Okay a really long review.... Soo just trust me!
I'm a music producer soo i know the sound when i listen to it.
I was have beyerdynamics dt990, audio technica ath-m50x. In IEMs I have kz zex pro, tripowin mele, fiio fd1, kz zs10 pro, moondrop aria.
Now idc about the comfort and quality and all (FYI its comfortable and has premium quality) so let's get into the sound..

Technicalities:
Soundstage: 8.9/10
Resolution: 8.3/10
Imaging: 7.9/10
The soundstage is really good... Like if this is ur first iem then after listening to fd3s for the first time u might think it's narrow and it's not good but comparing all IEMs in this price range this has the best soundstage maybe it competes even with few higher priced IEMs. I used VE avani dongle so yaa.. dongles matter.
Imaging and resolution i mean it's good but don't expect tooo much cause it's gud according to tuning.... It's a fun iem so yaa

Sound:
Treble: 8.8/10
Mids: 8/10
Bass: 9.1/10
Keep in mind i used "black nozzle with vocal eartips"! With avani dac
Now first and foremost, u need a dac to use this don't listen to all other reviews.. u will get a hissing sound if u connect this iem directly to devices.. so i recommend dac.. any dac that's upon u, avani is cheap and i use it for this iem so it's a gud choice.
Now let's start with bass.. u will get rich super punchy bass.. very rarely it bleeds into the mids that too if u listen in high volume.. everyone will enjoy the low end bass of this iem.. there's nothing else to say
Now treble, actually believe me i didn't expect a good treble in this iem after looking at tuning graph.. but the treble is actually good. It's not like aria or know balanced IEMs... But for a fun iem it's really good.. if u r worried that treble will be compressed and clarity will suffer... Don't worry it's nothing like that! And It's far from fatiguing.
Mids:
Okay I'll be honest the mids can be better there is less body.. i won't say there's no body in tuning... But I'll say there's less body..... Again u won't lose any mids... Mids r present but they are a bit laid back..
Overall for sound I'll give 9.4/10..
Why?? Cause it's versatile and it's a tuning which 99% people will like and the soundstage damnnn is soo good

Tips:
1. Buy a dac any good quality cheap dac will do
2. Experiment with nozzles and eartips to find ur sound.. don't decide the sound with the nozzle and eartips which come default...
My recommendation black nozzle and treble eartips
3. If u have more budget u can get tripowin or any other cable... Fiio fd3 default cable is a little bit tangley
4. I don't think i need to say this but i will...
Listen to good quality song file... Flac or wav or apple music lossless

Okay soo my conclusion just buy justtt buyyy.... U will love it!!
(Burn-in is not required as it is a high quality dynamic driver but I'm still buring it so i can't tell u about that)

Why FD3, in the world of wireless and even no mic?

Quite simple. Sound quality. No wireless tech can come close to the wired ones. Especially since you can plug it in with good DACs. I already have a entry level DC02. Though entry level for audiophiles, its atleast 10 times better than what you get with your mobile phones, barring the LG phones that is(which are extinct now). Was tempting to go with FH3, but I did some research and could see this is has a wider soundstage than that, though overall sound quality is better in that. Also, this might sound a bit unnecessary but the FH3 looks cheap while this one is better built. And I already have been using the 1more triple drivers for over 3 years and its right channel stopped working hence got this. This time didn't want to go with triple driver configuration again(FH3), wanted to try something new

The sound quality is better than my 1more triple drivers. The details are better here. 1 more used to sound slightly muddy when compared to this. This one is one step ahead. Its not perfect. Has lot of treble. Tried reducing it in equaliser but that impacts originality. Usually its better to keep equaliser flat to allow earphones full freedom to express themselves. But you will get used to it. Doesn't sound harsh as such. Not balanced sound definitely v shaped but without sacrificing the tiny details. Maybe the FA1 could be more natural and represent sound exactly as is but might not be fun without bass

My take on Headphone Zone
Ordering and delivering experience was fantastic. Had a personal touch to it. Really liked it.
Headphone zone site specifically caters to the speciality in headphone buying. This is really great and interactive you even have professionals who can advise the best for you. Other giants handle all products hence could not have much of a focus driven approach. These guys are phenomenal. If you care about your music, you must come here. lots of products here are exclusive and you can't find them anywhere. i mean how many people know what a dac is. it's for niche crowd and even being a beginner doesn't matter. you can even buy headphone cables here
Am hoping we can also have a Speakers zone where we can specialize on great speakers - Like from Polk Audio/Z263/JBL studio monitors etc

