Pro Audio DIY | I was offering this german summing mixer here a couple of weeks ago just before refurbishing it | Facebook
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Audio Mixer 4 Channels Amplifier | Individually Controls Board | Mixer 4 Channel Input - Home Theater Amplifiers - Aliexpress
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Music Hackspace on X: "DIY passive audio mixer built today at the workshop led by @CasperSoundman http://t.co/uXtt9e7Fo3" / X
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