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-   -   Looking 500W 4ohms amplifier for Polk Subwoofer (http://www.diyaudio.com/forums/subwoofers/146385-looking-500w-4ohms-amplifier-polk-subwoofer.html)

samsagaz 23rd June 2009 05:27 PM

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.

AndrewT 23rd June 2009 05:39 PM

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.

samsagaz 23rd June 2009 07:12 PM

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 :(

samsagaz 23rd June 2009 08:18 PM

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

AndrewT 24th June 2009 09:47 AM

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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