rhythmnsound,
I’ll add that I’m a 50+years guitar player and both acoustic and electric guitar sounds are critical to my impression of authenticity.
All the Zu speakers do electric guitar via specific guitar amps unusually authentically. Soul Supreme will do that do. Soul Supreme is more amp-friendly for a wider-variety of amps due to its 16 ohms impedance and beautiful Radian 850 supertweeter that rolls off beyond 18kHz. The Soul 6 hides nothing but also reveals everything you crave. It’s quicker, punchier and delivers more harmonic air. But it won’t cover for trouble cascading from upstream in your gearchain -- nor from a terrible recording.
But if Quad ESL is your measure of sound, Soul 6 is the most unified, articulate, electrostatic-quick dynamic speaker I know of, except it delivers more tone.
Phil