Installed 4 channel amp, only had 1 pair of preouts left after recent sub install. Plenty of bass from subs but no longer hearing any of my other speakers. Do I need
Subwoofer wiring diagrams
How to bridge amplifier channels - Car audio. - AudioControl
How To Hook Up A 4 Channel Amp To Front And Rear Speakers
How To Wire 4 Channel Amp 4 Speakers and Sub Diagram | PDF | Loudspeaker | Audio Engineering