Planars tend to sound best with a "bit" more power on hand.
While the Era-1 sounds good out of the V30 and Btr5 i own, they are not capable to deliver the rumble presented by my R28.
So to speak, if you want all the lows from the Era-1, you've to spend much more power.
It's really crazy how they'll change, especially in the lows, with a good amount of current delivered.
I'll stick to my CTH for now! Thank you!