Today’s feature is a review of the FiiO E02i ‘Rocky’ which is an early-generation portable amplifier dongle capable of up to 70mW output power. It is priced at $29.99.
Disclaimer: This was sent to us as a sample in exchange for our honest opinion. Headfonics is an independent website with no affiliate links or services. We thank FiiO for their support.
You can click here to learn more about the FiiO gear we have previously assessed on Headfonics.
Note, that this article follows our current scoring guidelines which you can read in more detail here.
FiiO never tire of churning out great gear so this one came out under the radar a bit when they called to see what we thought of the E02i.
What is it? Is it another low-budget amp? Is it a gadget that looks like or is sponsored by Sylvester Stallone? Not quite. Let’s just say that it is a low-budget headphone amplifier for DAPs and Smartphones that’s just like Rocky Balboa in the way it punches above its weight class.
My sonic expectations when I first saw the little device were not that big. I actually thought it would be something gimmicky and useless unless one just wanted to boost the volume of headphones via smartphone disregarding sound quality. I turned out to be wrong.
I admit that I found the last Fiio portable amp that I tried (FiiO E6) to be quite good and didn’t think that the Rocky would be quite as nice since they are sold for about the same price while being metal in construction instead of the E6‘s plastic.
Plus the extra manufacturing cost of having to include a bonus feature for hands-free cellphone usage would mean that they would have to compromise somewhere right?
This thing is supposed to retail for $29 which is about the same as the FiiO E6 while having a nice metal construction plus the microphone for hands-free usage (which I admit I didn’t try since I don’t use a smartphone).
So where did they compromise? Well, as an amp, the FiiO E02i Rocky doesn’t really have its own volume control meaning they are not designed to be used with a line-level input.
What they are designed to be used for is with a headphone jack of any DAP or smartphone with volume control on their own.
If the FiiO E02i Rocky is used with a DAP or a headphone jack of a dac/amp with volume control like the headphone jack of the Fiio E10, the only buttons that work on the Rocky are the power ON/OFF and the bass boost switch.
The glowing blue button on the top and the up and down volume control are only for looks and might only work when used with a cellphone which I didn’t get to try.
Sound Impressions
So now how do they sound? Well, Quite good actually! The sound is on the same level of quality as the e6 with about the same amount of gain when comparing them at full volume on the different sources I used.
The FiiO E02i Rocky has a little bit of a brighter and crisper sound than the E6 though which might be a good or bad thing depending on the synergy of the headphones being used.
On my Beyerdynamic DT250 250Ω for example, the extra crunch on the edges was actually a good thing when paired with the slightly soft sound of low-budget sources like a Sansa clip or an old iPod.
The bass boost function on the Rocky also sounds cleaner than the one on the E6 which I didn’t quite like.
In fact, I hardly use any EQ or bass boost on any headphones ever but the FiiO E02i Rocky’s bass boost is actually a good thing when used with my Koss KSC-75 for walking/ exercising purposes. The bass boost switch on the FiiO E02i Rocky gives a good amount of extra bass without distorting as it does with some songs on the E6 when the bass boost is being used.
Our Verdict
So is the FiiO E02i Rocky worth $29? If you don’t already own a higher-end portable amp, I say definitely yes! Remember I am saying that these are already worth it before I have even tried the microphone for use with a phone so that in itself is already a bonus.
FiiO E02i Technical Specifications
- Frequency Response: 20-20,000 Hz
- Headphone impedance range: 16-150 ohms
- Cable Length: 800mm
- Power Supply: USB 5V/500mA
- Output power: >70 mW
