I need to turn up the volume to get a decent ‘clarity’ from them.
Could be many things including your listening preferences. Could be that is the sweet spot for your gear. I’m running an Ayre AX-5 which has the same signal/noise ratio regardless of volume setting. But most preamps have a "best" sounding volume. Regardless, I’m reluctant to ascribe the effect to the Thiels.
BTW, stay tuned to this thread over the coming months. Tom Thiel is working on upgrades for legacy Thiel crossovers. The cs2.4 will be among the first tackled. The idea is to have DIY kits and/or upgrade service available through Coherent Source Service (Rob Gillum’s Theil service company). I expect these will bring sonic performance to a new level.