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It would seem that the dynamic range (or really sort of a signal to noise ratio) of a loudspeaker is the combination of all the dynamic ranges of the chain of equipment hooked up to it, less any power compression the speaker introduces. The noise from each piece of equipment adds to the noise from the source, and signal and noise are reproduced by the speaker. If you then factor in ambient noise, the dynamic range could very well be as low as 75dB, or even lower.
I have speakers that can do 105dB with 6Watts, and just say the S/N of my amp is 90dB and that of my CD player is 90dB. I believe the S/N of the combo would be 84dB, so when my speakers are playing 105 dB, there is somwhere around 21dB of noise coming out. If my ambient noise level is 30dB (the combination of 30 and 21 would essentially be 30), then the S/N or dynamic range of my system would be 105-30=75dB.....
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Dynamic Range of Electro-mechanical Transducers?
