"This is the only 8" pro midrange I've ever tested. Very unique driver that reminds me of the previously tested 18Sound 6ND430 in some ways. There is no copper in the motor and inductance is relatively high, however low non-linear distortion is likely obtained through motor strength and heavy saturation of the magnetic gap. Nice midrange driver though there are some serious usage limitations. Off axis of an 8" midrange droops very early and shouldn't be used above 2kHz. The driver is rated at 2mm of Xmax, though the flat foam suspension likely becomes a limit even before that 2mm is used up. For people using this mid, I'd recommend full featured excursion simulations to be sure that low end is not being over worked. That means excursion simulations done with a filter in place."
phl 2521 from Zaph|Audio
Thank you for posting this! I've been to Zaph's website several times but never realized he had measured a PHL.
For my intended purpose, used from 400 to 2000 Hz looks pretty good, doesn't it? Very, very low harmonics level at about 50dB below the fundamental. Impressive.
I wonder why we don't see more comments about PHL when midrange drivers are discussed.
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