Originally posted by MacAllcock:
[...]Strangely enough, and despite the questions about terminology, if FTC equates to "RMS" then the phrase "500W Maximum Burst Power" could well accurate for transients.
Even if "FTC" equates to "Music Power" this is quite a powerful system and could do a pretty good job for you.
FTC is an abbreviation for Federal Trade Commission, a part of the US Government. Power specs conforming to the FTC regulations are indeed RMS, and have further requirements. See: http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=ae2020986a61a092a9fe8d10258c8450&rgn=div5&view=text&node=16:1.0.1.4.47&idno=16
A good general discussion of audio power ratings can be found at:
http://en.wikipedia.org/wiki/Audio_power --Barry