Bolero:why can't my system reproduce snare well?

For those of you who don't follow my posts religiously, I recently purchased a pair of Martin Logan SL3's. I love them; they especially excel with voices. However, last night, I was listening to Bolero, and the snare sounded terrible. It sounded muffled and faint. I adjusted the settings, and nothing helped. I am using a MC275 and c2300, so I assume the problem is with the speakers. Any suggestions, ideas? Thank you in advance.