This is the area where things get much better. With the help of the new Knowles driver, mids sound blatantly better in every aspect. The F9 had a V-Shaped signature, but that is not the case with the Pro. By courtesy of a more effortless treble response and better tonality from the mid driver, mids now find the required space and freedom to shine. The tonality is especially much better and that is very easy to hear even during the first listening session.
Even so, the control is the biggest improvement in my opinion. The mids of the F9 contained a harsh peak on upper mids & lower treble, while this Pro version does not have such an issue. Even that alone gives you a much more coherent and a pleasing sound and it’s much easier on ears.
This is like jumping on a higher level IEM from a good one. Clarity, control, tonality, resolution, transparency… Everything you can think of, is improved with the F9 Pro. It preserves the good points and adds even more with its higher quality BA driver.
The F9 was peaky and aggressive with its lower treble response, but F9 Pro again irons that out with its much more controlled highs. This is a huge factor not just for the highs are concerned, but also for the whole sound reproduction. The smooth transition between the frequencies is very important in every IEM, and the F9 Pro is much more consistent in that sense.
Treble energy is just a little trimmed down for the sake of this consistency. But it still has very clear highs and the extension is similar. The improved treble quality effects many things, such as micro details, accuracy, texture and separation for the whole sound experience.
The positioning of the cymbals are very nice and distant enough to create a nice staging & image, together with the resolving character and good control. There is a slight roll off but nothing disappointing for the price level. I think the F9 did not have a noticeable problem with its upper treble, so the character on this part is quite the same, but the improved lower treble contributes critically to the F9 Pro to generate a consistent sound overall.
The clarity on the F9 Pro is simply very good for the money, and the new BA drivers serve absolutely great for the new -much improved- coherency. Also the mids are where they should be this time around, so the sound feels more linear and realistic. Resolution is quite the same and the F9 was already very good in that regard, especially for the budget level. But the F9 Pro contains closer vocals and instruments and that contributes very well for a resolving, balanced and smoother character.
Sound stage again is impressive for the money, although there’s no big difference from the F9. It’s not often to hear this wide staging and sharp imaging for this price. Channel balance is also quite good and separation is improved with the more consistent nature of the new BA drivers. Background blackness leaves good impressions once again with a nice, close to 3D feeling.
On the contrary, it’s still not the most controlled IEM around. When you crank up the volume to louder levels, you can hear that the control is not on a high level, and there’s a chance for elements of a fast song getting mixed up sometimes. Of course it’s much better and smoother than the F9, but don’t expect a TOTL speed, layering, separation and control from this IEM. The good thing is that, speed and dynamism are better than the F9 and that sometimes makes a big difference with certain genres/songs.
The FiiO F9 Pro has a sensitivity of 106dB and an impedance of 28 ohms. The values are the same with the F9, so it’s quite easy to drive.
This review already contains the comparison with the F9 in the context, so I’ll go on with other IEMs for comparison.
Shozy & AAW Hibiki: Hibiki is a single dynamic driver IEM, and gives an airy bass like the F9 Pro. But the latter has more punch and rumble most of the time, and has more midbass presence as well. Mids are very good with the F9 Pro, and as you know if you’ve read the Hibiki Review, its mids are on the thinner side and tonality is not great. So overall F9 Pro is the better performer. Even so, the Hibiki is a great value for the money.
LZ-A4: The LZ is outstanding in terms of bass and with its open back design it’s really atmospheric and has great stage depth. Mids and trebles are quite good as well, but that depends on the filters being used. The FiiO F9 has much better fit and isolation, similar amount of mid and treble succession and build quality is better to me, except that doubt on the MMCX connectors. This is pretty close to be honest, and I think the winner will depend on the person’s taste and usage habits.
Also FiiO’s own F1 and F3 IEMs are no match for the F9 Pro in any aspect, although the F3 is a damn good sounding IEM for the money.
Let me quote my own review about the F9 here:
“For 100$, you get a very solid IEM with a great fit and ergonomic design and also a great sound quality. The only big problem here is the lower treble, which I think FiiO could make better with more precise tuning. There will be a FiiO F9 Pro model soon, and James from FiiO says it has better control overall, so it looks like you don’t need to worry about the peak after getting that version.”
Well, this time for 139$, you get everything the F9 offers, plus a much smoother and controlled sound with better dynamics, precision and tonality, which is crucial in my book. Slight upgrades in terms of usage is the icing on the cake. What more can we ask?
I recommend everyone to skip the F9 and get the F9 Pro. It’s really interesting to see how much the brand of the drivers makes this kind of an impact on sound. What if you have the F9 already? No difference, I would still recommend the Pro version to you. I think FiiO could’ve released the Pro model directly as the F9 model, but I’m not making the decisions of course.
This is the best IEM FiiO have ever released so far, and I hope they continue to offer great value in this market.