This amp is divided into 2 section one for you door speakers and one for your subs . I already have two amps for my subs and i wanna use this strictly for my door speakers now , but can i use the channel that says sub woofer or is this going to be a problem??? Thanks i believe the output for the 2 channels is 85 watts @ 2 OHMS and 420 For da subs. Tell me what you think ???