I got tired of listening the Boom bench pretty quickly, and took a saw to it and cut it in half!
Pulled out the amplifier and turned the speakers back in a vertical position. Connected to the Audioromy FU13 the sound picture instantly found its place again. I guess I have found out the hard way why speakers are always vertical. I know I have read It so you don´t have to pester me with I told you so´s.
When the speakers are vertical the high frequencies which carry the positioning information, are diffracted in a horizontal pattern. That why!
And this is the absolutely last time I will listen to a cheap transistor amp. They Are Boooring.