You are looking at the dust cover in that picture, which is intentionally pulled in with four felt washered fasteners. That can be seen here:
So the tension doesn't really come into play, it's a mechanical warping of the dust cover.
Sheldon
There is something I don't understand. Putting ear near good treble panel I hear voices clearly in front. In repaired panel it is hard to tell. First check with Chesky test CD stereo imaging was ok. I think I must check with microphone and impedance what's going on.
Do you have the phasing wrong? is the center section wired out of phase to the two side sections?
I always mark the rear wires with a black band so it's easy to not get the phasing wrong when attaching to the crossover, does One Thing do something similar?
Sheldon
I always mark the rear wires with a black band so it's easy to not get the phasing wrong when attaching to the crossover, does One Thing do something similar?
Sheldon
It's custom build (not mine) tweeter panel with two blue and two black wires. Three bass panels stacked vertically with new cascades - must check internal wiring.
I compared tweeter panel wiring with good speaker and found middle section was swapped (front to back). But this don't change SPL level.
One Thing Audio asked for EHT picture. After seeing their unit, they said that will send another panel because last received (above) is not up to spec.