https://www.soundstagenetwork.com/i...i-audio-spk5-loudspeakers&catid=77&Itemid=153
This is a speaker design that Purifi has the free plans for on their site:
https://purifi-audio.com/tech/
I see that @sgoldwin sell these on his website for $2830 USD shipped:
https://celuaris.com/products/celuaris-spk5-loudspeakers-featuring-purifi
Both drivers have been measured by HiFiCompass:
https://hificompass.com/en/speakers/measurements/purifi/purifi-ptt65w04-01a
https://hificompass.com/en/speakers/measurements/mundorf/mundorf-amt21cm21-c
Please note that measurements are only anechoic above ~100Hz.
0/15/30 H:
Some peaking around the 3200Hz crossover, but other than that it’s pretty flat. It does have a very low sensitivity of 82-84dB though (they calculate 82dB from 300Hz-3kHz, but on the listening window).
45/60/75 H:
This is something I don’t understand. We see a narrowing of directivity starting at ~500Hz, however the measurements of the woofer show it doesn’t start to lose directivity until ~1500Hz. But looking at the Purifi documents, they too show a narrowing of directivity at 30°. I have no clue why this is happening, and maybe that peaking at the crossover region is intentional in order to better match the woofer and tweeter for the Sound Power, or else at 3200Hz the woofer’s SPL would have been much lower off-axis.
Listening Window (different than Spinorama, +/-15° H & V):
Flatter than 0°, so not sure if the tweeter axis is not the reference axis, or it is and those non-linearities vanish quickly vertically.
THD @ 101dB (measured 96dB @ 2m):
This is nothing short of amazing, besides the blip around 400Hz, you almost see no distortion in the graph >100Hz
This is a speaker design that Purifi has the free plans for on their site:
https://purifi-audio.com/tech/
I see that @sgoldwin sell these on his website for $2830 USD shipped:
https://celuaris.com/products/celuaris-spk5-loudspeakers-featuring-purifi
Both drivers have been measured by HiFiCompass:
https://hificompass.com/en/speakers/measurements/purifi/purifi-ptt65w04-01a
https://hificompass.com/en/speakers/measurements/mundorf/mundorf-amt21cm21-c
Please note that measurements are only anechoic above ~100Hz.
0/15/30 H:

Some peaking around the 3200Hz crossover, but other than that it’s pretty flat. It does have a very low sensitivity of 82-84dB though (they calculate 82dB from 300Hz-3kHz, but on the listening window).
45/60/75 H:

This is something I don’t understand. We see a narrowing of directivity starting at ~500Hz, however the measurements of the woofer show it doesn’t start to lose directivity until ~1500Hz. But looking at the Purifi documents, they too show a narrowing of directivity at 30°. I have no clue why this is happening, and maybe that peaking at the crossover region is intentional in order to better match the woofer and tweeter for the Sound Power, or else at 3200Hz the woofer’s SPL would have been much lower off-axis.
Listening Window (different than Spinorama, +/-15° H & V):

Flatter than 0°, so not sure if the tweeter axis is not the reference axis, or it is and those non-linearities vanish quickly vertically.
THD @ 101dB (measured 96dB @ 2m):

This is nothing short of amazing, besides the blip around 400Hz, you almost see no distortion in the graph >100Hz
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