ATH Gen2 Waveguides

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What follows are assorted acoustic measurements gathered during the development and testing of the Gen2 waveguides.

Important notes:

Note 1: The indicated absolute pressure levels are NOT the actual levels and not even comparable between different graphs - the SPL scale is not calibrated, nor were the driving voltage levels held exactly the same for all the measurement sessions. This means that the graphs below display only the shapes of the raw frequency responses of each individual driver tested in combination with a particular waveguide and throat adapter. No further processing (e.g. EQ) has been applied.

Note 2: These are only quick informative measurements, typically sampled for off-axis angles roughly between 0° and 30°, with 10° step, but the exact values may differ slightly between different sessions. It is not necessary to measure the whole radiation pattern each time, as the match between a BEM simulation and the actual measurement is very good in general (see e.g. this diyAudio post) and the directivity is substantially independent of a driver used. The measurements have been all done indoors in a limited space, gated with 4.5 - 5 ms time window.

Compression drivers tested:


1"
Peerless DFM-2535R00
Lavoce DF10.171K
RCF NDX595
Faital HF108
B&C DE360
B&C DH450
Peerless DFM-2544R00

1.4"
SB Acoustics ROSSO-65CDN-T
BMS 4554
18Sound ND3T




Peerless DFM-2535R00
A520G2 / T520-25-STD-1


Peerless DFM-2535R00
A520G2 / T520-25-EXT-1


Peerless DFM-2535R00
A520G2 / T520-25-STD-3



Lavoce DF10.171K
A520G2 / T520-25-STD-1


Lavoce DF10.171K
A520G2 / T520-25-STD-2


Lavoce DF10.171K
A520G2 / T520-DF10-171K (matched adapter)


Lavoce DF10.171K
A520G2 / T520-25-EXT-1



RCF NDX595
A520G2 / T520-25-STD-1


RCF NDX595
A520G2 / T520-25-EXT-1



Faital HF108
A520G2 / T520-25-STD-1


Faital HF108
A520G2 / T520-25-STD-2


Faital HF108
A520G2 / T520-25-EXT-1



B&C DE360
A520G2 / T520-25-STD-1



B&C DH450
A520G2 / DH450 adapter



B&C DH450
A520G2 / T520-25-EXT-1



Peerless DFM-2544R00
A520G2 / T520-25-STD-1



SB Acoustics ROSSO-65CDN-T
A520G2 / T520-ROSSO-STD



BMS 4554
A520G2 / T520-36-STD-1



18Sound ND3T
A520G2 / T520-36-STD-1




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Marcel Batík, 2024