He's impressed...but it seems like its not the amp for the very thing it seems marketed for: Sensitive iems. I'm disappointed; I was going to pick it up almost exclusively for sensitive iems. Am I the only one wishing that somehow ALO says there is something wrong with his unit?
http://ohm-image.net/data/audio/
"...With super sensitive earphones, there is little to no wiggle room from the amp’s off position to absolute balance between channels at comfortable listening levels. And this from an amp designed for IEMs. Through the Ultrasone IQ, I am uncomfortable listening to volume levels beyond that where L/R channels balance. Fortunately, channels balance almost immediately. Still, for my sensitive ears, it is too high.
And, while it’s not excessive, the Rx has a small amount of background noise that is audible through sensitive earphones. It is higher than competitors from Portaphile, Vorzüge, and select models from Cypher Labs. But, that noise low enough that many people may not notice it.
Apart from that, the Rx is superb. I’ve yet to find a load that stymies the strength of its signal. It doesn’t drop voltage in any frequency, maintains incredible stereo separation, and high dynamic range. Its ability to maintain strong stereo images in all frequencies is nearly unheard of. It’s an output that’s worth its weight in gold- that is, unless you primarily listen to insensitive headphones, in which case, its maximum output is meagre."
And
"End words
There are very few points against the current Rx. It is a superb performer. It is the smallest Rx yet. It fits the current ALO branding to a T. If only its base gain level was lower, it would be perfect for IEMs. As it is, I recommend it for all medium-sensitive IEMs as hands-down the best performance-for-value portable amp on the market.
Well done. "
