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  1. SPL Meters | Mic's | Calibration | Sound Cards
    I have been using a CM-140 in my home theater for the past 6 months to set speaker levels. I have probably used it in 4 sessions - 30 minutes each. The problem is that the meter previously measured ambient noise at around 49dB (i.e. all sources off, AC off, etc -- basically as quiet as the room...
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