You shouldn't go over the wattage of the amp. If the wood grain speakers with wall baffles are turned down far enough they would have a low enough wattage to not put the amp into protection. Not sure what the 8 ohm speaker is doing, or how it is working. (unless they are pulling some shenanigans with volts, ohms, and watts). You could possibly chain out of the amp, to another amp to run the new speakers leaving the old stuff alone. You could also put an amp in capable of running all of the things old and new.

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