If these are the specs for the Fiio E11...
1, Replaceable battery ( compatible with NOKIA BL-5B)
2, working voltage: +/- 4.5V or +/- 6V;
3, Voltage Gain: 10 dB;
4, Volume control: Alps potentionmeter;
5, OP: AD8397;
6, Output power: >150mW;
7, Case: Aluminium alloy
8, Playtime: 10 Hours
9, ETA: March, 2011
And if these are the specs for the UHA-4...
- Max output power:
- 20 mW into 16 ohms
- 40 mW into 32 ohms
- 50 mW into 100 ohms
- 15 mW into 300 ohms
- THD, A-weighted:
- <0.025%, 1 mW into 32 ohms
- <0.025%, 1 mW into 100 ohms
- Dynamic range, A-weighted:
- 93 dB, USB input
- 102 dB, analog input, 32 ohm load
- 108 dB, analog input, 100 ohm load
- +10 dBV max into high-impedance load (>600 ohms)
- Frequency response: 13 Hz to 22.5 kHz, +/-1 dB
- Op-amp supply rails: +/-5 VDC
- Battery life: 24 hours typical
- Enclosure: aluminum
- Dimensions: 3.3″ x 2.75″ x 0.47″
Then which has the most post power? I don't know how to read this stuff! Thanks for any help!
(I'm looking to bring the most out of the Sennheiser HD251-ii, which have an impedance of 70)