FiiO E11 - Reviews
Pros: decently powerful, strong bass, long battery life, light weight
Cons: small soundstage, can get sibilant, slight hiss, can't use when charging
I bought this amp as my very first ever headphone amp. I bought it for my Denon AH-D5000 at the time, because even though it is very sensitive and effeiciant, my laptops audio jack still is incapable of outputting proper volume or impact (the internal amp chip must literally be putting out less than 1mW for this to be happening lol). So the E11 became the very first amp I got to hear as a reference point to what amps should sound like. Initially I was quite impressed by the sound, it was loud, the bass was super impactful on my Denons, and overall it felt like I was actually hearing my headphones in the proper way they were meant to be heard. That is until I started comparing the sound quality to my headphones plugged directly into the computer. See at this time I didnt yet have a dac, so whatever the E11 was plugged into was the dac (either my laptop, or my ipod classic). So I was very familiar with what the sound signature is supposed to be with both of my sources. The problem is that after going back and forth between my computer and E11 a few times, I noticed the E11 had a pretty noticeable drop in soundstage size. It was enough of a drop that it actually was becoming unpleasant to listen to music. It felt like the soundstage was a lot smaller than what the headphones were capable of doing (and its not like my headphones are the best at large soundstage to begin with, being closed back, and I wasn't using an external dac). Then when I used the E11 with my ipod I noticed the other major sound quality issue. It made the treble become a bit too sibilant on many more recordings than it should have. I use all lossless, and relatively well mastered music, plus I was familiar with how they sounded playing out of my laptop. So albums that normally sounded just fine, no sibilance at all, just maybe a slight brightness under normal conditions (out of the laptop) now sounded terribly sibilant to the point of being painful to listen. It didnt help that the ipod classic itself is slightly bright sounding, and that the Denons can be a tiny tiny bit too bright in the treble sometimes (usually its not thought, just sharp, but still enjoyable). So after a few weeks to a month of use, I just gave up on using it, because my laptop simply had the superior sound quality, even if it was less powerful and more quiet. I just couldn't enjoy music played through the E11.

Now there are some good aspects of it, and this is why I say It's a decent starter amp. The bass is really nice, pretty tight, lots of impact, and rumble. It has little distortion overall, and the EQ settings as well as the gain settings all work nicely, although I just preferred using it in the default settings, meaning everything on 0 EQ and low gain. Also the volume knob has a nice feel to it, and is pretty good at getting a nice volume level. Also the battery lasts for a very long time. If you only listen for a few hours everyday, then you can easily get a good 2-3 days out of the E11 before actually needing a recharge, but keeping it charged everyday is always useful.

Overall I'd say you pretty much get exactly what you pay for in that price range. Also I don't think the numbers for its output power are correct, because I was able to max out the volume knob with my 25ohm/116dB(around there) headphones without ever really feeling like this was too loud to keep them on my ears. Sure it was super loud and definitely not something you could listen to, but as a drummer I know what 110-130dB of volume sounds and feels like. This amp was not making my super effecient headphones reach those levels very easily. So I'm sure it could drive slightly harder to drive headphones, but I can't say it will do a good job of it in terms of volume. In terms of dynamics and being able to 'control' the drivers of a headphone, that it does pretty well. So I guess if you dont care/dont notice the small soundstage, slight sibilance, hiss, and ok output power, then this makes a pretty good buy for its price. Otherwise I would seriously just save up for something better, once you hit the $100 mark I'm sure theres plenty of much better amps. I bought this amp because of so many good reviews on its sound quality, and im writing this one because I want people to be aware of the potential disappointment this amp can bring if you have never heard or bought a headphone amp before. None of the many other reviews mention these same problems, but they are there.
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Excellent honest write up. I've been telling people for months E11 actually downgrades the SQ compared to the sources headphone out. I really don't understand how the amp gets so much praise. If you're willing to spend $100 then C&C BH is a much nicer sounding amp and runs for 80 hours a charge!
Pros: Clean sound with bass boost
Cons: Volume knob gets in the way of the in & out audio jacks
Hi guys. I'm a new member here on Head-Fi. I got to say, I fell in love with my music again from all the advice and suggestions in the forum. This will be my first review on my very first portable amplifier. I am no way an audiophile so bear with me in review. This is my way of giving back to the community.
My Gear
iPhone 5
Shure SE215
Grado s60i
The E11 is a really small device. It's 2/3 the height of my iPhone so carrying it around is really easy. Build quality is excellent considering it's price. My only gripe is the volume knob. Since both the in/out audio jacks are located near the volume knob, attaching cables is really annoying. Why? If you have L-shaped end audio jacks, they're going to either block the volume knob or overlap with each other because of the small spacing between them.
