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Old 21st July 2015
  #3005
Gear Head
 

Quote:
Originally Posted by got_degree View Post
Where do they state "-3dB"?
I can only find "Usable Frequency Response" and that can mean anything. -10dB is also usable.
PMC's also rely on a transmission line, that can boost the low end output significantly, but at the cost of group delay.

So even though I doubt the PMC can deliver clean usable output at 33Hz, it is at least possible.

The Audiofilia concept (mechanical oscillation to generate a “hybrid waveguide” of pneumatic nature) is pure pseudoscientific BS.
Yes , you're right. Description on PMC's page was my mistake. By "usable" in a professional range It should mean that the speakers have to reproducing a very few decibels of tolerance. BTW, If it's written -10 at 33hz / i guess measured in anechoic chamber/, it's not impossible to reach 33 hz at -3 db negative with support from an acoustic interactions.