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Term: Sensitivity
Definition: In simple terms, the more efficient the speaker, the lower the power requirements of your amplifier to drive them. If sensitivity is say 94dB at 1m for 1W input, then to produce your target volume, you need an amplifier of 1W ONLY!! If your speakers are rated at say 85dB sensitivity, then your amplifier needs to be 94-87=9dB louder and needs to be much more powerful to produce the same sound level.
Associated link: http://www.dt4u.com/dtsystems/speakertech.php
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