The thing I love about this amp is the replaceable battery. I think it's using the same model as those Nokia phones (BL-5B). I've had experiences with gadgets where you cannot replace the battery so when it's damaged or dead, you'll have to get it repaired or buy a new one. So I really appreciate the replaceable battery in the E11. I've been using this amp for a week now and I can say it can last you a day with casual use (riding the bus, listening at work, etc).
As I said before, I'm really new to this but I do compose music as a hobby so I have a decent amount of knowledge when it comes to sound. All I can say is that my SE215/s60i improved a lot with this amp. There are differences as the bass and lower mids are more defined and vocals are more clearer especially on the SE215. There are no distortions at higher volumes as far as I experienced. When I tried listening to my iPhone without the amp, I immediately noticed that it's lacking that enhanced sound that the E11 provides. It's kind of hard to describe in words. With the amp, songs sound fuller with more detail if you try to listen closely.
I use the amp daily when I'm commuting to work and has made my life more bearable. I even bought some 3M Dual Lock (detachable stickers & better than velcro) so that I could attach the amp to my iPhone for easy portability and remove it when I'm done. If you're a newbie like me and looking for an affordable amp, you can't go with the E11.  I think this is a great product and I highly recommend it before considering on buying the more expensive ones down the road.
I have had the E11 for years now and it is still working fine. I had to replace the battery at one point though. It is not working fine again. At first, I thought the E11 felt too lightweight and cheap and as if it would break easily but it has lasted so much longer than I thought it would. I used to use it a lot of the time as a portable amp and I also use it at home often. Even though it has loads of dents and scratches now, it still works exactly as it used to. I really think it is built well for being a portable headphone amplifier. I have dropped it quite a lot too and it still works.
I have always liked the design of the E11s volume knob. I much prefer dials to buttons for the volume although I have become used to the FiiO X3s buttons now. No matter how many different cables I have put in the E11, I haven't really found the volume knob to be in the way much at all. I agree that the right angled cable does a bit but I bought the FiiO L2 cable separately. I find this one much better than the one supplied with the E11 for connecting 2 devices together. It is a tiny bit longer (10cm) and it isn't right angled. 
I think that I will buy the E11 again once the one I have gives up. As long as you plug the E11 into a good source, I find the EQ on it more effective and clean then the EQ on my other devices. I even think the the E11s bass boost sounds even better that the Fiio E10. That is only when I have the E11 plugged into the line out of the E10 though.
I bought it for £35 and I think that was a very good deal considering how much it is not and how much I have used it.
Pros: Clean sound, accurate frequency response, can drive most headphones, good detail
Cons: Can't use when charging
Today I got scared a little because this $50 portable amp sounded pretty much on par with the O2 amp. Yeah, really, it did! 
I bought this thing last summer, and I didn't realize how good it was until I compared it to my recent purchase of the Objective 2 and my two vintage receivers. Bass is nice and controlled, mids and treble are right where they should be. Overall, a very nice balanced sound. And best of all, it can drive pretty much anything up to 300 ohms. It even sounds great with the Beyer DT 880 and Senn HD 580. 
For $50, this is a STEAL, highly recommended!
YEAUP, I liked my E11 for the longest time! It just works nicely 
my first amp was the E11 :p
really nice little amp, but i don't think that the dt880 sound great with the e11.
Pros: Plug and play, switchable gain, switchable bass boost.
Cons: no adjustable bass boost (just 3 settings) Distorts with bass boost set high at high volumes. A little pricy for quality next to a CMoy.
The FiiO E11 is my first professional headphone amplifier and I have to say it was rather unexceptional.
First Impression/ measurements:
The first out of the box impression was incredible. Nice matte black plastic leading to a metal like edge with a notch for the volume nob (very intuitive) I accidentally dropped it taking it out of the box but nothing broke and after further inspection it is really very sturdy.
I opened it up and looked inside to see if I could see any hardware. I was greeted by a battery and some concealing plastic unfortunately but I'm certain I could find what they used on their site. I replaced the backing and turned it on.
This is where I expected and issue because FiiO has been known in the past to ship dead batteries (which will decrease their life and maybe even make them unusable out of the box), but, to my surprise, the amp happily turned on and boasted a cute little blue light letting me know it was operational.
I then measured its output for DC offset. For those who don't know, high DC offset (above more than about 50 mV) can cause permanent damage to headphones. The measurements came back as 1 mV on the right channel and 0 mV on the left, which is a very good sign. I then turned on the different levels of bass boost (bass boost also boosts DC offset) and measured. The measurements all came back as 0 mV, meaning some compensation circuitry was most likely implemented here. This is actually quite nice and kudos to FiiO for making sure that this wasn't an issue.
