Subject: ALO Rx IEM amplifier
ohmage: RMAA: ALO Audio Rx 24-bit
If your ALO Rx's gain is a bit too aggressive, contact ALO. They'll tailor it to your sensitive earphones. Or, if you need more gain, they'll do the same thing in reverse. And, as always, they've got a 30-day money back guarantee just in case.
Headfier 1TrickPony, has a load of good to say about ALO's customer service, which ends on this note:
Remember, the new Rx is one of the the most stable amps out there, and certainly is the most stable high-performance portable amp I've tested. As long as its gain is right for your earphones, it is a killer value.