Nominal Vpp amp output across home theater speaker exceeds 100V - Page 2 - diyAudio
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Old 18th June 2017, 11:27 PM   #11
diyAudio Member
Join Date: Sep 2014
Location: suburbs of Houston
Default BTL time

Thanks for all the help!

I guess I never really thought about (or maybe I did and forgot!) exactly how bridging an amp (especially a fully balanced one) increases max potential across the speaker, effectively doubling the rail voltage. In my case bridging would basically double the rail capability, which would be inside my (observed) test (with ~28% margin vs clipping on transients at very high volume). I was thinking (incorrectly) referenced to ground that the most any topology could do without a fast switching-mode would be a Vp limited by the rails. But, of course with BTL the "ground" (negative) side of the speaker is moving too WRT amp "ground".

I agree a discrete design would be more traditional and... maybe cheaper? I may go that route later, although what with so many assets in the Class D world now available and so much commercial effort in that direction maybe I would go that way. However I had originally planned to BTL/parallel the device anyway and I already bought a crap-ton of LM3886's (I have 8 more unused isolated and... wow just counted, um 17 non-isolated! I'm not sure where all those came from).
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