Play them a solo piano or violin recording - they will either marvel at how realistic it is or ask how loud and how much bass the system has and you'll know whether to dump them immediately or spend more time on them.
I had one guy swearing that his speakers were the cat's ass and their only limitation was bottom end. Had him bring them over and play them on my system and compare with my speakers - too about 2 minutes to convince him that bass wasn't the only thing lacking in his speakers.
I had one guy swearing that his speakers were the cat's ass and their only limitation was bottom end. Had him bring them over and play them on my system and compare with my speakers - too about 2 minutes to convince him that bass wasn't the only thing lacking in his speakers.