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Hall Technologies AMP-4840-Audio power amplifiers and digital audio splitters | AVProSupply
RS232/485 Single Serial Volume Controller - Redback Audio
Amazon.com: Kanex Pro Mini 3-input (1 digtal, 2 analog) Audio Amplifier with Mic Mixer, 40 Watt amplifier output at 70V or 100V, IR remote & sensor included (AP3DBL) : Electronics