4 channel amp

[VinceGulino 10+ year member]

Quick question, I have a hifonics 4x45 amp laying around and I was wondering if I can use it to power a subwooofer. If i could, would that mean I would be sending out 180 watts to the sub?

Thanks

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[Polecat 5,000+ posts]

give or take...yea...

 

[VinceGulino 10+ year member]

cool, so I would just have to hook one wire up and the amp knows to give that one channel all the juice?

 

[alphakenny1 10+ year member]

hold on, you can't use all four channels to power to one sub. what you can do bridge two channels and you will roughly be getting ~180 watts @ 4 ohms.

 

[helotaxi 5,000+ posts]

If the sub is a dual coil 4 ohm sub you could bridge each pair of channels to one coil of the sub and give it about 360 watts.

 

[VinceGulino 10+ year member]

/\ wow thats a lot... it would work?

what if i already have an amp hooked up to my car... would it be a huge trouble to hook up this other amp. would it be worth it?

 

[alphakenny1 10+ year member]

also what sub are you going to use? thats important as well.

 

[VinceGulino 10+ year member]

well i was going to fiber glass the floor in front of the center rear seat and put an 8 inch sub in it. now that i know about the power i can get with a DVC 4-ohm sub im probably going to go for an 8 inch L7 or another sub with that type of credibility.

 

[Polecat 5,000+ posts]

true, you can only use two of the four channels, should have been more clear on that, but if you do the L7, with 360 watts, that'll work fine.

 

[flakko 5,000+ posts]

you also have to match the gains EXACTLY, or itlle sound funky

 

[helotaxi 5,000+ posts]

you also have to match the gains EXACTLY, or itlle sound funky

As long as the two channel pairs are getting the same signal (mono) you don't have to be too precise. The power from each set will sum magnetically in the motor of the sub. Might not get the absolute max out of the sub without setting the gains right on the amp but it won't affect the sound. Gain matching is critical if you are running multiple subs off different amps in a common chamber enclosure or are engaging in SPL comps.