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High Fidelity 7.1 Surround Sound 30 50 100 200 500 1k 2k 3k 5k 10k 20k 30kHz DistanceLoudspeaker-mic:104.3cmdBSPL normalizedon1Meter O PN-1411Monitor (87.0dBDiff:0.01)-dBSPL 1W/1M
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