The Sophia 3 has a woofer damping resistor under a cover plate at the base of the speaker. Changing this resistor to a higher value will reduce the woofer damping and allow it to produce a fuller bass at all volumes. Not sure about Sophia 2 or original. Worth it to check.
will changing to solid-state make the bass in my wilson sophias better at low volume?
I've noticed that my sophias really shine when they're cranked up a bit, which is great, but I'm wondering if I can't get more of that, esp. the bass, at lower volumes. my tube amps (Cary Slam-100s in triode) are ~50w/ch, more than the 25w/ch minimum wilson recommends. it seems to me that I could either get a sub or try a solid-state power amp. it'd be easy enough to try either/both, but I'm curious what people have to say. thanks!