I think we piezzo users needs way more flexible and smarter eq than our amps has. Do you know this? [Invalid or Expired Link Removed]
A great comparison, thanks for the effort.
You're right about the need for flexible EQ -- that Empress pedal looks good; I wish they'd build that into a preamp/DI! As far as on board EQ goes, I've found my TC Electronic RH450 has a good EQ for URB -- 4 semi-parametric bands. The "built-in" high pass filter is set a little low (15 Hz), and there's a bit of a gap between that and the bottom of the bass frequency sweep (71 Hz), but it's very useful for all that.
For the Realist SoundClip pickup, I set the bass shelf low down and cut, roll the low-mid control down and boost a little, and fiddle the high-mid and treble to taste (for the room, etc).
TCE doesn't seem to get a lot of love on this side of the board -- it's certainly not one of the hi-fi type amps generally favoured for URB, but for piezos, I think the rather more "old school" voicing and great EQ section (not to mention the 1 MOhm input impedance) works rather nicely. I imagine if I used mics, the story would be different. All usual caveats apply, of course.
FWIW, I also found the Aguilar Tone Hammer to be quite usable with this pickup -- the bass control is at 40 Hz, and it has a (single) semi-parametric mid. It also has enough juice to push any power amp, and also has a 1 MOhm input impedance. I'm sure there are many better preamps around for bass (could do with a notch and a high-pass filter, for starters), and one of these days I'll pick one up, but this does the job surprisingly well.