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thanks
if there is a RCA for sub, does it mean that the freqence from it has already been fixed specificlly for sub? thanks

thanks for reply.
just one more thing.
where is sub output from, I mean usually a HU has 4 thennal two for front and others for the rear, is the sub output same to rear output?

my question are 1) Does the RCA sub output from a HU have left and right?
2) Is the 4V preamp output stronger than the 2V or there are some other meaning?

thanks guys

thanks but if I don't have the RCA for the sub(just have the rear), how can i set my sub?

thanks

just one more thing, on a 4 ch amp, there are front input and rear input. Do I need to split the rear RCA from the head unit in to two, in order to plug both front and rear input on the amp. ( cause I want to use this amp to power my rear speakers and one sub and leave the front speakers for the HU)...

thanks for help guys

How many crossover does a 4 chennal amp have ( if it says build with internal high/low crossover) ? I mean, is there a one for each chennal or just one which control every chennal. I am going upgrade my audio ( first time), thinking to buy a 4 chennal amp, two chennals for the rear speakers and anth...