My SoundLabs are currently being driven with a Threshold S500II amplifier, which was recently updated by Jon Soderberg. The preamp is a Krell KSL-2, recently updated by the Krell factory.
Your method of setting the sub levels with electrostatic speakers is interesting; I’m willing to try the procedure.
I’m not sure that I understand your drawing. Are you saying, for example:
• If width of room = 14’, distance between speakers = .7×14 = 9’10” ?
• If length of room = 20’, optimum listening area = .3 x 20 = 6’ ?
• The speaker toe-in = 30° ?