I like many reviewers here bought this to get a bit more volume out of my iPod Touch as this is a common problem for most users. The iPod Touch and other MP3 players do have a volume restriction built into them because of EU laws and that is why it always seems that bit too low.
First thing to note about this headphone amplifier is that it's primary purpose is to increase the volume of the device it's connected to. So if you're looking for better sound reproduction and bass etc then I would advise you to invest in a better pair of headphones. The FiiO E5 does have a bass boost button it and it does work but not with all headphones and the most significant difference you will hear when using the amp is the increase in volume.
You can buy many different headphone amps and this is one of the more entry-level devices and is reflected as such in the price. Having said that I am not at all suggesting it is poor quality, in fact the opposite. This is fantastic and you will notice a huge difference in volume straight away when using it.
It comes with two 3.5mm male to male cables for connecting to your MP3 player. One is a shorter cable with one of the jacks being right angled and is 22cm (8.5") in length, the other has both jacks straight and is longer at 84cm (just over 2.5ft). The amp itself measures 4cm x 3.5cm and 11mm depth. So, it's not very big then!
There aren't any pictures of the back but it does have a clip like the iPod Shuffle for clipping it onto your belt or pocket etc. The bottom of the amp is where you connect the USB cable that comes with it for charging and the input connection for connecting it to the MP3 player. The top is where the headphone connection is located, along with the volume up and down buttons, the power button and the bass boost slide button.
I've read that you can use this with a line out dock on your iPod for improved sound quality but I haven't been able to test this out yet as I ordered a new Sendstation LOD which has had a delay in delivery but I will edit my review once I have tested this.
I have tried this amp with a few different pairs of headphones and would suggest not using the bass boost button on higher quality headphones as it tends to give the effect of amplifying the sound in the right ear more than the left.
Overall this is a very stylish, compact and good quality product. It does what it's supposed to very well and is a fraction of the price of the more expensive audiophile-aimed devices out there. I would highly recommend this.
EDIT 5/4/2011: Well I have been using this headphone amplifier for quite a few months now and wanted to do a quick update as I have bought a line-out-dock (made by FiiO: FiiO L3 Line Out Cable for iPod). I would encourage any users of an iPod Touch to buy an LOD for use with the E5 as it really does improve the overall sound quality. Instead of using the iPod's amp and then going through the E5 (to boost the volume) via the normal connection method described earlier in my review, you can bypass the iPod's amp entirely and just use the E5 as the primary amplifier to power your headphone's sound.
So for maximum use try both the E5 and the L3 and you'll not regret it.
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