Soliloquy 6.2 Very Poor Treble .....

After several calls to David Berman at Soliloquy, without a response. I will put it to the Audiogoner's . Will I need to change the tweeter or rebuild the crossover to "brighten up" the highs in this speaker....Or should I just trade them off and start over ????. I kind of like the speakers if I could get them to sound a little better. Maybe that is why they are no longer in the speaker business...I think that changing the tweeter would be the easiest but I will be open-minded.....Thanks