My take on Fiio
If you look at the product catalog of Fiio, you will understand these guys take music seriously. They have FA series focused on balanced sound, with only balanced armatures. They have FD series for V shaped excellence while not compromising on vocals by virtue of using best quality dynamic drivers. Then they have the FH series which combines both. Then we have focus on the quality of cables(which you can buy separately and use it on your headphones), which can make huge difference in sound quality. So if you notice, their mindset and approach is purely focussed on sound quality and no fancy features. This speaks for itself. This aspect drew me in and I am sure people who are interested in pure sound quality and not just for show-off, will understand

What about higher priced models
Ofcourse they will sound better, but at this price point based on your budget, this is a bang for the buck. I believe at 1.8k, the KZ have a hybrid driver which could be best at that range and at 5.7k the Fiio FH1s would also be great. Note that these are all hi-res certified. - They can play from 10 - 40k khz range

I am loving it. The bass is amazing. The mids, highs and lows are all balanced and can be tweaked by using an equaliser. The build quality is great. Using it with Tempotec DSD

Just close your eyes and order

Everything is perfect

It's look amezing too

I had doubts about this website but after the purchase I can attest on the behalf of all PRO RES Listeners and audiophiles You have landed on the perfect website because it has variation for every range of earphones which suites you perfectly and fits your budget. Earphones are original and as described on website and its very exquisite in all departments. I am going to be a permanent and loyal customer after this beautiful experience.You are making a right decision if you are willing to spend a lot of money here.

First of all, kudos to Headphone Zone guys for shipping this fast! Always on time.

Coming back to the these pair of IEMs, here are my opinion:

Purchase decision:
Since my use cases are mostly listening to music while working and little bit of gaming, so was looking for something with which I don't have to fiddle with the equalizer much, but should also provide good enough clarity. Also, 2-pin connectors seemed they might bend if the IEMs are not stored properly, or if I fall asleep while wearing them, hence was looking for something with MMCX connectors. Shortlisted the Meze Rai Solo, FiiO FH3 (hybrid) and FiiO FD3. Unfortunately the first two went out of stock, and the FD3s semi open design caught my attention. Also the V-shaped sound signature seems more fun when listening during travels and commutes. And so a decision was made.

Inside the box:
Neat packaging, contains just about everything you need. Once you open the box, you'll get the IEMs itself attached to a copper core cable with 3.5mm plug. There's a case included as well which holds multiple set of ear tips: Balanced, Vocals, Bass, Foam. Has two sound tubes as well, red ring ones provide a tad bit of more bass (preinstalled), and the black ring ones accentuates the treble. Apart from these you also get a cleaning brush and MMCX assist tool.

Build Quality:
The IEM units are cylindrical and well built. They feel heavy on hands but once you wear them, you don't feel the weight. The wire also feels good and seems like built to last, but only time will tell how they fare. The MMCX connection also feels solid and doesn't seem loose at all.

Sound:
Out of the box, it's definitely V-shaped. But even with this characteristic, it doesn't feel there are overlaps in sound. The tone is on the warmer side and feels nice. Soundstage is on the narrower side. I'll breakdown the observations with the combo I've tried so far.

- Stock Setup: Red Tube, Balanced Ear Tips, Sound Source: OnePlus 7T + iBasso DC03
Great for Pop and Electronic tracks right out of the box. Tune the sound even more with a equalizer and these don't feel stressed at all. Mid needs to be lifted a bit, but whatever frequency you boost, the sound delivery is good with minimal bleeding (it's only there when you pay real attention).

- Black Tube, Bass Ear Tips, same sound source as above
These sounds just about right for Rock, Metal and Electronic. The bass guitars are clean, the hi-hat strikes are detailed enough. While the female vocals seemed fine, the male vocals tend to be on the warmer side. I'm using this combo for sometime now and enjoying every bit of it. And then, when listening to electronic and hip-hop, ramp up the bass in the equalizer and that 12mm DD shines like a star! And thanks to the opening in the chamber, you won't feel any pressure during long time usage.

Yet to test the other combinations, and I doubt it'll happen soon.

This is an easy pair of IEMs for those who wants to wear, sit down and enjoy their music. While these may not appeal to those who are looking for details in everything they listen to, this is an offering which will please most of the demographic.

Happy listening!
Regards.

Fiio FD3 delivered just at the right time when I required something to wake my brain up!! Don't kill me for saying that but feels overall better tonality than FD5, although FD5 excels at many other ways. Thank you HPZ for the prompt delivery.

P. S. I am using satin audio hybrid cable instead of stock one. Damn what a bass!! 🤯🤯🤯