Ok, i just received my Ety ER4s, and they're wonderful, BUT there's something that's been bugging me. I know that they are 100 Ohms, compared to the 32 Ohms of my sr325's. This means that i should have to turn up the volume a bit more on my amp, right?
My normal setup would be something like:
ct570 -> jmt cha47 -> sr325 (volume at 8-9 o' clock)
Now it is more like:
ct570 -> jmt cha47 -> er4s (volume at 10 o' clock)
The default (no sound) setting of the V pot is 6 o' clock.
That is normal - for a roughly equal perceived loudness level. The ER-4S isn't particularly efficient, so an amp is recommended. And you'll have to turn up the volume a bit higher with the ER-4S than you normally would with Grados.