I've been thinking about ordering the 1plus2 with the balanced kobiconn terminiation, but if it still hisses to the same extent it does on my IE80s (w/o impedance adapter), I don't think it'd be tolerable.
For some reason, without the 75ohm impedance adapter (Etymotic ER-4P to 4S adapter), my IE80 sounds weird/congested (along with the hiss) on the Rx MK3-B+ amp, but once I put the 75ohm adapter in-line it sounds "normal"... I wonder if the adapter simply is like raising the output impedance of the amp? :/
Are there any balanced impedance adapters for the Rx MK3-B+ amp/1plus2 that wouldn't change the sound too much but at least reduce the hiss?