Ok, just got me a JVC headunit, 4v outputs for the front, rear & sub & a 12 disc CD changer. My 850 has the front speakers upgraded to Infinity components, in the rear doors are the standard 850 speakers, on my boot floor are a pair of infinity 6x9's powered by a sony 2x125w Rms amp, I have a Vibe 500w active sub in the boot (estate car), the front speakers are powered by the head unit as are the rear door speakers, id like to upgrade the front & rear doors to 'powered'.
Problem, I can use the 'front' output for the front doors, the rear doors id like to be powered by their own amp but don't want to split or share the 'rear' output front the head unit that's currently being used by the boot floor speakers/amp. how can I get 2 'rear' outputs without going 'passive'? Id like to keep the 4V output power.