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Old 23rd June 2009, 04:27 PM   #1
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Default Looking 500W 4ohms amplifier for Polk Subwoofer

Hi guys, i need to build an 500W AMP for my 4Ohm Polk MOMO Subwoofer.

My budget are like 200USD, i dont want to purchase an plate Amp, i want to build it myselft.
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Old 23rd June 2009, 04:39 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
look at the quasi range of amplifiers.
Is this PA/disco use or domestic use?
The power supply and cooling requirements for these are very different.

Expect to need a 45+45Vac, 750VA transformer.
Price that and add in some 80Vdc smoothing capacitors and your budget is almost gone.
Now look for a heatsink and chassis and amplifier and hardware and you're way over budget.

Buy an old but good working order PA amplifier.
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Old 23rd June 2009, 06:12 PM   #3
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oh

I need it for Home.


What about UCD400 amps?


will try to find some amp here, but in argentina is hard to get good amps at nice price
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Old 23rd June 2009, 07:18 PM   #4
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what abt something like this?


http://cgi.ebay.com/Mofet-400-400W-S...kparms=65%3A12|66%3A2|39%3A1|72%3A570|240%3A1318|301%3A1|293%3A1 |294%3A50
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Old 24th June 2009, 08:47 AM   #5
AndrewT is offline AndrewT  Scotland
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1pair of Mosfets are never going to meet your 500W target.
That amp is specified as 200W into 4r0, but it's probably nearer the truth as a 150W into 8r0.
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