I just bought a JCM800ZW and I'm running it into my Randall 4x12. I've set the amp to 16ohm to match the cab. I get sound but with the master and preamp at 8, I can talk over it. I've always heard how incredibly loud these things are, so either I've done something dumb in the setup or there's a problem with the amp. Edit: The Mains were set at 230V and when I changed to 110V, it's loud as hell at master volume at 2 but no gain at all. I was getting solid distortion with the previous mains setting...but I suppose that was due to the master volume being at 8. Hopefully I will be ok with an OD in front of it and a power soak. Any tips appreciated.