Objetive recommendations for DAC/Amp portable

[vvs.angelo]

Budget: 150$ (sadly).
Format: Portable (iOS, Android and Windows)

Features to consider for my main earphone:
Etymotic ER4SR
Impedance: 43.9958 to 75.8971ohms (from 20.3hz to 16khz (frecuency response respectly))
Sensitivity: 98 db/mW

Loudness(dBSPL)--------Voltage(Vrms)--------Current(mA)--------Power(mW)

85 -------- 0.06 -------- 0.86 -------- 0.05

100 -------- 0.33 -------- 4.71 -------- 1.56

110 -------- 1.05 -------- 15 -------- 15.75

115 --------- 1.87 -------- 26.71 -------- 49.96

120 -------- 3.33 -------- 47.57 -------- 158.41

What should be considered objective in the measurements:
Lenient Limits:
Dynamic range, linearity: 96 dB
THD, IMD: -66 dBFS / 0.05%
Noise: -85 dBFS / 0.005%
SINAD: 85 dB
Crosstalk: -60 dBFS
Jitter: -110 dBFS, -100 dBFS around the main tone
Frequency response: ±0.5 dB
Channel balance: 1 dB
Output impedance: 2 ohms

Strict Limits:
Dynamic range, linearity, SINAD: 120 dB
THD, IMD, noise, crosstalk, jitter: -120 dBFS / 0.0001%
Frequency response, channel balance: ±0.1 dB
Output impedance: 0.16 ohms


EDIT: At the moment the only good DAC/Amp I find is the Fiio KA3 (with low TDH around 70ohms with good power too)

 

[Jimbob54]

To take power from the source device or battery?

 

[vvs.angelo]

To take power from the source device or battery?

Both (PC and iPhone)

 

[Holmz]

All the Eytimotics I have used have sounded great straight into the iPhone or iPad.
I suppose the AudioQuest dragonfly (or maybe firefly) would be OK, but the built in DAC is likely good enough.

I either loose the Etymotics or damage them so I go through a set or two/year.
And I would buy two of the IEMs and not worry about a DAC myself.