Listening Tests:
Being excited about its good looks I plugged it in and set it off on a personal favorite mix of mine on soundcloud. It is important to note here that there was no equalization software used here as I wanted to get an impression off the amp on an average laptop with average settings. I will add an equalized test result later for those who wish to see it. I started it playing and noticed it was rather quiet. This was strange because it was set to high gain and the volume was all the way up. I realized that I had stupidly had the inline volume on my headset down so I turned it up....and nearly deafened myself. The FiiO (on 32 ohm high sensitivity headphones) gets LOUD. It started distorting at this volume which was strange because I know my headphones weren't maxed out. I turned the inline volume down again and (As a side note here This lowers dampening factor to the headphones as it adds resistance before the speakers (bad thing) but this shouldn't cause the kind of distortion I noted from the FiiO) It sounded as if the little happy amp was getting rather cranky now turned all the way up with high gain and bass boost all the way up. I just tried to recreate the problem with low gain and was successful. Even at low gain it cannot handle the bass boost all the way up and volume above 6.5 (8 is max). To ensure that this was the amp I turned them all the way down and slowly edged them upward to make sure it wasn't the extra resistance causing issues. As I expected, the distortion stayed the same from lowest to max volume (It sounded like it was running out of current to push because on bass hits it got scratchy) As another side note: It just died and is charging now. If anything changes when the product is fully charged I will be sure to change my review.
Along with this issue of distortion I noticed that the bass boost, even on the highest setting, was rather modest. I've experienced better boost with software equalization on a mobile device. This was a deal breaker for me because I was really looking forward to the extra oomph it would give to bass without equalization. 
Bottom Line: It isn't a bad amplifier and looks slick and clean, but it has a few issues here and there that make it a little bit of a bad deal.
I give it a solid 3 stars and would recommend it as entry level equipment to people who want mobility and a little extra volume.
Pros: Sound
Cons: Battery/power management, unable to use whilst charging
This ticks so many boxes, with high quality amplification able to drive difficult loads,(it smooths out the low end in my Audio-Technica ATH-M30s enough to make them listenable), great size and weight, excellent volume control, and hardware switches for bass boost (it doesn't need it, but it is there) and output gain.
But there are a few design features that make it a deal breaker for me: I have one, like to listen through it, but rarely do because:
  1. The unit cannot run whilst charging through the 5V USB port. So if you aren't charged and ready then you 'aint using this baby. I know it is likely to improve battery life, but major problem for me.
  2. The unit drains considerable power when switched on, even if there is no signal voltage at the input. If this is turned on and doing nothing, the clock for 10 hours keeps running. Don't use this amp to go to sleep listening to something, or you will be out of juice in the morning (something I routinely do)
My only other minor gripe is the mismatch between the size of the unit and almost every mobile audio device excepting the older long ipod nano means the supplied rubber band method of clamping to the audio play is not useful. This is begging for a velcro fix method on most devices.
So with a few tweaks, I'd likely think this was an exceptional buy. It probably still is, for the amplification quality and the money, but for what I use it most often for (amplifying my go to sleep music) it suits very poorly.
Edit: (either not yet allowed to comment, or cannot figure out how to reply to comments) Reconsidered rating, added another half: I bought this in Australia when it was hard to find any retailer selling a Fiio, hence the high price, but as I said, despite being a great amp amplification wise, it sits idle on my shelf 99% of the time because of these flaws. I may as well not own it at all.
I can understand your frustration, where on earth did you pay $130 for an E11... I paid $50 for mine and yes the power issues are annoying but for $50 it sounded great and I could have cared less, I still don't feel -2 stars for power manegment is any where close to fair... but if you paid $130 for yours... then I can understand your frustrations. May I how ever suggest you try to find your self a used JDS Labs C5, I found it to be a clear step up from the E11, and it's around $150 ish used or so! I think you'd enjoy it [and yes you can charge and amplify with it at the same time] and it has a bass BOOST 
Pros: Subtle and detailed sounds, great price
Cons: build quality
This is my very first portalble amp, ever after my purchase of the great TDK ST-800. Results are surprisingly good and capable of driving my older Sennheiser HD overheads and the newer ST800
Too bad the left channel died quickly. The first solution was to change to a newer DIY silvery cable. However, the second came too soon and could not be saved with two more cables.
Pros: Powerful clean audio with good portability and build quality
Cons: Takes quite a while to charge (3+hrs) and can’t be used while charging. If you have a decent portable player, you may not notice an improvement.
Overview/Design (9/10)
This is primarily designed to amplify sound out of mobile devices that do not get loud enough for you, either because they are low quality, your headphones are not sensitive enough, or you’re going deft :). As a bonus, it has a built in bass boost with 3 settings (off, 1, 2). It also has a good quality easily replaceable Lithium Ion battery (BL-5B), and comes with the mini USB charging cable and 3.5mm to 3.5mm audio cable. Also in the box are two silicone bands of different sizes to attach the unit to the back of your mobile device.
The unit has 2 LED lights, a blue one that comes on when powered, and a red one for charging. The power switch is built into the volume knob. You know it’s charged when the red light goes out. For those who plan to use this as a laptop or desktop amp, note that it cannot be powered on (blue) while being charged (red). It also has a high/low output switch.
