250W Subwoofer Amplifier

I’m building a 5.1 surround sound system. Therefore I need a subwoofer. This project is the amp for that subwoofer.

The circuit drawings that I want to use for this project can found here:
The amplifier: http://marcusgun.awardspace.com/m250.html
The subwoofer filter: http://www.circuitsonline.net/circuits/view/69


Today I mounted the heatsink on the enclosure:

Kast met koelprofiel

Kast met koelprofiel

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