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Old 12th March 2016, 11:02 AM   #1
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Default "Semi" paralleling Class D?

Hi, please do not jump on me if the question is dumb, I'm new to what I try to achieve:

-I have the B&W 801M S2 loudspeakers and want to triamp them with an active crossover.
-The midrange and the tweeter share their negative lead even with the passive crossover removed.
-I could change that if absolutely necessary but would rather not as it involves emptying the loudspeakers to run an other cable up to the tweeter (might be a problem with the medium+tweeter assembly plug as well, do not remember if it is 3 or 4 pins..).

-So the question is: if I leave it that way and triamp, obviously no problem on the woofer side, but could the fact that the two amps in charge with tweeter and medium share the same "return" negative lead lead to problems?
-If I use Class D monoblocks, (nuforce 9v2) would that be an agravating factor? (if I remember well its negative is not at ground but plus 24v, and well it is behaving in a peculiar way electricaly..)

Thanks in advance!
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Old 12th March 2016, 02:47 PM   #2
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Doesn't sound like a good idea . There will be a voltage differential between the two amps negative outputs because of the different mid/high signals. It could possibly damage the amps. Not worth the risk IMO.

If you really want to avoid rewiring the speakers you need to use single ended modules.
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Old 13th March 2016, 09:19 AM   #3
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Thanks for the input, ok seems like either I rewire or I drop the idea of using my Nuforce and try it with some nice Class A single ended... I do have very nice Sphinx power amps lying around here (Sphinx project 12 and poject 18), I think these are Class AB and probably not single ended... not sure.. could somebody knowledgable check the circuit topology? -> Project 12 Amplifier Diagram - Sphinx Project Twelve Service Manual [Page 16]
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Old 13th March 2016, 11:07 AM   #4
wwenze is offline wwenze  Singapore
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How about single ended class D like IRS2092?

Or the Project 12, yea that's single ended class AB
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Old 13th March 2016, 09:55 PM   #5
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Ok, thanks a lot for checking!
Then I'll use the sphinx for midrange and tweeter.
Project 18 for mid, Project 12 for high.
Should be ok I hope electricaly speaking....?
And for now will throw in a nuforce for the woofer.
I expect that I'll have plenty of work to do on the crossover settings before it makes sense to go on on further refinements like amp matching.. ;-)
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Old 13th March 2016, 11:15 PM   #6
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Quote:
Originally Posted by kelleri View Post
Should be ok I hope electricaly speaking....?
Depends on how the amps are wired and grounded. Take a meter and measure between the two amps negative speaker outputs and make sure there isn't any major voltage potential. If there is, you might end up with some hum at the least.
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