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I saw that Kale recommended not even running rear speakers. If this is so than would there be any disadvantage to running components on the front channels and then bridgeing (sp) the rear channels into my sub, of course on a 4 channel amp.
That should work fine. If you have seperate f/r inputs to the amp, use them, then you can use the fader on the head unit to get the right balance between the sub and main speakers.
Also note you will need some sort of low-pass crossover for the sub, hopefully your amp will have this built in.
If you want to run the rear speakers, you can still just power them from the head unit (if it has speaker outs), ideally the rears should just be used for fill, you want to fronts to be the dominant sound.
rear speakers hurt imaging. Rear speakers when inferior speakers will still play the music in an inferior way which youll hear while listening to the superior music.
I saw that Kale recommended not even running rear speakers. If this is so than would there be any disadvantage to running components on the front channels and then bridgeing (sp) the rear channels into my sub, of course on a 4 channel amp.
The only problem is that when your subs hit, it will drain available power for the components. You would probobly be better off get two 2 channel amps. Or a two channel and a mono sub amp. That way the bass will not be sucking away power that the components need.
No problems. As long as the amp is designed to handle the power load, and as Waco said, you have ample power being supplied, you should be fine. If you have a problem with the sub draining the amp of power and it hurts the seperates, add a cap and that should solve most of the issue.
On most 4 channels are you able to set low pass and high pass independently for atleast two of the channels?
I haven't seen many like that...usually you do a tri-way setup on two channels...basically a passive crossover for the subs/components but this adds distortion and the pahse will be slightly off at the intersection of the subs and the components, which could lead to phase cancellation. I would still get either 2 2 channel amps or a 2 channel and a mono sub amp...the sound quality will probobly be better with either of those setups vs. a 4 channel amp.
If your head unit can do it, use the crossovers in it. I don't know exactly which HU you have, but I assume it has a set of non-fading preouts and digital filters. Usually these digital filters take care of phase cancellation problems for you. They have high-pass filters on the front and rear preouts and low-pass on the NF preouts. So run your front preouts to the front channels of the amp and front speakers and run the non-fading preouts to the rear channels of the amp and your subs.