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In Reply to: RE: Distortion reduction in H-frame ... posted by Davey on March 24, 2017 at 11:42:57
Thanks for the clarification, Dave. Isn't it also true that harmonic distortion is less perceivable at bass frequencies than at higher ones? On the question of force cancellation, I imagine the H frame and the mounting of two woofers on opposing baffles and wired in opposite polarities (Seaton Submersive, for instances) in a sealed sub provide about the same degree of opposing force cancellation and harmonic distortion reduction, all else being equal.
Follow Ups:
The Seaton Submersive is a sealed-box design with opposing woofers wired with opposite polarity??
What's the point of that????? To shake the woofer box all over the floor and not generate any bass??? :)
Dave.
It is just a bipolar sub. Not a self cancelling construct.
Now I get it---the two woofers in the Submersive are wired in same polarity, which I think I use to know! Demonstrations of the sub have included a coin being set on edge on the top of the enclosure, the coin remaining motionless, proof of the benefit of apposing woofers. It was THAT that was the point of my query---is a reduction in harmonic distortion one benefit of Seatons design. I don't think Seaton makes that claim, instead focusing on the design resulting in less enclosure resonance.
Edits: 03/26/17
A bipolar sub with two drivers at opposite ends IS a force-cancelling construction.
Do you understand the concepts involved with these types of double-woofer schemes???
Dave.
Yes, force cancellation on the geometrical on axis vibration transferred by the structure, not cancelling the acoustic output, which is what I presumed you were referring to..
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