calculating power

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=31102
Printed Date: June 11, 2024 at 7:00 AM

Topic: calculating power

Posted By: qwicksilver17
Subject: calculating power
Date Posted: April 27, 2004 at 2:42 AM

hey guys im running a mtx 1501 d and its pushing my Audiobahn alum 10 Q sub which is running at 3 ohms. the specs on the amp say it runs 500 watts @ 4ohms and 1000 watts @ 2 ohms rms 12.5v dc, im wondering how would i calculate the power at 3 ohms..

also, i upgraded my alternator and man its sweet but im still blinkin the lights when the bass hits. should i go ahead and put an extra optima battery or just stick a cap on it?, ( if anyone has pics of an extra battery inside an extended cab s10 let me know)

Replies:

Posted By: thapimpfromchi
Date Posted: April 27, 2004 at 2:50 AM

I dunno, my guess would be around 750. Right between 500 and 1000. I dunno how else to calculate it. lol. hope that helps.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Posted By: qwicksilver17
Date Posted: April 27, 2004 at 3:36 AM

that was my guess too cus ohms law isnt helpin

Posted By: flatulatta
Date Posted: April 27, 2004 at 8:20 AM

[QUOTE=stevdart]

Use the Ohm's Law formula P = E squared / R https://www.the12volt.com/ohm/page2.asp

With a DMM, measure the AC output voltage at the speaker terminals, square that number, then divide that by the ohm load that the amp sees from the speaker(s). That will give the RMS going to that speaker load.

[/QUOTE

Posted By: qwicksilver17
Date Posted: April 27, 2004 at 11:00 AM

thanks alot bro.