The unit is surprisingly small and light, especially considering the power output. It is well-built with high quality plastics. The volume knob is metal and requires a good amount of force to move it, and I never had a problem of the volume changing while in my pocket. Battery life for me was between 8-9hrs average, but varies based on volume. Giving it 9/10 because it could still be smaller, and the mini USB port is being replaced by micro USB now as the standard. It would also be nice to use it while charging.
Sound (8/10)
Sound wise, it does what it’s designed to do exceptionally well. It’s mainly noticeable due to higher volume, but the bass boost works well, and it gets loud and stays clear without distortion all the way up. I did not test the AMP with high impedance headphones, I only own moderate to low ones myself. When connected to my Galaxy Nexus phone, with various headphones (Q350, HD-25 II, SR60i, HD558) the difference was night and day, but mostly due to the lack of power output of the phone. Bass boost is nice to have on mobiles that don’t have that built in.
However, when connected to my Sansa Clip (Rockboxed), I couldn’t really tell the difference when listening at my usual volume. That being said, the Sansa has plenty of power to drive any of my headphones to satisfying levels. I never really go beyond -12DB volume on the Sansa alone. I also found the bass boost less satisfying than using the built in bass adjustment on the Sansa. I still give it 8/10 because it does very well for poor quality sources like phones.
Verdict (8/10)
[size=11.0pt]If you already use a decent quality portable that gets loud enough for you without distortion, and has built in bass boost or bass/treble adjustment, you will not notice much improvement. If you plan to use this as a desktop or laptop AMP, look elsewhere because you can’t use it while charging. If you have low sensitivity headphones you want to go portable with or you have a portable player that does not sound good or loud enough (like most phones), you will love this product. If your deft or like to crank volume in general, I highly recommend this. In my personal case, the Sansa is more compact to bring along with my Phone than the Fiio, but I still use the Fiio when my Sansa dies. So I still find it useful. But keep in mind the Sansa Clip is under $40, so it presents a cheaper way to get better sound on the go. Because there are portable players that are much smaller and produce comparable audio for less, I give it 8/10.[/size]
I was thinking in buying one of these, you definitly made some good points in your review.
Cons: Need additional equalizer options and a robust finish like the E17
Hello Bass Heads,
I use my V-Moda Crossfade LP and V-Moda Remix remote with my iPhone.
They sounded decent. 
Got the FiiO E11 shipped today. Works like charm. Crisp n clean sound.
GODDDDD!!! Even the crappiest tracks(the ones I usually skip) in my playlist sound AWESOME!!
The FiiO E11 makes your BASS headphones sound EXCEPTIONAL
Pros: Light, Powerful, great battery life, smooth volume knob
Cons: bass boost level two muddies up the sound, cheap feel
[size=small]So this is my first portable amp that I have purchased. Prior to this I have used my receiver headphone out, outs from too many mixing consoles to name and my portable champ my iphone. Needless to say that the iphone is the worst out of all that I have used, sounds like booty to honest.[/size][size=small][/size]
[size=small]First Impression (looks):[/size][size=small][/size]
[size=small]The amp is tiny. It fits with room to spare in the palm of my hand. The amp has a matte finish from which fingerprints will be attracted to in disgusting ways. The two click buttons that are on there (EQ aka bass and Hi/Lo settings) feel a little cheap. I was actually afraid that I was going to scratch the plastic finish as I have to use my nails to switch anything because of their size. The buttons are tiny and it is hard to tell when you are in the first EQ setting or on the way there. EQ zero and two are easy as they are at their respectable extremes.The volume button is smooth once past the "click" of on. It's made of metal which gives a nice tight smooth grippy feel when turning the volume. This thing weighs 2.3 ounces and I gotta tell you that I thought it shipped without the battery. It is that light. I had to open it to make sure that the battery was actually in there.[/size][size=small][/size]
[size=small]Turned the amp on with nothing plugged in and all I heard was the fact that I was plugged into an amp. Being around much more powerful amps it is nice to know that the operating noise that I get from a $6000 QSC amp is the same that I get from a $59 headphone amp. Immediately, I began listening to uncompressed music as the "Garbage In Garbage Out" rule applies more than ever when amps are involved. Ask the off key singers.[/size][size=small][/size]
[size=small]I used my custom molded UE 5's from Ultimate ears. I will be purchasing the Hifiman HE-500's as this amp is more than capable of pushing them. My UE's have an impedance of 21 ohms which my iPhone can play with not much success. The first thing I noticed is the sound stage. It is much wider than using no amplification. The center feels very focused.[/size][size=small][/size]
