I now hav a problem with my pioneer amp, it is a GM-6000F and i cant run it in 4 ch mode for som reason...iv got my 12" sub hooked up to it(bridged) and i wanted to hook up my 2 6x9"..but it wont let me play the 6x9"s properly (only one works properly but the other just pumps bass and thats all) and thats when its on 2 channel lol, when its on 4 ch the only bass 1 dont work at all!!!..my pioneer HU (DEH-1850) only has 1 set of pre-outs and i was wondering is there ne way i can hook it up so it will work..i also dont hav the manual for the amp so that dont help...but yea it's pi$$in me off..