Datasheet © www.heissmann-acoustics.de | |||||||||||||
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m | |||||||||||||
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Vifa / Peerless XT-300 K4 (XT25TG-30/04) sound pressure & impedance (dispersion) |
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. |
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Vifa / Peerless XT-300 K4 (XT25TG-30 / 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 XT-300 K4 (XT25TG-30 / 04) |
Extremely smooth and fast swinging over all frequencies. | ||||||||||||
Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) harmonic distortion![]() 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. | ||||||||||||
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