current needed for 800w car amplifier?
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=104827
Printed Date: May 10, 2025 at 11:16 PM
Topic: current needed for 800w car amplifier?
Posted By: ktennessen
Subject: current needed for 800w car amplifier?
Date Posted: May 18, 2008 at 8:37 PM
I'm trying to hook up some car subs to my home theater. I have some 120V AC to 12V DC converters lying around. The current output on some of the converters are adjustable so I just need to know the current output from the converter that is necessary to run an 800W car amplifier. I understand that I=P/E, but I'm not sure how to apply the numbers in this situation. I need the current necessary from the converter to the amplifier, not from the amplifier to the speakers.
Replies:
Posted By: i am an idiot
Date Posted: May 18, 2008 at 9:13 PM
It would help if we knew the brand of the amp. How many amps is the power supply rated at? You will need at least a 35 amp supply, and this may not be enough to get max power from the amp.
Posted By: ktennessen
Date Posted: May 18, 2008 at 9:40 PM
Its a Boss SE550 400Wx2 @ 2 ohms. I can't find the current rating online and I don't have the amp with me to see if its on there anywhere.
Posted By: haemphyst
Date Posted: May 18, 2008 at 9:43 PM
Whatever the fuses in the end of the amp total. If you have two 20A fuses, (pretty likely, as it is a Boss amp, and SPECTACULARLY over-rated) then you would need 40A worth of current. If not planning on running it WFO, ever, then you would simply buy as big a power supply as your pocketbook can support.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: i am an idiot
Date Posted: May 18, 2008 at 9:57 PM
i am an idiot wrote:
How many amps is the power supply rated at?
35 and above amp power supplies are not the norm.
Posted By: the12volt
Date Posted: May 18, 2008 at 10:05 PM
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