Pros: 1) Wide soundstage
2) Upfront, Bold and Dynamic Sound Signature
3) Great with orchestral music and bassy pop songs
4) Details
5) Great cable for the FD3 Pro
6) Lots of useful accessories in the package
Cons: 1) A bit uncomfortable to wear (personal)
To Note : My review is strictly for Fiio FD3 Pro and strictly based on my use with Hiby R3 Pro Saber DAP. FD3 Pro was brought with my own money and hence the review is completely my own unbiased thoughts
I have recently brought a Fiio FD3 Pro and paired it with Hiby R3 Pro Saber Dap (through 2.5mm balanced port).
The sound that came out of the FD3 Pro through my set up was big, bold, energetic and detailed to keep it simple . I used the stock red tubes with small vocal tips and also tinkered a bit with MSEB tuning in the Hiby. However, I never touched the equalizer.
The mids of the FD3 Pro (through my set up) was forward, warm and lush. Bass was punchy and strong but never overpowering the other frequencies (as was your experience through the stock nozzle) . The treble was smooth yet still detailed but not sibilant. Some of the best music I enjoyed through the FD3 Pro were music with large amounts of instruments (orchestral music mostly) and also energetic pop songs. As far as soundstage is concerned it is more wide than deep. I could easily distinguish between extreme left, left, centre image, right and extreme right. Imaging within the soundstage was pretty good as well.
Edit: I tried the black tuning filters. They made the sound too bright for me
Some tracks I listened to
1) AR Rahman music (Mudhalvan, Alai Payuthe, Jeans etc)
2) Durum - Kate Linn
3) Casanova- Allie X
4) Beat the Devil's Tattoo - BRMC
5) Animals - Maroon 5
6) Sgt Peppers Lonely Hearts Club Band - Beatles
My MSEB settings for Fiio FD3 Pro
Bass Extension: +15
Bass thump: +10
Note thickness: +10
Vocals : +10
Female Overtones : +15
Air : +15