Fuse how many Amps

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=21734
Printed Date: September 11, 2025 at 1:20 PM

Topic: Fuse how many Amps

Posted By: flashalexb
Subject: Fuse how many Amps
Date Posted: November 20, 2003 at 10:52 PM

What size fuse should I use for the Audiobahn A8002T amp? https://www.audio-warehouse.com/web/mdl/A8002T/detail.asp

Its 2x400 watts rms at 2 ohms

Replies:

Posted By: mobiletoys2002
Date Posted: November 20, 2003 at 11:52 PM

If the amp is running briged at 800 watts you are looking at about 65 amps of current draw if it is running at 200 watts by 2 stereo your draw is about 30 amps so dont go larger tahn the 6maybe a 70 if you brige the amp and if you run stereo at 4 ohms then use a 30 amp fuse or so . It is better to under rate a fuse than to over so use the least value of fuse that does not blow at full volume the values given should be right.

Posted By: flashalexb
Date Posted: November 21, 2003 at 3:19 PM

But Ive heard that if you use a fuse that is to underrated then it will limit the performance of your subs. Is that true?

Posted By: bberman1
Date Posted: November 21, 2003 at 3:30 PM

To calculate the fuse take the rms 800 divide by voltage 12.8 and you will get the amps 62.5. I would use a 60 amp fuse, which will give you the closest fuse rating. As far as a fuse limiting the performance of your sub it’s not true. The only thing that would happen is you would blow the underrated fuse.

Posted By: mobiletoys2002
Date Posted: November 21, 2003 at 5:36 PM

a 60 amp fuse would be perfect ,and bberman is correct the fuse will only blow and cannot limit performance. it is better to under do a fuse thsn overdue and my original post had a typo dont use the 70 amp use the 60,good luck.

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