sub-woofer pulsing sound no kick bass i purchased my 1988 fiero gt with an aftermarket sony cd/radio it has the over head sub-woofer slider when i play the radio it makes a low pulse sound what the hec is that all about??? please help i am pissed off the 2 wires that was connected to the sub was disconnected when i connected it thats the sound it gave so i took the factory sub out and it was all dry rotted i bought a new 5 1/4 inch sub 4 ohm and hooked the sub up with no luck same noise

I suspect it is wired wrong. Whoever installed it used the 12v antenna to run the sub woofer. Not enough juice through that circuit to power the sub. You need to get 12v from somewhere else, preferably through a relay. Last one I did pulled power from the fuse box and used the antenna circuit to engage the relay.