Anyone looking for a good budget pre amp for these monos I can recommend this for a few reasons, but xlr, a nice phono in with a remote and compact form factor are worth a mention. Oh, sub out and Bluetooth too!
www.tangent-audio.com
I’ve been running a pair of ZA3’s from it and all I can say is they’re a match.

Tangent PreAmp II
Preamplifier from Tangent with Bluetooth, Optical in, analog in, RIAA, XLR, headphone amplifier and much more.

I’ve been running a pair of ZA3’s from it and all I can say is they’re a match.