The E3 is a headphone amplifier, it is designed to improve the sound quality of MP3 MP4 Players, Computers or Mobile Phones when using earphones or headphones. It saves your player battery and lengthens the play time when playing music.
It’s not about Volume but Quality. A great pair of headphones can change you're listening experience--but only if they are driven well and properly powered. Put an E3 Headphone Amplifier between your music source and your favourite pair of headphones or earphones for an awesome personal listening experience right between your ears.

 

Features

l Designed for high impendence and low sensitivity headphones, with bass boost function;

l Small and easy to carry and use in the outdoors;

l Increase your music player's play time;

l Uses only one AAA battery, for 20 hours playtime.

Specifications:
Output Power                                      70 mW (32 ohms Loaded)
                                                            12 mW (300 ohms Loaded)
Signal to Noise Ratio                            >= 90 dB (A Weight)
Distortion                                             < 0.05% (10 mW)
Frequency Response                           10 Hz - 40 kHz
Suitable Headphone Impedance          16 ohms - 300 ohms
Weight                                                 11 grams (without battery)
Power Supply                                       1 AAA Battery
Dimensions                                           55 mm x 23 mm x 14.5 mm

Reviews from the famous headphone forum 'Head-fi' 

OK, just got the amp. It is TINY. I mean, really tiny. I don't know if pictures even convery the tininess of it. I've never seen a Xin Supermicro, but it can't be any smaller than this thing. Very nicely packaged, seems very well-made. Obviously, there's no volume adjustment. Between my Sony A818 and Ety ER-4Ps w/ S-cable, it sounds good, though I haven't listened enough yet to say how good. Volume-wise, the ER-4Ps without the 4S cable seem to have just about the same volume as they do with the amp + cable. Which is basically what I was looking for. So I can get the 4S sound with the 4P volume. Soundstage seems a bit wider with the amp, and a bit more bass as well, but those are based on very brief listening.

Two things are for sure: 1) I'll have no trouble fitting this amp in my shirt pocket or front pants pocket along with the A818 & 2) it was worth the price I paid!

                                                                                    　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　                                                                                             BY   sugarinthegourd

 

OK, I've done a lot more focused listening and here are my conclusions, based on my listening with a Sony NWZ-A818 and Etymotic ER-4Ps (with 4s cable):

• Volume with the 4s cable + FiiO amp is almost identical to unamped 4p cable, but sound quality is much better

• With the 4s cable, the amp adds volume equivalent to about 8 clicks on the A818 volume meter -- in other words, level 22 with the amp is about equivalent in volume to level 30 without the amp

• Comparing equivalent volume levels with and without the amp, I prefer the sound with the amp. Hard to pinpoint what exactly I like better, but it's subjectively better. Soundstage is a bit wider, overall sound seems a bit more precise and open. Bass is boosted a bit, but it's not overwhelming and bass is still tight.

Overall, even without the volume boost it gives me for high-impedence phones, I prefer the sound with the amp. Given the price, size and sound quality I'd say this is a no-brainer. If you need a volume control or power switch (power is cut by unplugging headphone jack) look elsewhere. But if you want a tiny, great-sounding amp at an amazing price, I'd highly recommend giving the FiiO a try.

One other side benefit for me: the headphone jack on the Sony is at the bottom, and I'd always kind of wished it were at the top. With the FiiO configured the way I have it, the headphone jack is now at the top.

P.S. I wish there were an apparent easy & reversible way of opening the case to see what's inside, but there doesn't appear to be. The size appears almost identical to Xin SuperMicro and I am wondering if they cloned that amp (without the Xin's volume control).

 

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　BY   sugarinthegourd

 

I got mine today (that was some fast shipping from Hong Kong! ), and I am not disappointed. The sound quality is as good as my uamp107. The sound signature, however, is different - the bass is more emphasized (which is not a bad thing when paired with the IM716). It is a huge improvement over the standard HP jack on my ZVM.

The amp is small (2.17' X .9' X .58'). I saw many pictures of it, and I was still surprised when I took it out of the box.

For what I paid for it ($13) well worth the 'investment'. It's definitely a winner in the SQ/$ category.

edit: dang! it's even driving my vintage K240's (600 ohms)

BY Kabeer

 

Got my today also. I will let it burn for a while before I give any impressions. It doesn't look like it has any big caps that need to burn in though.

EDIT: Can't help myself, will leave some short impressions anyway.

The fiio is (at least before burn in, but I do not believe that burn in will change much) not completely neutral. As other have stated, it definitely gives the sound more body. I especially belive that it has a bumb in the lower midrange as well in the bass. This makes it add just a bit of warmth to the sound.

BY  Henmyr