What size amp for two 10" and one 12" subwoofers?

Question:
two 10" 150 Watt RMS and one 12" 400 Watt RMS, not sure what size amplifier i need

Answers:

800 watts. Check out this online store. I bought my whole system (4 12's, cd player, and a 2000 watt amp for less than 250 dollars) I believe an 800 watt amp was only like 60 bucks. It's called Thrillaudio.com

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Because of the difference in power handlings, you'd be better off with two amps.

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As long as all subs are 4 ohm SVC:

If it were you, which sub of these 3 would you buy?

A 300 watt RMS @ 2 ohm amp for the 10's.
A 400 watt RMS @ 4 ohm amp for the 12"

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I would go with two seperate amps.you should get more power than you need, then turn the gain down to about 1/2 to 3/4. It's a lot better than getting less power, and then wishing you had bought a bigger amp.

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I would think that you would get a lot of sound cancelation from running two different size woofers, but two answer your question I agree with running 2 amps.

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No one has mentioned the current draw...

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To run the two amps, which is the best way because of the different wattage of the subs, your looking at about 800watts.

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This means the amps will be pulling about 60amps. Can your battery and alternator handle it? And as its bass and more bass I suggest you get a pair of 1 farad capacitors one on each feed from the battery to the amps to cushion the spikes on the battery when it kicks.

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How did I calculate 60amp? There is a formula.

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amps = watts / voltage

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We know you need 800watts so

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amps = 800 / 13.5 which gives 59.26 (60amps)

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Hope this helps.