My cello-playing wife and I play weddings, usually using a Bose L1 compact or a 30W UltraSound if only the classical guitar needs a boost. Sometimes, power is hard to come by in outdoor locations. Since we already have amps, spending $700 on a 3-channel portable seemed a bit much, so I picked up a 250W rechargeable battery generator with a "pure sine wave inverter." It worked ok with the 30w amp, but once I added the mixer and plugged in the mando (phantom power) and guitar, it created an incredibly loud buzz through the guitar channel (using a Kremona piezo on the bridge). I didn't even get to the point of adding the cello.
Has anyone else tried this approach, and what did you do to make it work?
Thanks.
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