[size=small]Low End (bass) - The amp on EQ setting zero plays music as it was mixed which is typically what you need on a well mixed album such as Bob Marley's orignal mix of Could you be loved. On EQ setting one is where the punch of the low end comes in. Forty hertz from Linkin Parks Numb come through clear enough to rattle my ear drums. It is enough to fill out your needs without blowing you out of the water. The EQ two setting should not be used. The low end seems to remain the same while the low mids (150 - 300) get a boost. The only thing that I found this setting to sound good with is one reggae song. It does not sound bad but does muddy up the sound.[/size][size=small][/size]
[size=small]Mid - This is where this amp impressed me. Mids that are implemented well are silk on one's skin, like apple filling to your pie if you get my drift. The way this amp pushes the mid levels is truly amazing. I had to keep checking to make sure that this small amp was what was reproducing the sound. I can't say enough about the way that the mids make me feel. GREAT!![/size][size=small][/size]
[size=small]High - This is generally where everyone wins or loses in my book. Consider the high end the pie crust to my apple pie. Too much of it, and it takes away from all of the hard work that the low (crust) and the mids (filling) have done. Too little and it gives you a taste yet leaves you wanting for more. I am on the side of not enough on this amp. If it had just an 'nth more I would probably never take this amp off from my headphones. The high end is there not sharp, not dull but could be brighter.[/size][size=small][/size]
[size=small]Hi/Lo (Outside casing) - Important to note that there are two Hi/Lo gain settings. One on the outside which in my opinion widens the sound stage slightly larger and boosts the mids yet keeps the high end sharp without cutting into your brain. At the same time it would be nice to have a touch more highs to make the sound better rounded. The bass sounds untouched. That being said switching from Lo to Hi does not kill you with POWER!!!! It gently raises the levels without hurting your ears by introducing sharp highs or ear splitting high mids. Good to have but not necessarily that important when on the lo setting (internally).[/size][size=small][/size]
[size=small]Hi/Lo (Inside Casing) - Also important to note that on the Hi level on the inside that your battery life is cut from ten hours to somewhere around four. All listening prior to this was done using the lo setting. On the high setting the amp sounds so much bigger but not in an obnoxious way. Music of all kinds sound much more full bodied and in your face. The bass boost on EQ 1 is where its at. You have no need to go above this simply because of how growly the low end sounds. Depending on how well the mix you have is kick drums punch you in the face and the mids and highs soothe you.[/size][size=small][/size]
[size=small]My negatives to take away: Could use more high end, and ACTUAL level two for bass that could punch out your teeth rather than a mid booster. Wish they didn't use plastic that attracted fingerprints. Bigger buttons on the side for the EQ and gain settings.[/size][size=small][/size]
[size=small]Overall, my opinion on this amp is that it is absolutely AMAZING for the price. Great first amp that has WAY more power than I will ever use (until I get my HE-500's).[/size]
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Pros: durable, small
Cons: white noise, feedback
Audio Quality-some white noise. Feedback when strapped to iPhone.
Quality-Very durable and small.
Design-You cannot use it while charging. It also is easy to bump the volume know when in your pocket.
It came with a dented battery cover. It wouldn't quite close. FiiO sent me a new battery cover, no questions asked. They also gave me a free FiiO t-shirt. Very satisfied.
I had the same problem with feedback when i got this amp. It's caused by interference from the iPhone's signal. If you turn on airplane mode the feedback goes away completely.
Pros: Adds a great body and HiFi feel to the sound. Light and portable. Great soundstage and stereo separation. Bass adjuster.
Cons: Poor battery life. Plastic construction feels cheap. Dock cables are a tad expensive.
Great amp for the money, in my view best FiiO has done.

This is my first amp and really I'm quite shocked at how much the sound quality can improve by just carrying one extra little box.

Battery life and construction could have been improved, but of course that in turn would have added more weight.

I'm sure I will try the E17 in the future, but for now E11 is amazing and fits my needs perfectly. :D

I'm actually considering buying another one for backup, they are on offer at an amazing price at the moment on Amazon:
How does it compare to the E7? Or the E17?
The E7 is cheaper and is more focused on quality. The E11 is focused on gain, and compromises in many areas to achieve that extra gain.
At least, that's what I've been told.
Lifted Andreas
Lifted Andreas
E7 is also a DAC which means it can be used with your PC or Laptop. E11 is purely for portable ampliftication, and has better sound quality according to many reports.

My guess is that the E17 is a step up from E11, so it will be my upgrade sometime next year. For now I'm so happy with my E11 that I'm gonna buy another one next week.
