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<blockquote data-quote="keep_hope_alive" data-source="post: 7524192" data-attributes="member: 576029">stop trying to use computer power supplies - they will only give you issues and will not be sufficient for your needs.&nbsp; in general, don&#039;t parallel power supplies - they don&#039;t like that either (unless you have properly rated diodes isolating them (and dealing with the voltage drop across the diode).for the price of a good power supply capable of higher current at 12.5-13.8VDC you could buy a plate sub amp that will do more than you&#039;ll need.&nbsp; Even this one is outstanding (i&#039;ve tested it with a variety of car subs and it does great).&nbsp; it also includes crossovers, turn-on, etc.<a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-804" target="_blank">Dayton Audio SA240 240W Subwoofer Amplifier 300-804</a>they also have 500W and 1000W versions if you think you need more.this will do more than your &quot;400W&quot; amp could simply because of the difficulty in maintaining the DC supply voltage/current necessary to make rated power.or look to ebay for 13.8V 25A power supplies.&nbsp; but every time, the sub plate amp wins.&nbsp; &nbsp; they are also great to have around for testing subs.------------i&#039;m glad someone picked up on the different voltages out of the PC power supply and the limited current available at +12VDC.</blockquote>

[QUOTE="keep_hope_alive, post: 7524192, member: 576029"] stop trying to use computer power supplies - they will only give you issues and will not be sufficient for your needs. in general, don't parallel power supplies - they don't like that either (unless you have properly rated diodes isolating them (and dealing with the voltage drop across the diode). for the price of a good power supply capable of higher current at 12.5-13.8VDC you could buy a plate sub amp that will do more than you'll need. Even this one is outstanding (i've tested it with a variety of car subs and it does great). it also includes crossovers, turn-on, etc. [URL="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-804"]Dayton Audio SA240 240W Subwoofer Amplifier 300-804[/URL] they also have 500W and 1000W versions if you think you need more. this will do more than your "400W" amp could simply because of the difficulty in maintaining the DC supply voltage/current necessary to make rated power. or look to ebay for 13.8V 25A power supplies. but every time, the sub plate amp wins. they are also great to have around for testing subs. ------------ i'm glad someone picked up on the different voltages out of the PC power supply and the limited current available at +12VDC. [/QUOTE]

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