Soliloquy 6.2 Very Poor Treble .....

Just to see if it is worth it to mod the speaker, try using a simple wire with alligator clips on both ends to bypass the resistor that probably exists in series with the tweeter. It will take all of about one minute to accomplish this, most of which will be analyzing the crossover circuit itself.

If this adds at least as much sparkle as you are looking for, the path to happiness is easy. If you like it as is, remove the resistor. If things are too bright, try guesstimating the value the replacement resistor would be. As an example, if there is a 10 Ohm resistor in the circuit and bypassing it makes things screechy, try a 5 Ohm resistor. In the end, use a resistor at least as good as the OEM, and you will wind up with both more detail and less glare.

If going down this road works out, you will not affect the resale value whatsoever.

Autospec,
I see that you are selling those speaker cables. My suspicion is that a different pair of speaker cables and some more break-in time will be the ticket. You might even try a pair of Signal Cables. They're inexpensive, and worked well with those speakers. I've owned the 5.3's and the 6.2's, and neither had dull highs, except when paired with dulling cables.
Also, if you're not sure about break-in time, read the comments here and on Audio Review about those speakers. Anything less than 300-500 hours, and they just don't sound good.
Good luck,
Howard

I have a pair of 5.3i's, and I agree with Boa2 that the right cabling makes the difference. Speaker cables: AP Silver ovals in bi-amped configuration. The highs are just fine.

I once owned the 6.3s . All in all very nice speakers. The treble sometimes got a little hot.The speakers never sounded dull.But this may have been something else in the setup..who knows. Silver does have a positive effect on the Sols. Just stay away from silver clad copper hybrids. It makes the speakers sound a tad thin IMHO. I don't like using cables as tone controls ..so YMMV.

If something doesn't work for me. I just sell it and move on.

Too many times, I've found a change in cables to be the problem solver. And three times, this has happened with a pair of speakers that I was resigned to sell. Twice with speaker cables, and once with a pair of interconnects.

You will find a lot of exasperated owners of Soliloquy speakers during the break-in period. It all depends on how far you're willing to go to try and make it work. Personally, I think it's a shame to write off any component before I've allowed it to work to its potential. That could be via a change in cables, tubes, maybe even the orientation in the room. But hey, that's just me.