The power rating of speakers is generally referring to the maximum level where the speaker won't be damaged or distort but typical listening levels require much less power. The sensitivity of the Klipsch B-10 is 90 dB, which means that at a distance of 1 metre, 1 watt of input power would generate audio at around 90 dB, which is quite loud.
Other than home theater usage, you usually don't need much power.
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