ADA Power Amps > B200s

Marshall Cabs

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Mxzx:
I just got a B200s off of Ebay, and was wondering if I can run two 16 ohm 4x12's through it?  I don't have the manual for it, but seller says it can do 100w into 8 ohms, or 135w at 4 ohms?  I do have a JCM-900 that has the stereo switching in the back that I think brings each pair of speakers to 8 ohms, so I can always to do a single cab.

Thanks

rnolan:
The B200s does about 124w rms into 4 ohms and probably about 80w rms into 8 ohms.  You'll do damage if you use a 16 ohm load.  It will pair well with the JCM-900 in stereo with each pair 8 ohms.  You can re wire the 16 ohm cabs to be 4 ohms or run both in parallel off one side of the B200 (ie 16 + 16 in parallel = 8).  4 x 16 ohm cabs are typically wired with each pair in parallel and then the series between the 2 pairs = 16 ohm box (or each pair in series and parallel between the pairs).  If you change the wiring to be all parallel  16 + 16 + 16 +16 = 4 ohm.

Mxzx:
Cool, thanks for the info.

I think I'll just run it into one -900 cab in stereo.

rnolan:
Sounds good  :thumb-up:

MarshallJMP:
You can use 2 16 ohm cabs if you want,won't harm a thing,just the power will be lower.Around 50-60W /side.

JCM900 cabs have either mono 16 or 4 ohms input or  2 x 8 ohms stereo.Are both cabs JCM900 models?

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