Motional feedback in speakers
No surprise at all, back in the day when tube-based amplifier damping factors were somewhere between 10 and 15 on a good day with a tailwind, and acoustic suspension was uncommon. The 'cure' for tubby bass would be some choice between a stiffer spider, stiffer surround, smaller magnet, shorter excursion, any or all.
Seems overly complex - and I can see where it did not last long, or penetrate past a very few makers. By the way, Philips speakers were "active" speakers, needing only a pre-amp input.
Peter Wieck
Melrose Park, PA
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