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  1. CPR needed for DIYMA R12 sub

    Equipment Repair and Modification
    Hi everyone, I found an old R12 sub (probably acquired 8 or 10 years ago) in one of my toy boxes over the weekend, so I thought I would fire it up. At very low volume it sounds fine, but develops a loud buzzing (in time with the bass output) when the volume is increased. The buzzing level also...