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Old 12th June 2005, 07:23 AM   #1
Chaucer is offline Chaucer  United States
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Default Car amp running off a deep cycle battery = less noise?

I've read about the chip amps running off a dedicated sealed lead acid battery and how it eliminates the noise that's caused by the power cords. Does the same apply to car amplifiers? I can purchase a brand new JBL 60x4 (@ 4 ohms) car amp for $65 (retails for $170) and I already have a deep cycle battery I can use with it. I will be running the amp on a pair of NSB line arrays and using an active crossover, hence the reason for needed 4 channels of amplification. Do you guys feel this is a good idea or would I be better off buying a true home audio amplifier, with 4+ channels? Only problem is that will run me a lot more.

Any pros or cons are appreciated. Thanks.
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Old 12th June 2005, 01:38 PM   #2
anatech is offline anatech  Canada
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Hi Chaucer,
Car amps have a switching power supply built in and may have poorer S/N ratio. Chances are they will. A pair of good home amps will cost more than $65.00. These are the truths of life.

Why not build a good stereo, and another later once you are happy. Or buy good two channel amps. The better amplifiers have excellent S/N ratios. Costs more but actually does the job you ask of them.

-Chris
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Old 12th June 2005, 05:37 PM   #3
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Default Re: Car amp running off a deep cycle battery = less noise?

Quote:
Originally posted by Chaucer
[B]I've read about the chip amps running off a dedicated sealed lead acid battery and how it eliminates the noise that's caused by the power cords.
There is no noise due to power cords. No need to go to batteries.
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Old 13th June 2005, 07:35 AM   #4
Chaucer is offline Chaucer  United States
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What I meant to say was noise caused by using your home power wires, unlike a contained unit like a sealed battery.

Any suggestions for powering 2 active 2-way speakers on the cheap side, and not a T-Amp?

Thanks.
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Old 13th June 2005, 11:48 PM   #5
anatech is offline anatech  Canada
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Hi Chaucer,
Is there anything noisier than taking your 12~14 VDC and chopping it up (as in square wave), then rectifying and filtering it again?

A decent power supply will ignore (clean / filter) completely all but the worst AC noise, I'm thinking lightning, power fail or industrial motors.

Will a car amp work? -Yes. Will it sound as good as a good home amp? - No, why would it at those prices??

It really sounds like a budget decision you are making. The cheap car amp is cheaper. And everything else that means.

-Chris
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Old 28th June 2005, 06:52 PM   #6
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how about taking that car amp ( or any amp) and measuring your rail voltage. then replace the power supply with batteries. You can do +- 24v rails with the lead acid batteries for dirt cheap using 4 of them.

http://www.gruberpower.com/purchase/...ries+%2D+Small


12v 7 ah for $7
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