I have been using the Rushmore's for just a few months now. Hope to write a review once they are fully run in but so far they accurately reflect Nelson Pass's own decription on the Pass Labs website and whitepaper (downloadable)..provided your reference is 'live' music as heard through the microphone, and, provided you match them well with upstream components..
If you have any specific questions about their sound, I can try to answer them.
If you have any specific questions about their sound, I can try to answer them.