Your 15 year old integrated - assuming it's a decent make and model in the first place -should be fine. Fifteen years ago was 2006; amplifier technology HAS changed in that time, of course, but unless you're going Class D or looking for streaming/HDMI options, a good amp fifteen years ago is going to be a good amp now, aging capacitors and/or tubes notwithstanding.
Revels are superbly made speakers. They'll sound great.
Revels are superbly made speakers. They'll sound great.