So far i have four speakers, my 2 front are the one that came with the car, my 2 rear are new one pioneer 5 ways 80w rms. Therefore i have set them to 4 out of 15 (to give priority to my rear speakers), but If i only leave my front speakers (+15 to front), that will NOT allow my subwoofer to sound, ONLY if i have my rear speakers on in the fader control. Is that normal?
by the way my amplifier is a two channels, but it's bridged for only one channel (i have only one subwoofer), and the amplifier is connected to the rca connectors in the HEADUNIT.
it is being controlled by the fader, it has nothing to do with power, your changing from front to rear, just set your radio back to equal of the fade and leave it alone, or buy another radio with 3 sets rcas. front ,rear and sub.