If it's a single-ended, common-ground amp, then yes, that would be close.
Push-pull (bridged) amplifiers double the voltage for quadruple the power(around 20W RMS per channel), and these are the most common now, for both OEM and aftermarket. Only the really cheap aftermarket units are still using a common ground setup.
Push-pull (bridged) amplifiers double the voltage for quadruple the power(around 20W RMS per channel), and these are the most common now, for both OEM and aftermarket. Only the really cheap aftermarket units are still using a common ground setup.