Originally posted by Paul J. Stiles: One would want constant spl (sound pressure level), which would correspond to constant power (assuming reasonably flat speaker frequency response).
Actually there is a lot of discussion of this and related topics. Apparently it's not quite as cut and dried as that. Keep in mind the 'frequency response' of a speaker will say something like '1w/1m' but it's really a fixed voltage, not a fixed power, measurement. In designing crossovers for custom speakers there is quite a lot to take into consideration and the 'perfect' crossover seldom is really perfect.
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