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YAMAHA Optimizer Microphone Model WB699600 for Yamaha Systems RX-V659, YSP-1000, YSP-900. YSP-800 - Walmart.com
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Amazon.com: Replacement Room Acoustic Optimizer Microphone for Yamaha AV Receiver RX-V465 RX-V565 HTR-6130 HTR-6230 : Electronics
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Amazon.com: Calibration Optimizer Measurement Microphone Mic ECM-AC2 Compatible with Sony Home Audio System : Electronics
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