Aftermarket Amp and Sub

[mcs]

Hi guys,

Interesting question, Wile my car has the BOSE system, my mates has almost zero options fitted and keeps blowing the tiny sub the base sound system has.

He wants to fit an aftermarket sub to his car, I had the idea of using the TV AV outputs to go to the amplifier.

Can any of you who are familiar with the way this stuff works, be able to confirm its possibility?

Mike