Sumo "The Power?"

i need more information about my amplifier. if anyone knows any details such as the instruction manual or what its worth.
Go to and Email James Bongiorno.

He is the designer.
Another person you can contact is Michael Bettinger and Mike is a great guy to work with and knows GAS and Sumo amps really well.

You could also ask David from for assistance.

His info has a lot of info about Sumo, GAS etc etc. I've corresponded with David in the past and he was really nice about questions.

Good luck with the search.
Not sure which model on the sumo line you have, but i have the link to the service manual for the Nine plus. (in case you need it)