Do you have a link for a cable that would connect this to my Galaxy S4? Thanks 
Sound: They expanded the soundstage a noticeable amount as well as instrument separation between the 2 channels. However, at first listen on the standard music app, i found the vocals to be a little muddy or low end heavy. Not enough treble to bring out the details of the instruments or the singer's voice. So I tried using it in conjunction with the EQu app and to my surprise i found it worked alot better. I increased the treble to bring out the details better but with that brought less bass than i really wanted. So I put the amp on bass boost 2 and high gain and now they have a pretty solid impact in the bass without losing the detail of the treble. Now the only thing that would make this amp sound perfect is if it could bring the mids/vocals a tiny more forward in the sound spectrum. I could adjust the mids in EQu, but the result made them sound not as clear- it went back to the result of just having the amp playing through the standard music app.   7.5-8/10
Build: Decent. Since I got it used it was a little dented but hardly noticeable. the cover to the inside of the amp was backward when i got it, so i had to switch it back and even then one of the corners stuck out slightly. So even with the plastic exterior showing some wear and tear, i am confident the E11 won't up and break on me too easily.     7/10
Overall: These are my 24 hour initial impressions. So I can't say this is my definitive conclusion as only time will tell. But for now, I'm giving it a solid 7.5/10
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Judge Buff
Judge Buff
+1 for the cable upgrade... Makes a world of difference.
sagar khichi
sagar khichi
how much difference is there in the sound department from the original studio sound
I cannot find cable replacements anywhere for it
Pros: Great price, good sound, gain and "EQ" switches
Cons: Sum hiss/hum audible on highly sensitive IEMs
I agree, great amp for the price.
yes that is true !
Pros: Clean, Lean and Multiple Settings (Extra Battery & Charger Included)
Cons: None really, but opening/closing the case is funky.
I purchased my E11 bundled with an extra, larger capacity battery and a charger off of Amazon. The additional items added a miniscule amount to the total, but greatly increased the overall value for me. It also negates the biggest gripe that folks have about the E11, which is not being able to use it while charging. Opening the slim cover without fingernails or a guitar pick (or the like) isn't all that easy and closing it makes the cover flex a little, which is a little scary. Nothing has happened with it... yet.
If you are using the headphone jack on your portable audio source, this amp may transform your mobile audio experience greatly. I use it with my 1st Gen Zune 30 and a host of IEMs and 3 full-size cans (JVC HARX900, Shure 440 and Superlux HD681). I only use an LOD for the cans, but both outputs are viable for IEMs. It has three bass boost settings (0,1,2) two power settings and two gain settings to adapt to your phones' impedences. It pays to experiment with the settings if you aren't impressed with your initial sound. Fits in a pocket, even strapped to the old Zune... Very clean, very powerful and very adaptable. I like it a lot.
Had mine a week now. Loving it. What exactly did you buy to change the power arrangement? I'd like to to the same.
Pros: reasonable cost
Cons: none noted
Brand new to the whole world of portable amps, but a really long time hifi addict.
Bought this unit on recomendations of others online, and am not disappointed. I have nothing to compare it with of course. I am waiting for a converter to use it on my iPod proprietary slot, so I have tried it only on an Android phone and a Sony MP3 player. I have a variety of headphones, from Sennheiser to mee to Koss, and I must say the sound improvement is quite noticeable. Very pleased with the features, ease of use and available output improvement.
My relatives ordered a fiio e17 and i ended up with this one :frowning2: , im sending it back though
Good purchase- I own and consider the E11 to be the best value available in a portable headphone amp. It is clean, goes really loud, is light enough to use while exercising and I love the bass boost.
Pros: Great Clear Sound, Great Bass Boost
Cons: Thin Plastic Cover, Can't Play While Charging
A great amplifier at an affordable price.
Highs - Crisp
Mid - Good and Clear 
Bass - Tickling 
Overall - Will make you Feel the music with a big Grin while walking back home. Anytime! 

What about the hissing?
Until now, i didn't really experienced any hissing..
Pros: rechargeable battery, great bass boost, plenty of power, outstanding price/performance ratio,rotary volume
Cons: can't charge and play, cover is a little thin,doesn't come with LOD cable
For a complete in-depth review you can hit my page where I've gone over this in detail.  I just wanted to list the pros and cons above and leave my feedback here with the star ratings so it can be added to everyone else's opinions.  For the record though, I don't think there's a better price/performance portable headphone amplifier on the market.  Just a crazy good value for a rich and powerful sounding amplifier.
No question - the E11 is heads and tails better than the E6. I've not done a full writeup of the E6 as of yet but it's really not even close. The bass is controlled and also the boost doesn't leak into the midrange on EQ 1. EQ 2 bleeds into the mids just a tad and in some cases is too much for some headphones to handle. But, there's no question that the E11 is a superior amp. Is it worth 2x the price? In my opinion yes.
ok, do you still require to turn on graphical equalizer in your music apps with iPhones or any software equalizer when listening with this device ?
I don't use any EQ other than what's on the E11 when it's plugged in - partly because the headphones I use don't really require any EQ'ing and occasionally I just want a nice bass boost and the E11 provides all that I want!
Pros: Nice Build, Brilliant Bass, Over-The-Top Volume Control, Ease of Use, Long Battery Life
Cons: May Destroy your ears if you turn it up too quick
Relatively short review, but here goes. (I'm using the Ratings as a Section Template)
NOTE: This is the only amp I have ever owned, so it may be biased!
