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I forgot to mention that the sensitivity will greatly influence decibel output also. For instance, a speaker with a sensitivity of 87 decibels @ one meter will put out the same volume with a 200 watt/channel power amp as a speaker rated at 93 decibels will with an amp rated at 50 watts/channel.

A bit dated, but a good indicator of which brands/lines might prove to be most accurate as far as listed power ratings: Click here for link