How to wire my 4-ch as 3-ch

[fb111a1 10+ year member]

Sorry if this seems like a stupid question but I just don't to mess anything up. I have a CDE-HD149BT headunit and a MRP-F240 4-ch amp. I am currently running my fronts on 2 channels and I want to use the other two channels for a sub. The headunit has 2 sub-preouts.

Thanks

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[garychoffmann 10+ year member]

You just bridge channel 3 and 4 to your sub.

 

[pickup1 5,000+ posts]

Front RCA in front,sub into rear...wire sub, left (+) right (-)...on the amp terminals..

 

[fb111a1 10+ year member]

Thanks. That was pretty easy. Sorry to steer this in a totally different direction but.... I've found a JL Audio 250/1 to run my sub and I am thinking about bridging the Alpine to the two fronts. The speakers are Polk MM651. Would bridging degrade the sound quality at all? I am looking for the best sound quality possible, not necessarily the loudest system.

 

[T3mpest 10+ year member]

not really. Technically your going to increase the distortion from the amp, but you will NOT hear it. Amp distortion is always very low unless the amp is clipping. Bridging the amp will give you more power and make you much less likely to clip as well as increase dynamic range. Go for it.

 

[pickup1 5,000+ posts]

Yes,more power to the fronts...just hope my small jl will be enough for your sub.