Confused about Ohm ratings

motocrossmonks
10+ year member

Junior Member
Hey there, I was about to buy a 15" dual voice coil 4ohm 750W rms alpine type r sub.

I was going to buy a mono amp which was a 750W rms @ 4ohms X 1channel. So i figured it was perfect, Untill i reserched on crutchfield and found this wiring diagram for DVC subs and mono amps.

heres the diagram.

http://www.crutchfield.com/S-SOrp4Fviwrd/learn/learningcenter/car/subwoofers_wiring.html

It shows a 2ohm load from the amplifies to the sub wich shows 4ohms.

So does this mean I need a 750WRMS 2ohm or 4ohm amplifier??

heres the link for the sub and another link for the amp I was GUNNA buy below.

http://www.sonicelectronix.com/item_4194_Alpine+SWR-1542D+-TYPE+R-.html

http://www.sonicelectronix.com/item_12196_Boss+SE2500D.html

please help me out here I dont want to be over/under powering my sub. Thanks!!

 
get the 4 ohm version. Also, use a mono amp rated at 1000 RMS or higher at 1 or 2 ohms.

That r can handle 1000 watts daily, you will have to wire it down to 2 ohms on the amp if it is a 4 ohm woofer.

If you get a 2 ohm woofer, look for 1000 rms at 1 ohm, since you will have to reduce it to 1 ohm on the amp

Seriously, going over 1000 rms on the amp will benifit your sub output since the r's are power hungry little bastards

 
okay, sorry but I still dont really get it. With DVC subs, will the mono amp always have half as much ohm rating as the sub??
If the sub is a 4 ohm, you have to wire it to half of that subs ohm load, so you will need a amp that does the subs rated power at 2 ohms. Just, do what i said above and you will be in perfect shape.

How much are you looking to spend on an amp? I can find you one, that will match that R great

 
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