Good question.... The answer is yes. The factory GM raido they have installed is a generic one used in several makes/models and they all have the same problom.. Also using the factory deck will (over time and at high level's) degrade the life of both amp and sub due to the "dirty" freq. being sent to it. Not to mention a few other bad things that can possibly occur because of it.good point, but I was wondering if it were the radio that turned down the bass and not the amp... "Because the radio has the auto EQ and VOL level"