I bought this amp about a year ago now, and I must say first off that it is fantastic! People say that the FA-003 doesn't need amping, but I really felt a difference immediately after plugging it in.
It's as if the sound just became clearer and had more power. It was really quite astounding for someone like me, who has never used an amp before this one.
As a bonus! It has a bass control. It's not that customisable, it's only OFF, 1, 2. But I find it to be more than enough. I practically never use the 2 setting (that's for bassheads, i'd say), but I do like to use the 1 setting when I want more "Oomph"
The bass that is added is well done as well - it doesn't muddle the rest of your music at all!
-Build Quality-
The first thing you will notice about this amp is that it is mostly made of metal. It's not going to break easily. The only thing that may be fragile is the jack. The jack broke for me after about 4 months constant use - Granted it was in my pocket and I wasn't exactly protecting it, so overall, i was careless!
I actually tried throwing mine, after the jack broke, on the floor with moderate power. Nothing really happened; some of the plastic got scratched a bit and it lost a bit of paint, but apart from that it was intact.
All in all. This thing is a TANK! (as long as you aren't careless with the jack - I recommend an angle adapter if you're using a full-sized set with an un-angled plug)
Let's be honest, this thing is beautiful. It's sleek, has neutral colours, and the shape of it is brilliant for travel. It's a little bit smaller than the average smartphone, but it's about the same thickness (In fact, mine was mistaken for a phone twice.)
There's not much more to say - The design is eternal and beautiful.
This thing costs nothing. Not in comparison to what it gives, anyway. Spending the $65 on this vs. Spending an extra $65 on a headphone - I would say that the FiiO wins most of those battles. It just adds so much life to your music!
Pros: Powerful and slimm
Cons: Volume knob
There has been a lot of talk lately about affordable portable amps. Coming from using high end portable amps in the past I was quite skeptical. I thought that there is no way a sub 200.00 amp could compete with RSA and Headamp. I had the same mentality towards portable amps as I did towards customs. I guess I thought that if you could not afford the big boys then you really did not need an amp. I have seen so much change in the portable music industry in the last six years I have been a member here. Amps and customs were for the elite audiophile and that justified their price.If you wanted to Join the club you had to pay.
Let me give you a little of my background gear. I have tried several high end portable amps over the years. I started with the RSA hornet. I was so thrilled those many years ago when it was released. I was so amazed at the sound it could produce through my Custom ultimate ears. Shortly after the Hornet was released Ray came out with the Tomahawk. Hey a smaller portable amp that could perform better yet more battery life. I jumped on the wagon. As soon as I jumped purchased the Tomahawk Justin from Headamp posted about this new dac/amp called the Pico. Man my world was spinning around, I had to have it. Now I could use a dac to improve my pc sound and then take it on he go with my ipod. I was so thrilled with this amp till Ray posted about his new ultra small amp called the P51 Mustang and its Dac/amp counterpart called the Predator. I managed to hold out on this amp until recently. I have been enjoying this amp for a few weeks now.
Well with all the talk of affordable amps lately, I decided to contact Fiio and ask a few questions about their idea of providing cheap amps to the community. I thought it was another Chinese company trying to rake in the bucks on the efforts of people like Ray Samuels and Justin W. I thought this was tragic. I thought it could leave a bad impression and possible drive new audiophiles away from the hobby because of a shoddy product. When Fiio offered to send me an e11 and a L9 ipod LOD I agreed. I thought I would finally be able to differ people away from this product and protect them. I promised to give a honest review no matter what my biased beliefs were.
Well two days ago I received a package from Hong Kong by DHL.It took about four days to arrive which is quite good seeing as they did not send it express. There was a small box enclosed in the DHL envelope. Within the box there was some styrofoam protecting a small silver box about the size of a wallet and a small static envelope.

The silver box contained the E11 amp, a 3 inch 3.5mm to 3.5mm interconnect, short usb mini cable, and a silicone band. It was packaged quite nicely and accessories were great. The anti static bac contained the L9 right angled LOD.

The construction of the amp is mostly plastic.The volume knob is an ALPS potentiometer. They do this to ensure a low noise and good channel balance. There is a built in high-performance lithium battery. It is a BL-58 model. Basically that is a cellphone battery that can be easily replaced To one side you see five 220 16v RVT solid state capicators. Underneath the battery you see a switch to change from high to low power.

As you look on the outside edge of the amp you see gain switch and a 3 position eq switch. The other side has the usb charging port, and the front has the volume knob, input and output connectors. There is a blue power led and red charging led on the top of the unit.

The frequency response is 10~1000Khz. Signal to noise ration is ≥98dB. Crosstalk is 60dB. Gain ≥ 12dB High, and ≥ 6dB for the low. total harmonic distortion is <0.009%(10mW). Voltage on high is 300mW(16Ω), 200mW(32Ω), and 35mW(300Ω). Voltage on low is 120mW(16Ω), 88mW(32Ω), and 13mW(300Ω). The recommended headphone impedance is 16~300Ω, and the input impedance is >5KΩ.
