How much overhead on a sub amp? - AVS Forum | Home Theater Discussions And Reviews

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post #1 of 5 Old 12-14-2012, 01:14 PM - Thread Starter
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I've been doing some research on an amp for a home theater sub build and it looks like a lot are saying that getting an amp rated at more power than your sub actually needs is the best option.

I'm building a sealed enclosure for a 15" sub that takes 1,250 watts RMS. The sub is Dual 2 ohm and I will wire it into 4 ohm.

My receiver is a Pioneer Elite SC-25 and I'm not sure what the volts are on the sub out??

I've been looking at Crown XTi and XLS amps, Behringer, and others putting out around 1200 to 1500 watts in 4 ohm bridged mode but am considering ones that put out 2000 watts+ if having overhead is a good option.
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post #2 of 5 Old 12-14-2012, 01:46 PM
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what driver in what enclosure?

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post #3 of 5 Old 12-14-2012, 01:53 PM - Thread Starter
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WinISD wont have it, it's a custom built sub based on a TC Sounds TC-9 motor going in a 4.8 cft sealed enclosure.
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post #4 of 5 Old 12-14-2012, 03:30 PM
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do you have the thiele-small parameters?

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post #5 of 5 Old 12-14-2012, 03:39 PM
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Headroom is good, but if the driver is displacement limited to well below Pe there's not much reason to go higher than the driver Pe rating. Model it to see what the displacement limited power is before deciding how much amp to get.

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