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 the 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.
measurements
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 ...
listening
It sounds balanced, sovereign and ready to do bad things when it comes to mean levels ... profound and dynamic bass ... discoloration-free mids ... The ring radiator ... unobtrusive and extremely smooth with a profound level of detail that only gradually draws attention to itself.
Conclusion
Clever driver combination, paired with perfect tuning, results in a box that does everything right.
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
measurements:
Frequency response on axis
Sum drivers & reverse null 15 °
Directivity horizontal 0-90 ° tweeter inside
Burst decay
Directivity vertical top 0 °, 5 °, 10 °, 15 °
Directivity vertical down 0 °, 5 °, 10 °, 15 °
Bass reflex ports Black: 2x open Blue: 1x open / 1x closed Red: 2x closed
Harmonic distortions. Gray line 1%. Graph switches every 3 seconds.
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
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 should not cause any problems. It doesn't even have to be measured 🙂 Let's go ...
Print out the PDF (included in the respective building folder) using Acrobat Reader (choose the “actual size” option!)
Size check: Outer diameter 120mm
Glue on a 9mm thick piece of MPX / MDF / screen printing plate (spray glue / glue stick ...)
Drilling the holes => upright drilling machine 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 additional tip from Thorsten (www.felbi.at)
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.
Installation
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, use a large slotted screwdriver to "pry" it up discreetly as shown in the following picture. Work slowly and evenly. The screws on the front panel should of course have been loosened beforehand (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).
Finally, two recordings of the Scan-Speak D2604 / 833000 or 830000 & the Peerless XT25TG30-04 with waveguide
Disclaimer
You do the conversion on your own responsibility! I accept no liability. Possibly. you lose your warranty claims during the conversion.
I made a lot of changes and nothing ever happened. I think the instructions are pretty "foolproof" 🙂
The plans of the adapter plate are the intellectual property of Heissmann-Acoustics.de, Alexander Heißmann. Any transfer requires my express consent.
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
System-related exaggeration in the frequency band of 1-7 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 XT-300 (XT25TG-30/04) 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.
XT25TG-30 / 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 XT-300 and the waveguide.
XT25TG-30 / 04 decay behavior
Minimal delayed decay by 2kHz. Otherwise perfectly.
XT25TG-30 / 04 harmonic distortions
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.
Rating
Frequency response / directional behavior:
Range:
Power handling:
Constance / Without Rating /:
Haptics:
Price-performance:
Conclusion
The Peerless XT25TG-30/04 and the Waveguide WG-300 are a very attractive combination for extremely level-stable installations, for example in the home theater. Can be used from 1,5 kHz. I think I'll test it out in Cinetor.
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.
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.
Rating
Frequency response / directional behavior:
Range:
Power handling:
Consisty:
Haptics:
Price-performance:
Conclusion
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.
An extraordinary tweeter, equipped with a 5mm thick front panel, a 5-hole attachment and a "bead only design" as a membrane.
