Yes, door speakers are supposed to be sub woofers, but produce little or
no output in bass amp mode, but, if I jump two wires off the dash
speakers, the door speakers play loud and clear,... but this is not the
active bass (sound separation) mode, I think in fact I just by-passed
the trunk mounted amp. "Benz" says amplifier failure is very rare
and to look elsewhere......any audio people out there?