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Amp RMS vs Sub RMS

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Old Jan 3, 2008 | 06:24 AM
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Default Amp RMS vs Sub RMS

Happy New Year to all at S2KI!

Quick question...

I have an Alpine PDX-4.150 amp with 2 channels powering my components leaving the other 2 to bridge (300RMS) for a sub. Will this be enough juice to drive Alpine's 500RMS Type R 10" sub (SWR-1042D) sufficiently?

Many thanks.
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Old Jan 3, 2008 | 08:49 AM
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yes.

those amps are birthed at 170-180 watts per channel.

they are known to supply more than 340-360w per channel bridged even tho they claim no gain.
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Old Jan 3, 2008 | 10:26 AM
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yes it will power it, but it will sound horrible..

you will experience a lot of clipping.

its not enough to "sufficiently" power your sub
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Old Jan 3, 2008 | 11:40 AM
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Hankook: Not enough power doesn't result in clipping. Too much power is what causes clipping. Not enough power usually results in less than stellar performance from the speaker/subwoofer (most obvious is less volume/bass).



OP: Try it and see if it works for you. If it's not enough power, simply add a 2nd amp
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Old Jan 3, 2008 | 01:10 PM
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i think its more of a factor of running your amp at full volume to get your sub to punch louder. that will cause distorsion. If you want to be able to play your sub to its full potential or be able to get the most out of your amp, look for a separate amp. But, if you just want a little extra and dont wanna always be playing your amp as loud as possible, you will be fine, just make sure to tune everything right and not over-gain it.
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Old Jan 3, 2008 | 03:14 PM
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Originally Posted by sleekblackroadster,Jan 3 2008, 12:49 PM
yes.

those amps are birthed at 170-180 watts per channel.

they are known to supply more than 340-360w per channel bridged even tho they claim no gain.


I have 120 watts going to my type E 12 inch and it is plenty loud.

more critical to power is enclosure design.....design a good box and that sub will sound just fine with 100 watts....just not as loud....300+ is fine....just a question how loud you want it.

Remember .....to double loudness.....quadruple power.
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Old Jan 3, 2008 | 03:23 PM
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Originally Posted by HankookS2K,Jan 3 2008, 02:26 PM
yes it will power it, but it will sound horrible..

you will experience a lot of clipping.

its not enough to "sufficiently" power your sub
Wrong
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Old Jan 3, 2008 | 05:06 PM
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Originally Posted by Neutered Sputniks,Jan 3 2008, 01:40 PM
Hankook: Not enough power doesn't result in clipping. Too much power is what causes clipping. Not enough power usually results in less than stellar performance from the speaker/subwoofer (most obvious is less volume/bass).



OP: Try it and see if it works for you. If it's not enough power, simply add a 2nd amp
ahhhh sorry i should have read my post before posting, thats what i meant....sorry guys loooong day at work lol.

that is correct though overpowering causes clipping, but while underpowering does detoriate the sound at higher levels.
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Old Jan 4, 2008 | 12:40 AM
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Thanks all for your replies!

To add a few more things into the mix...

I have a WLAURENT enclosure and a pretty damn old DEI Pro+ (DUAL 4ohm, DVC) 10" sub rated 250rms. Am I better off sticking with that than upgarding to the more modern but power hungry Type-R? My concern being that my existing sub will be prone to clipping with the extra power.

I'm not after HUGE bass, just something that I can hear/feel and distinguish from my component woofers. I'm stuggling to notice my sub in the cabin much at all at the moment but I think that may be down to the fact my sub has been wired 'in series' rather than 'parallel'.

I guess if I change the wiring this w/e and my S bounces (without distortion ) down the road I have my answer!
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Old Jan 4, 2008 | 06:18 PM
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Clipping happens when you overdrive an amp.....
if you over-amped a sine wave....the peaks and troughs get flattened.

Speakers are not "power hungry". Ratings on speakers are power handling-not usage.

Your PDX amp is 4 ohm stable in bridged mode....so try using one voice coil on the DEI sub. This is OK to do. Do not wire the DEI in Parallel...this will overdrive the amp and causel clipping/overheating.

You should use the speaker that better matches the enclosure you are using.
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