I own a Jadis DA50 signature, it is the best amp/preamp setup I have had for my Avantgardes UNOs, and I have tried and owned at least a dozen amps. Jadis sound is lush, fleshed-out, organic and very musical. You wont feel the need to chenge it in a long time, and since it is a Pure Class A design, almost any over 90dB spkr will make it.
Hope this helps you out.
Fernando
Hope this helps you out.
Fernando