[morgal48]

The factory Haes 6X40 amp has an internal low pass filter that cuts frequencies above 50Hz. 40W to the door subs essentially makes them paperweights. With a proper amp the sound from the two 5-1/4" subs in the doors will come alive. If your rear deck speakers are original, the paper cone part of the speakers will be in little pieces on the shelf deck. They are, it is said, for filler only. Howsomever, with the proper amp one can adjust the balance and make them more than filler. All eight speakers (2-ways now in the dash) provide great sound if I turn the CDR220 on.