So far my current amps drive them best ever Paul. They are AirTight ATM3 monos , ATC2, ATE-2 with ATH3 full set up. I love them. They can drive them any speakers with full flavour of tube and SS slam in to it.
As per SS , The LFD NCSE MKII was the best I ever heard.
HI Honeyyooi , I used the EAR868 in my system and it was little too mushy to my ears. The ATC2 sounds more detail with more punch to it but without losing any tube sweet sounds. I would highly recommend it especially with AirTight amps .