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Old 4th October 2008, 02:05 AM   #1
diyAudio Member
 
Join Date: Oct 2008
Question Need help with a new sub, a couple of n00bish questions

I'm trying to figure out how to figure out what size amp i need for this woofer

Rockford Fosgate P1S415:
15" 4-ohm subwoofer
molded polypropylene woofer cone with poly-foam surround
17-gauge steel bend frame
power range: 50-200 watts RMS (400 watts peak power)
frequency response: 24-250 Hz
sensitivity: 87 dB
top-mount depth: 6-5/16"

Polk Audio MM1240D:
power range: 100-360 watts RMS (180 watts RMS per coil)
peak power handling: 720 watts
frequency response: 27-200 Hz
sensitivity: 88 dB
top-mount depth: 4-5/8"
sealed box volume: 0.88 cubic feet


im planning on making a ported enclosure

for this kinda driver i only need a 250watt amp?

I bought both $50 each in box so no complaints also im using one for my car but that takes back seat for the one for the home theater

http://img528.imageshack.us/my.php?i...2773312mr2.jpg

Theile/Small parameters:
RF:
http://www.rockfordfosgate.com/rftec...15_revA-TS.pdf
PA:
http://www.polkaudio.com/downloads/m..._Sub_WebMN.pdf


the wall with the tv to the kitchen is about 30 feet

Thanks a bunch from a confused little friend
alfa
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Old 4th October 2008, 07:07 AM   #2
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
Power isn't critical; there's a lot of leeway for a home theater application because the bass is usually intermittent. Not a like a car or party situation where it may be pounding at full volume for extended periods.

200 watts seems like a nice amount to aim for. Don't overlook used "pro" amps; they generally give you more watts per buck than a plate amp. Keep your eyes open at thrift stores, pawn shops and yard sales, if you can be patient. Or watch eBay for auctions near you; shipping costs may deter people from bidding.
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