FiiOFD3 Earphones in-Ear Earbuds High Resolution 1DD Bass Heavy MMCX Connector (Black)

This is the non pro version. This is a good, well rounded IEM. I give it 4.5 stars. It is light and with the right size tip there is no comfort issues. It tends to be a bit on the bright side. Sound tube and bass tips tame it down to a good level. It delivers clean and crisp sound in all genres. The vocals and treble are very good. The bass benefits from amping. I use it with a portable amp (Fiio A5), with the bass boost on, and it improves the bass definition and power. I still feel the FH3 has a better more defined and beautiful bass. I was hoping they can reproduce that in the FD3.Compared to the FH3, the FH3 was bigger and felt nicer sitting in the ear. However both are extremely comfortable. Also the FH3 felt a bit higher quality perhaps because of it’s design. The FD3 quality is very good, it’s just the feel of the FH3 was a little more upscale. The FH3 has a better more defined and cleaner bass, but the mid and upper frequencies were too thin with my equipment. It also has some weirdness in the treble of certain tracks especially acoustics. The FD3 has none of those issues. The FD3 has full bodied mids and highs, a little less detailed but still very good. With the 2 different sound tubes and the different tips you can dial the sound to the way you prefer, or to the genre you are listening to and it makes a difference. The basic cable is fine. I heard the pro cable may make the sound brighter. I don’t know how true that is. I wanted mine to be on the warmer side because the DAC I use tend to be on the brighter side. I had returned the FH3 about a month ago because I could not love the vocals and the treble. I will be keeping the FD3.Update 11/25/2021:I have upgraded the basic cable to a balanced cable. If you are not using a balanced output you are not getting the most out of the FD3. Despite using the 3.5mm with a DAC dongle and a portable amp the balanced cable was significantly better out of the DAC alone! Everything sounds cleaner and crisper. The bass is tighter, there is more separation, the stereo effect is noticeably better. So this lets me enjoy the music at a lower volume. For reference I am using a HIDIZS S9 (not pro) and Tripowin Altea 2.5mm cable which is a nice thick cable. I use the red sound tube with the bass tips and it balances out the sound pretty well. I think the sound tubes are a major selling point as you don’t to have to be stuck with one tonality.

Amazing IEMs, not just for the money but in general. I own many “audiophile” headphones and these compare with the best of them. I wanted something with lots of clear and defined bass, while retaining detailed mids and crisp highs, and these deliver. I use the red sound tubes and vocal tips because they are the most comfortable and give the best, most reliable seal, which provides the best bass and sound in general. If you can EQ, then cutting out some 2.5khz and to a lesser extent 5.5khz frequency gives an even smoother high-mid/low-treble sound, as they have peaks in that range that can become a bit tiresome with certain songs. I also add a low shelf (bass boost) for some types of music and they can handle it like a champ. However, even without EQ they sound great although a little bright, but with the many different tips and sound tubes they’re customizable enough. Great value for the money I recommend to anyone who wants better sound than what even the best bluetooth earphones can provide, casual listeners and “audiophiles” alike.

FULL DISCLOSURE: I'm not an audiophile but I really like good-quality, clear and punchy sound. I can't demo a bunch of speakers and tell you which ones are 'warm' or 'flat' or whatever, but I can tell you which ones sound awful and which ones are great. These FiiO earbuds are my first experience with the brand and were purchased specifically to use with a Valve Steam Deck. (Bluetooth earbuds have too much latency.) I like them quite a lot, they pack a ton of quality sound for their size and they feel well balanced. Even the lows are surprisingly robust for such a small driver. They won't compare to a set of over-ears of course but they hit above their weight. They're also quite pretty, which is a bonus.On the whole I usually strongly dislike earbuds as I have extremely sensitive ears and ear canals and most earbuds and some headphones will give me significant discomfort and ear pain within an hour. These are quite good with the smallest tips; they're not perfect but they're among the best I've tried. It took me awhile to get used to the over-the-ear loop with the wire and even longer to remember which bud was L and R. (They're blue and red instead of being marked L and R.) The cable seems robust although it wants to tangle if you look at it funny.They're great quality earbuds and I'd definitely try other offerings from FiiO in the future if the need arose.

Sounded great but ultimately ended up returning for a few reasons. First issue for me was the fit, I tried different eartips that cane included and also purchased other but regardless couldn't get the best fit. The other issue I noticed is that since the nozzles can be removed/switched, I'd notice they would (with the slightest adjustment/movement) start unscrewing. This might just be a me issue because of the fit but I'd always have to tighten them due to them unscrewing. And the main issues I had: is that at times when connecting them to a dongle (my phone doesn't have a 3.5) they wouldn't actually connect. Like it'd say it was connected and I would press play on a song but no audio would be coming though, neither through my phone speaker or the iem but the track would be playing. Its not the dongle; I have 4 total so and I had the issue with all of them, and I tried different earbuds and they worked well with those dongles. And lastly sometimes I'd notice that the right earbud would sound as loud as the left earbud. Not sure if this had something to do with the nozzle unscrewing with the slightest movement or it'll its something else. I still have it 3 stars as I believe some of these issue might just be due to the fit for me and may not apply to others, plus the sound when everything was working fine was great.