My speakers don't "dissapear"

Are your speakers pointed at you (toed in)? If so please try aiming them straight ahead and then very slightly begin to toe them in. Also while aimed straight ahead, try small incremental changes in separation distance. There is a sweet spot. I run my Thiel CS6s straight ahead and my Thiel 2.4s with just a slight toe in.

Don't give up!!!

Okay, this is just a guess...

It looks to me like there's a double diffractive edge below the tweeter, formed by the horizontal slot on the front baffle. The ear might be picking up this diffraction as a secondary sound source with a seriously skewed spectrum, as it will occur within the critical .68 millisecond time window between the arrival of the first sound and the kicking-in of the precedence effect.

You might try stuffing something absorptive into that slot, like a thin slice of foam, or otherwise smoothing it over (maybe just a piece of masking tape would help - or better yet duct tape, for that macho look). While you're at it, tape a piece of foam or felt or something along the top edge above the tweeter as well. The sides of the cabinet look like they're nicely radiused, so I don't think they're an issue.

If this helps, you might consider going all the way and contacting Jim Goulding at diffracionbegone.com, as his felt tweeter surrounds work quite well (they received a Golden Ear Award from TAS a couple of months ago).

If this doesn't help, I have another idea but its implications are more expensive.

Duke
dealer/manufacturer

I note that we have not heard from the OP since his first post. We have no idea of the specifics of his listening space, for example. He should provide more details.

What is your address, I'll make them disappear.

You might try stuffing something absorptive into that slot, like a thin slice of foam, or otherwise smoothing it over (maybe just a piece of masking tape would help - or better yet duct tape, for that macho look)

I wondered about that - it is an extremely odd design - like an acoustic "notch" filter at a specific frequency - I wondered if it is deliberately designed to reduce ringing from the metal tweeter....perhaps tuned at a specific frequency based on the depth - just like a tube trap or resonator only very small....