Behringer Pmp3000 16 Channel Audio Mixer Logo
Posted on Nov 18, 2010
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If I'am powering 2 Peavey 4 ohm bass binns, then linking, from the base bins, 2 15" 4ohm cabs, should my selector switch be in main L and R mode ,or Bridge mode for maxium output and performance, thanks, John

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Fred Yearian

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  • Behringer Master 5,603 Answers
  • Posted on Nov 19, 2010
Fred Yearian
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You CANNOT power 4 total 4 ohm speakers from this unit without special configuration. The lowest you can go is 4 ohms per side, which would be one 4 ohm cabinet per side. You would have to do a series parallel arrangement with the resources you have... two Peavey's in series and that combination in parallel with two 15's in series...
This is a VERY unsafe configuration with this mixer. ALSO please read my tip on here in regard to PMP mixer grounding hazard of the A channel when using Speakon to 1/4 inch cables.

Frankly, forget about maximum performance unless you want to risk blowing your mixer...

If I were you, I would put the two 15's in SERIES as 8 ohms on one of the channels and the Peavey's in SERIES as 8 ohms on the other channel.

You would be well to heed this warning as I have repaired a bunch of these units. Be careful of any poor speaker connections as there is an insulation breakdown problem in the power amp circuit board if a speaker becomes intermittent. If something fails DO NOT replace the pwer fuse as you will do more damage.

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