2003 suburban, stereo ideas

I have a 2003 1500 Suburban 5.3l with stock bose sound system and 6 CD player deck. The system sounds great and the deck works just fine but not enough bass for me. Is there any setup I can try without having to go all out replacing everything? Possible to add sub without buying a new deck and will it sound alright? Just curious, any ideas would help.

Where did you get the 4x9's...?

1991 Camaro RS

JVC KD-AR300 4x9 MTX Dash 6x9 MTX rear 2 12" MTX Thunder 8000's

M.E.C.P & First-Class

Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

You can use a "line out converter" to add a subwoofers to your system. A single 12" in a vented box should be plenty enough bass. Around 400W RMS. Unless of course you want to shake the cars next to you....

They are 4x6, I haven't signed in here since the day I registered. Didn't notice the mistake.