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In a previous thread I started about amp/sub/speaker relations, I got lots of answers that talked about bridging two channels of a 4-channel amp and using the other two to power the fronts, then leaving the rears alone. I'm having a JL 300/4 put in soon, and running it to all 4 speakers, no sub as of yet. If I do sub, it's going to most likely be a 12W3 powered from its own 250/1. Does anyone have a separate amp setup like this, and if so your thoughts/opinions, etc? I wasn't real sold on it at the start of the discussion, but because I like clean and clear and not offensively loud sound I decided to just amp all 4 speakers and leave the option open of the separate sub.

 
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I would say most of the people posting in this forum have a 2/4 channel for the speakers.
My suggestion would be to leave the rears powered form the head unit, and give all that power to your fronts, especially if you have comps. I wouldn't bridge the fronts but bi-amp the fronts, or even run an electronic crossover with that amp.

 
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I have just my fronts amped off of a 2 channel, and then a seperate amp for my sub box. I love the way it sounds, and the people who have listened to it say it sounds great.

 
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I'm running the JL Audio 300/4 with JL Audio XR 6.5"s in both the front and the rear and I love the way it sounds.

 
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i am runnin a 4ch and a 1ch it sounds great. just make sure your 4ch has the power you want otherwise its just not worth it.

 
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I just bought a Kenwood KAC-8401 4-channel amp for my speakers. Its got I think 60w RMS x 4, so that should be ample for my Alpine S-series speakers. Also got 2 JL 12w0s in the rear running from a Sony 400w RMS mono amp.

 
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Me run 4chan and 2chan, 4chan to all 4 insides, and 2chan to the sub.Me like!

 
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i run 2 channel to front speakers from 1 amp, and i have another one for my sub, but not like its important, but it sounds really good.

 
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I run a 4 channel 125x4 biamped to my front components and two monoblocks for my subs...it sounds great.