Peavey XXX 4×12 Cabinet

Posted: August 18, 2015 in Modification, Speakers
Tags: , , , , , , , , , , , , ,

Peavey XXX RewiredI rewired my cab to have top and bottom pairs, instead of left and right.  I run it 2×12 once in awhile and wanted to try it this way.  The top pair is a little tighter and the bottom is about like normal.  I thought this would be a good opportunity to explain the wiring and source impedances needed for this cabinet.  It is a 16 ohm mono and 8 ohms for each side in stereo.  The diagrams shown are actually the same as stock, since the pairs are only moved to different locations.

Ex:1 A single amp in stereo needs to use 4 ohm output jacks to have a safe match.  The amp adds the outputs together to make 8 ohms.

Ex 2: A single amp in mono needs to use a 16 ohm output jack, but an 8 ohm output would still be safe, if your tube amp can handle it..

Ex 3: Two amps into one stereo cabinet use one 8 ohm output jack from each.  Because the loads are being seen by separate amps, they don’t reduce to 4 ohms, like would happen with a single amp running parallel loads.  The cabinet is basically two 2x12s in one box when used this way.  If one source amp is removed from the third example, an 8 ohm connection into one pair of speakers is using the cab as an over sized 2×12.

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