I live in austria as Paltauf. It's on my radar as well second to Icon's 205D.
Musicalhead did in german though...
https://musicalhead.de/2022/02/14/test-paltauf-hpa100-sp/
I got the impression, since his #1 setup for quite some time (besides Aperio) is Sus+AIC10, that the
HPA 100 could be a sane choice for one who can't get a Riviera.
There is a german dealer who sold quite a few on ebay over the last year and one right now!
https://www.ebay.de/usr/vip-exklusiv?_trksid=p4429486.m3561.l2559
He sold many D8Kpros around € 2500.-
Thanks a lot for sharing, positive impressions indeed.
Power ratings are also impressive
600 ohms 1 watt
120 ohms 5.4 watts
32 ohms 20 watts
15 ohms 35 watts
8 ohms 70 watts