High Efficiency Speaker Asylum

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Yes, I am aware of that 'problem' FREDs are very low distortion.

Posted by Timbo in Oz on April 14, 2017 at 15:55:22:
I have always thought that 63s and later small models need to be filtered and given subs. Between 100 and 150Hz. When you do that diaphragm excursion is quite limited.

Tom Danley (aka TomServo) agreed with my proposal following.

Ist order HP and 3rd order LP @ 150hz. Because using 4 monopole subs* in a swarm arc at the same listening distance. When the diaphragm excursion ceases to be a problem, and the room-gain totals relatively smooth at the listening seat. Lots of amplifier power needed for the bass.

That's what I am slowly building, on a limited monthly of <$ Au 400 budget. Dipole subs are way out of my budget.

* two large push-pull sealed subs as stands, and two tall EBS (Rb) subs to the inside of the QUADs corner edge on and 2nd HP filtered down below pedal reeds.

I'll use a bit of Eq if needs be, and later go with DSP as funds allow.