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Originally Posted by shigzeo  great news for someone who wants a great amp. i can confirm that the bass isn't in the slightest recessed, even with the JH13Pro which give many amps a drop to -3-5 dbl in bass, a pop in the treble, and a hit in the mids. the Rx feeds down to 1 ohm meaning there is probably no iem in the world which will skinny down too much for it. if the lisa has added bass, that of course, is another story.
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Shigzeo, you have really nailed a critical element in the amp/headphone interface re IEMs. We all need to take notice re which amp we're using with these more complex impedance IEMs. We haven't seen a real impedance curve for these multi-crossover IEMs (ES3X in my case), but I wouldn't be surprised to see a significant depression well below their rated impedance. It's not unusual in loudspeakers to see an 8 ohm, rating but, under load drop into 4 ohms territory. My little AP Step's (4 ohm rated) dipped to 3 Ohm at some frequencies (NOT a good candidate for a tube amp, needing a good SS amp with plenty of current.)
The right amplifier will produce a more linear output, even if the impedance drops below it's rating. That is certainly true with my DNA Sonett and ES3X, with both ends of the spectrum leveling to match the midrange.
From what I've read re the ALO Rx, its PS may be the "leveler" allowing a more linear FR for the JH13 and ES3X.
Comments about the ES3X having an emphasized midrange are probably true, for a given amp. Pair it with something with some oomph, and it sings! Other's have noticed the same thing with the JH13's too.
Maybe you should start a new thread about the amplifier headphone interface?
.The comfort of the ultrasones is what am concerned with. By the way do you find the treble with the RX/X and ultrasone combo to be fatiguing when listening for long durations.
