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Old 22nd October 2008, 03:47 PM   #1
ryan750 is offline ryan750  Philippines
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Join Date: Oct 2007
Default parallel lm3886 question

if i parallel 4 lm3886 driving a 1ohm load, then each ic would see a 4ohm load, am i right? what would be the disadvantages of this compared to bridge/parallel (BPA) config

another question,
what would be the best way of wiring a DVC sub, 2ohm each VC to 4 lm3886

1. wire the sub in parallel resulting to 1ohm impedance powered by 4 parallel ic, each seeing a 4ohm load

2. parallel 2 LM3886 and wire them independently into each 2ohm VC

3. the BPA200 config

any suggestion would be gladly appreciated, thanks
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Old 22nd October 2008, 06:35 PM   #2
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Join Date: May 2008
Default Re: parallel lm3886 question

Quote:
Originally posted by ryan750
if i parallel 4 lm3886 driving a 1ohm load, then each ic would see a 4ohm load, am i right?
Yes.

Quote:
Originally posted by ryan750
what would be the disadvantages of this compared to bridge/parallel (BPA) config
None. BPA would need higher speaker impedance or you would have to parallel several BPAs.


Quote:
Originally posted by ryan750
what would be the best way of wiring a DVC sub, 2ohm each VC to 4 lm3886

1. wire the sub in parallel resulting to 1ohm impedance powered by 4 parallel ic, each seeing a 4ohm load

2. parallel 2 LM3886 and wire them independently into each 2ohm VC

3. the BPA200 config

any suggestion would be gladly appreciated, thanks
Your choices 1 and 2 make little difference. The advantage for version 2 could be that you share the current across two speaker cables, so you can use a smaller wire diameter.

The BPA configuration can only drive 2 Ohm loads with a low supply voltage, and should better not be used below 4 Ohm.

How about wiring the voice coils in series? That gives you 4 Ohm and you could even try to work with a single IC. If you want to use more power, this is the configuration where you can use BPA.
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Old 23rd October 2008, 09:37 AM   #3
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
wire the DVC in series to give an effective 4ohm load.

Then decide whether you want the complication of BPA200 or BPA300 or simply go to discrete for your amplification.
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regards Andrew T.
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