The size is quite acceptable for a portable use. It is quite thin and light. It measures 92.55mm x 54.2mm x 13.4mm and weighs 65g with the battery.In my opinion it is easier to slip in the pocket than the p51 and ipod combo.
The L9 lod is a right angled 3.5mm connector with a low profile 32pin connector. It uses two 6cm PCOCCA-A copper wires with PFA insulation and a cotton rope medium surrounded by a black TPE sheath. the impedanceof the wire is a max 0.07Ω and has a resistance of min 2MΩ.

I have been listening to the amp almost constantly for the past few days and it has about 30 hours on it. The battery lasts between 10 and 12 hours. and takes about 3 hours to charge. I was using my ipod classic 7g with ALAC and 320 KB/ps files. Iems I used were my ultimate ears ue-5c, ue-11 pro, and jvc marshmallows. I will use other iems as I get them in shortly. I was unable to use fill size cans as I don't have any on hand currently. I used many genres of music from Loreena Mckennitt to Disturbed. Basically every genre other than country. 
There are a few things I don't like about the amp. I don't like the how the volume knob was designed. I understand that they did this to prevent accidental operation of the volume knob. When the unit is piggy backed with the ipod it is very difficult to manipulate the volume knob. They could help prevent this by including some sort of feet to attach like RSA and headamp do. This would provide a bit more room between the amp and the ipod. I also feel that in this configuration the L9 is not suited.

I do find the amp provides more than enough power for my iems and probably enough for full size cans. With my ue-11 pro I have the volume on 3 with a low gain and no eq. I would be afraid to turn it up any louder or put it on high gain as it would cause hearing damage. In my opinion it should be able to power most any iem or headphone out there you would take portable. There is plenty of detail and separation in the music. There is a strong punch in the bass and really tightens up sloppy bass. For the most part I dont use the eq, however I think it is a good idea for someone that does not have their desired bass in their cans. you can use a flat iem to listen to classical music and then add some bass to techno or rock to make the same iem fun.How does this compare to high end amps? Well the p51 has a larger soundstage and a bit more accurate bass and detailed highs.I think it would be quite hard in a blind test to tell this was not a high end amp.
The L9 is not a bad lod for the price ( around 20.00) there are a few things that could be better. I dont think the right angled connectors suit my current needs. The LOD sounds good. It is a bit warmer than the RSA lod I am comparing it to, but is more flexible.The 30 pin connector is a bit loose. It wiggles in the line out of the ipod and a little too easy to pull out. You can just lightly pull on it and it releases. I worry the connector can come loose when removing from my pocket.
In conclusion Fiio has opened my eyes. It is quite possible to provide a great product for an affordable price. There is plenty of power to amp most any can and has a great sound. I do prefer aluminum housings over plastic and would like a different knob or silicone feet, but this is a solidly built portable amp with great accessories. I love the silicone band they include. It is a good amp no matter how much the price tag is. I have no problem recommending this amp alongside the Pico, P51, and the likes. I do feel there are better amps out there but at 3x-5x the price.
The L9 on the other hand is different. I feel it could be a lot better. It has great sound but I just cant get over the connector. I would like to try a different LOD from them and see if it is better or suits my needs more.
I bought some silicone bumpers and it seemed to have fixed my problems.
can this be used with Triple Fi 10 earphone ?
Thanks for the solid review!
Ive been wondering for a while if the increase in sound quality is only caused by the use of the lod cable or if sound quality would also be increased while using the 3.5mm out on the ipod.
If anyone knows how this works please let me know.
Pros: Lovely smooth sound for hardly any money. (£40)
Cons: Volume knob isn't properly fixed to the potentiometer spindle; it has a little bit of "give".
Well, "impressive" doesn't even come close...
I have a Sony NWZ-X1050 which sounds awesome through my car stereo, my home stereo and, of course, the noise-cancelling earbuds that came with it. The problem is that I don't like earbuds.
The only pair of working 'phones in the house at the moment is a pair of Sennheiser PX200 cans. These are renowned for having very little deep bass and, because they're so small, the isolation is practically non-existent.
Not any more! I amped them through the E11 and now, not only are they loud enough to drown out any extraneous external noise, but they actually have whump and rumble! They have some bass at last, and very smooth it is too.
I wish the weekend would hurry up and get here - I can't wait to go out and get some proper cans...
My only gripe with the E11 is that the volume knob has a little bit of slippage on its spindle, though because of the design of the case, it isn't going to fall off, so I can put up with it.
[EDIT] I've since purchased a FiiO L5 LOD Cable to go with the amp. It's very nicely put together, too. It has nice thick cable, and both plugs feel solidly attached. 
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Makes me not regret my decision to buy. (ordering tomorrow)