Nola contender tweeters - modify?

Bright/harsh when played loud...see reviews. Tweeter issue and/or caps, resistors etc? I'd really appreciate opinions on how to solve the problem, particularly if it's cheaper than new speakers.

Accompanying equipment: VAC Standard 160 MusicBlocs (4 kt88s, 7sn7,12AU7 per amp), Sonic Euphoria PLC, Basis 2001 turntable w/vector III and AT Art9, Rogue Audio Ares w/upgraded transformer.