Hi Captain,

It's possible, but extremely unlikely. Is the sub from a specialty subwoofer manufacturer or is is a home-built job? Is it specified to 25Hz + or - so many dB?

I don't think it would be nearly as linear--as consistent--in its frequency response as an Axiom EP350 or Hsu product. There have been a lot of advances in subwoofer enclosure and driver design since the '70s.

Regards,
Alan

Alan Lofft,
Axiom Resident Expert (Retired)