|Datasheet © www.heissmann-acoustics.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 (0-90 ° in 15 ° steps)
|Due to the waveguide system-related symmetrical elevation in the frequency band of 1-10kHz. This can be easily leveled with the crossover.
The Vifa Peerless XD-270 / F4 goes perfectly with the waveguide WG-300. 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 2-18kHz 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 so-called Constant Directivity.
Sound pressure standardized at angles to 0 °
|Minimal delayed decay by 2 and 20kHz. Otherwise perfectly.|
|The harmonic distortion of the XD-270 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.
The Peerless / Tymphany DX25TG09-04 on the Waveguide WG-300 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.
4 thoughts too "Test Peerless DX25TG09-04 (Vifa XD-270 F / 4) at Waveguide WG-300 4 Ω dome tweeter with waveguide"
I always had deviations in the result of 270kHz when measuring the Vifa XD-9.
After initial ambiguity of what caused this, I finally came to the conclusion that it is a temperature-dependent behavior.
Metrologically recorded below:
(0 and 45 °. Blue 25 ° C Purple 10 ° C Room Temperature)
The behavior is also evident in the Vifa / Peerless XD-270 without waveguide. There is probably a resonance at 9kHz, which reacts sensitively to the (temperature-dependent) rigidity of the bead / membrane.
In my opinion, not a problematic, but worth mentioning "problem".
great tests, thank you.
Visaton has relatively large waveguides with a square cross-section. Practical in the idea, because they scatter in the horizontal rather than in the vertical, thereby relatively less reflections on wall and floor.
By feeling, however, I mean that the big ones belong in their own housing, because otherwise they will not hold the pressure of the TT.
Would be great if you could measure these WGs, and in the other also publish before / after tests for comparison, because all measure differently.
It would be nice if you could specify the duration of the "baffle", so that a term of construction can be planned.
Best regards, Mat
Hello Mr. Eller
Which waveguide do you mean? A link would be nice.
As you mean the WG148 ... I have very successfully combined this with the Seas NoFerro-900.
I do not mean that "all" measure differently. I measure under quasi-free field conditions and known baffle. In my experience, measurements of different developers / magazines can usually be compared very well.
My measurements should not be used as a basis for developing speakers, but to provide an estimate in terms of quality and applications. So I do not see any sense in specifying the maturity. Anyone who has developed this information automatically with measurement technology. Developments without measurement technology are in my opinion not effective.
Best regards and thanks for the suggestions.