@soix I have tried swapping L/R cables, also done all the fq sweeps and phase test through tidal to dial things in. It is in fact in phase, have tested it so many times. One thing that did throw me off was that the L/R test is backwards!! Now that I know that, all is good.
Also tried different inputs on my pre-amp, different cables, none of that made a difference. Both the pre & power amp have been fully restored by me last winter, replaced like 250 parts in both. They are in tip-top condition.
As a last resort, put in another set of speakers, new KLH Model 5, same thing.

