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Loudness level gain volume perception dB factor volume conversion ratio gain level in decibels formula dB field quantity energy size power voltage damping convert to factor attenuation amplification acoustic intensity cause sound
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dB calculate - decibel calculation dB calculator voltage power ratio sound pressure level matching dBA SPL sound pressure intensity ratios converter thd percent % audio engineering impedance matching bridging - sengpielaudio Sengpiel Berlin
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