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Power source for car amp

post #1 of 17
Thread Starter 
I have a car amp (Hifonics 750W 60A) that I want to use to power some subs inside my house. Since computer power supplies have 12V output I think it would be the most logical power source for the amp. Now I know that computer psu's are not made for that kind use, so to keep power flow steady and reduce possible damage to the power supply I can use a capacitor.

Now I'm wondering which power supply and what farad capacitor I'll need. I hooked my Corsair 750TX (720W and 60A on the +12V rail) up to it and it performed excellently. Do you think that the 750TX will a good candidate? Or should I step up to the 850TX for a little more headway? I'm sticking with corsair because of their outstanding quality, 5 year warrenty, and the single +12V rail.

I'm not too familiar with capacitors, all I know is the more farads the more it can hold. So how many farads do you think I'll need so there isn't too much stress on the psu when the subs hit?
    
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post #2 of 17
Why would you use that? Just get your self an home amplifier and use the outputs with 1/4 phono to to rca connector from radioshack. Then run the wires like normal. Should work fine.
    
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post #3 of 17
1/2 Farad per 500 watts as a general rule.
    
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post #4 of 17
You have the voltage, however most car batteries have at least 300 or so cranking amps so i would say you will need something else instead of this amplifier you have in mind. My car had a battery with 365 cranking amps when i got it, and to stop it making my lights dim when the bass kicked in with my new sound system i had to get a bigger battery with 550 cranking amps to handle it.
    
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post #5 of 17
A capacitor would also help with your dimming lights problem and prolong your battery life, which is what I think he was planning on doing in his setup.
    
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post #6 of 17
Yeah, my bad, i didnt read his post properly. ops:
    
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post #7 of 17
Almost all computer PSUs have a minimum load requirement for the 3.3V and 5V rails for the unit to operate properly. Loading up just the 12V will cause problems and shorten it's life span. The only PSU I know of that has no minimum load requirements on the 3.3V and 5V rails would be this: http://www.newegg.com/Product/Produc...007&Tpk=es-800. But then it is a multi-rail so you would have to bypass the OCP by wiring the rails back together which also may cause a problem with the pi-filter. If you don't care about longevity, go ahead and use a computer PSU. Sure it's a neat little thing to play around with using a junk PSU you don't care about, but these PSUs are not designed for this so you have been warned.
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post #8 of 17
Thread Starter 
Right, I forgot about the minimum load requirements. Couldn't I just wire some resistors to the 3.3v and 5v lines to create some load on them? I don't plan on using it 24/7 or anything, maybe an hour max once every few days or so.
    
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post #9 of 17
The easiest would probably be to get a dedicated 12V power supply rather than a computer power supply.

I'll try to look up some potential candidates through electronics warehouses tomorrow morning and link them then.
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post #10 of 17
yes its been known that people use computer psu's to power car amps but the question is how long u can have them last... it would be easier for you to just git one of these and put it in a separate box.

http://www.parts-express.com/wizards...TOKEN=52486508

i have this one powering a 10" mtx sub in my house and works really good
http://www.parts-express.com/pe/show...number=300-805



BTW that 10" sub shakes stuff halfway across the house
Edited by bobfig - 12/24/08 at 9:50pm
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