https://makezine.com/article/craft/music/the-cracker-box-amp-subwoofer/
The 'cracker box' amp subwoofer - Make:
Apr 19, 2009 - From the MAKE Flickr pool Andrew's neglected subwoofer found new life as a mini guitar amp -So I made the $5 Cracker box amplifier
the crackeramp subwooferboxmake
https://imgur.com/a/dtlfl
Subwoofer plate amp repair - Album on Imgur
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subwoofer plate amprepairalbumimgur