650 and 800 are easy to drive - both 300ohms but the sensitivity of both is high enough. But looking for a good pairing for 800 is harder than with 650.
The VERZA is good for general use, but not for anything over 150 ohms in my opinion.
I'm interested to know how to get a battery pack if I decide to go for the Nova amp? I can see you're based in the UK, can you tell me how you were to get ALO Pan Am from the states?
Thank you very much for the information.
Thanks for getting back to me on this. I'll try and get a listen to one.