I have the Shaker 500 sound system....I know, I should replace it but it is good for now. I'm thinking about adding a Collins bass tube in the back. Will it work? Does it have a plug in the back of the radio for additional speakers? I had the bass tube in my box truck but when I sold it, I kept the bass tube. It puts out a nice base sound.

 

No additional wiring back there for adding anything audio, you'd have to add it all,
splice in. The remote turn on lead is there too, but it's only 5V.

You can splice into the factory SUB output and run it back to an amp, for whatever
sub(s) you want to add. The rear speaker leads don't have the same bass signal
as the subwoofers.

I'd use a factory shaker 1000 trunk subwoofer enclosure, and a seperate amp. All the
mount holes are back there, so you can make it nice and neat.