I was reading the threads on nomadness.net regarding the new MuVo Micro and came across this response from Mr. Harvey Fong in answer to a similar question regarding the output of the MuVo Micro:
"I don't have a power rating either, but it's not all power that determines the volume. The power game has been used far too often over the past 40-50 years to sell hi-fi equipment wih most people not having the slightest idea as to what it really represents, most presume more power, more louder. And of course the industry just keeps the myth going and everyone is trying to figure out a different way to lie about the actual power level, like it makes some sort of difference. (sorry, this one gets me ranting, and I'm old enough to remember when it first got started).
For audio equipment it is SPL (Sound Pressure Level) that determines how loud an it is expressed in decibels, not watts.
Anyway, on to your question. You're more likely to encounter a noticable difference if happen to load the limited output from the European firmware instead of the firmware that is shipped to the rest of the world. You shouldn't notice too much of a difference between the individual products."
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Harvey Fong
Technical Marketing Specialist
Audio, Speakers, Personal Digital Entertainment
Creative Labs Inc. - USA