Bridged or Parallel 100w LM3886? - diyAudio
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Old 2nd March 2009, 06:43 AM   #1
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Default Bridged or Parallel 100w LM3886?

So I'm gonna build the PA100 or BR100 off this datasheet:
http://www.national.com/an/AN/AN-1192.pdf

I can't find much on which to choose though. Any strengths or weaknesses I should consider?

Thanks!
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Old 2nd March 2009, 07:08 AM   #2
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If you don't even read the first page of that document, don't build either.

Bridged for 8 Ohm speakers. Parallel for 4 Ohm speakers.
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Old 2nd March 2009, 05:07 PM   #3
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Hate to put a question that sounds a bit 'wise guy' kinda question, but what is suggested when the average impedance of the speaker is 6ohm?
bridged parallel setup?

Thanks
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Old 2nd March 2009, 06:23 PM   #4
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Parallel for 6 Ohm.

The ICs are specified for 4 to 8 Ohm loads. If you bridge them they 'see' half the impedance. A 6 Ohm speaker would mean a load of 3 Ohm for each IC, which is too low.
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Old 2nd March 2009, 06:26 PM   #5
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Makes sense, thanks
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