[calipilot227]

I use that exact combo in my portable and transportable rig (sources: iPod and laptop, respectively). It's a very neutral-sounding amp, and the noise floor is low (very little hiss).

With the UM3X, it sounds similar to the JDS Labs C421 (AD8620 version), but with the addition of a *very* good DAC. I much prefer it to the Fiio E11, which was a terrible match for the UM3X (tons of hiss, warm to the point of being muddy).

 

[AdamskaPrice]

Quote:

I use that exact combo in my portable and transportable rig (sources: iPod and laptop, respectively). It's a very neutral-sounding amp, and the noise floor is low (very little hiss).
With the UM3X, it sounds similar to the JDS Labs C421 (AD8620 version), but with the addition of a *very* good DAC. I much prefer it to the Fiio E11, which was a terrible match for the UM3X (tons of hiss, warm to the point of being muddy).

Does the DAC/Amp combo improve the SQ of the UM3x? Also, have you also tried fiddling with the EQ settings?

 

[calipilot227]

Quote:

Does the DAC/Amp combo improve the SQ of the UM3x? Also, have you also tried fiddling with the EQ settings?

 
Short answer: yes. The UM3X is highly sensitive, but the impedance is also relatively high for an IEM, making them especially difficult (although necessary) to amp. They need an amplifier that can deliver a fairly high current with low gain, and the E17 does the job quite admirably considering its price point.
 
I usually leave the EQ flat, but I'll sometimes EQ the treble up 2-4db if I feel like the song needs it.