In my TSX, I had a 10 inch sub and 4 channel amp that sounded incredible with the stock speakers. The installer had two channels bridged to power the sub, and the other two channels went to the front L/R speakers. The back seat door speakers were powered by the stock amp. The stock bass speakers were disconnected.

Any chance this can be done with the new TL?

are there too many speakers in the TL for this to be done?