 (XT25TG-30 / 04) WG300 Sound pressure at angles

System-induced overshoot in the frequency band of 1-7kHz. This can be due to their symmetry very easy to equalize with the crossover. It is the purpose of a sound guide to act as an acoustic amplifier. This results in a more uniform bundling and higher load capacity. The Vifa XT-300 (XT25TG-30 / 04) fits perfectly with the waveguide. Extremely uniform bundling without significant disturbances. Due to the large dome (30mm voice coil) slightly stronger directivity from 8kHz.Recommendation: On the axis a slight increase> 8kHz in the tweeter schedule.

XT25TG-30 / 04 Sound pressure standardized at angles to 0 °

Vifa XT-300 (XT25TG-30 / 04) WG300 Sound pressure normalized at angles

Vifa XT-300 (XT25TG-30 / 04) WG300 Sound pressure normalized at angles

Here, the frequency response was linearized on axis. The 2. Picture (sonogram) clearly shows the excellent uniform straightening behavior of the combination of XT-300 and the waveguide.

XT25TG-30 / 04 decay behavior

Vifa XT-300 at Waveguide WG-300 decay behavior

Minimal delayed decay by 2kHz. Otherwise perfectly.

XT25TG-30 / 04 harmonic distortions

Vifa XT-300 at the waveguide WG-300 harmonic distortion

As expected, the distortion decreases compared to the variant without waveguide. The XT-300 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.


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


The Peerless XT25TG-30 / 04 and the Waveguide WG-300 are a highly attractive combination for extremely low-level installations, eg in home cinema. Can be used already from 1,5kHz. I think I'll test that in Cinetor.

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

Datasheet ©
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m
Vifa XT-300 (XT25TG-30 / 04)An exceptional tweeter, equipped with a 5mm strong front panel, 5-hole mounting and a "just beading" membrane.

Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) Sound Pressure & Impedance (Scattering)

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 average with 91,5dB / 2,83V on average. A copy has a higher resonance frequency by 20%, but this does not affect the intended workspace. Otherwise from 1,5kHz congruent course. Very good. With frequency response, you have to look very closely to see if they are 2 or 3 drivers. Practically congruent course from 600Hz.

Vlt. a little note at this point:

I do not buy 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) Swaying 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
Outstanding low distortion 3.order. From 1,5kHz <0,1% at all measured levels. The "good-natured" K2 increases relatively strong under 3kHz. A bit of "whitewashing" is thus incorporated. For separations> = 2kHz, K2 should still remain below the threshold of perceivability, 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 low-level combinations from 2kHz. At "normal" level requirements also lower.

Series dispersion seems to be a foreign word for the driver. Furthermore, his intended work area is far outside the design of tweeters, prone to series fluctuations region around the resonant frequency. It is usually not recommended in vain tweeter> = 2x FR to separate.

and all this for extremely cheap 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.

To the kit Samuel HQ