You have a Beta22? That's great. I tell you sir, I first tried my new out of the box pair of HE500s with my Rudistor RP010B amp with the stock cable unbalanced and I couldn't stop listening.
It may have been the best new-phone experience ever. I sure would try them with your amp no matter what else happens.
Edited by rgs9200m - 11/15/12 at 9:42am