confused about ohms need help

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=29960
Printed Date: May 14, 2024 at 8:11 AM

Topic: confused about ohms need help

Posted By: o9cky0984
Subject: confused about ohms need help
Date Posted: April 08, 2004 at 2:02 AM

MY amp is 250 rms x2 or 500 rms x 1 at 2 ohms stable, my question is can i run 2 - 4 ohm subs on this amp? Also how would i wire this set up is posible?

Replies:

Posted By: xtreamcc
Date Posted: April 08, 2004 at 2:06 AM

yes, well, if you have a single voice coil sub that is 4 Ohms you can just wire postive to postive and negative to negative. If you have a dual voice coil sub that is dual 4 ohm coils you'll want to wire them in parrallel to get a 2 ohm resistance. To do that just wire one positve to the other and one negative to the other then run them both to the amp (you'll have one line from the amp, then just run the line from the first coils positive to the other coils positive and the same for the negative).

-------------
"Shiny chrome when used in conjunction with bikini models is particularly effective in inducing brain deficit disorder"

02 Jeep Grand Cherokee

Monster System on its way.

Posted By: o9cky0984
Date Posted: April 08, 2004 at 2:11 AM

they are single voice coil so i just reverse positive and negative coming from the amp?

Posted By: xtreamcc
Date Posted: April 08, 2004 at 2:17 AM

reverse? I dont think I said anything about reversing. I just ment connect the amp's hook up to the same polarity of the subs (positive to positive, negative to negative) sorry if I confused you posted_image

-------------
"Shiny chrome when used in conjunction with bikini models is particularly effective in inducing brain deficit disorder"

02 Jeep Grand Cherokee

Monster System on its way.

Posted By: o9cky0984
Date Posted: April 08, 2004 at 2:20 AM

ok thanks didnt want to mess up a set of xtants by hooking them up to something that wouldnt work

Posted By: DYohn
Date Posted: April 08, 2004 at 8:21 AM

What's the make/model of your amp?

-------------
Support the12volt.com

Posted By: o9cky0984
Date Posted: April 08, 2004 at 11:46 AM

its just a jensen 500 watt from sears i bought it from a friend a few months back im also running a compacitor im not sure on the model of the amp its in my trunk and i dont feel like going outside right now to find out

Posted By: DYohn
Date Posted: April 08, 2004 at 12:06 PM

Which model Jensen? XA2250? The RMS power output on that amp is actually closer to 125 watts into 4 ohms per channel, and that's on a good day. Jensen amps cannot be bridged into a 2-ohm load, they require a minimum 4-ohm load. I recomend you connect your subs in series to this amp bridged. This will place an 8-ohm load on the amp and deliver at best 125 watts RMS to each sub. Hook like this:

posted_image

-------------
Support the12volt.com

Posted By: o9cky0984
Date Posted: April 08, 2004 at 12:11 PM

its model xa2125

Posted By: DYohn
Date Posted: April 08, 2004 at 2:04 PM

Same hookup. 4-ohm stable in mono mode. Actual output on this amp is about 100 watts per channel into 4-ohms (again, on a good day.)

-------------
Support the12volt.com

Posted By: customsuburb
Date Posted: April 08, 2004 at 2:16 PM

I didn't know that Jenson amps could have good days. posted_image

Posted By: o9cky0984
Date Posted: April 09, 2004 at 2:45 AM

well mine has had a few good days and since i work at taco bell making not too much money its good enough for me right now