midrange forwardness

Sometimes it can be as easy as moving your speakers a bit forward from your listening area

Chris,

ATC will give you close to the best "electrostatic sound" with a tilt towards the lower midrange that is missing on some panels. Not as perfect in the midrange as you can get from the best panels but overall much better dynamically (not laid back) and an excellent all round choice because of the bass and treble. Gordon Holt used large Soundlabs for many years and more recently got active SCM 50's. Both are excellent speakers but ATC is more dynamic and forward, and seems to have more emphasis in the lower mids (male vocals come out very realistic).

Get a parametric equalizer.

Hi Dazzdax,

I haven't personally heard the Soundlabs or the Gruensch amps, but most electrostatic speakers have an inverse relationship between impedance and frequency or at least they rise in the bass and likely drop in the treble. If the Gruensch is a SS amp, it's possible your bass and lower midrange would be leaner while the highs more pronounced. If the Gruensch is typical tube amp, disregard what I just wrote.

Good luck,

Jordan