Those are the headphones I would need a external amp for, minus the SR1a’s. I don’t have those but would like to give them another shot. My first experience with them wasn’t ideal.
Don’t get me wrong, I enjoy my Luxman tremendously. Feeding it the Dave’s signal really ups it’s performance. I just have to let my ears readjust because it sounds so different than just listening to the Dave alone.
Gotcha...I'd definitely give the HPA4 a whirl...the reason I love it so much is that sonic purity PLUS the extra power.