Review of the Final Audio A4000

The Final Audio A4000 impresses not only with its comfort and fit, but also with its sound. Released in December 2020, this model developed by Final Audio brings several innovations compared to what is found in the brand’s B series, such as the Final Audio B3, which I own. Overall, it is a very user-friendly earphone for long listening sessions, as you will see in this review.

Build quality of the Final Audio A4000

The build of the Final Audio A4000 feels carefully designed to provide an excellent level of comfort. Both the earphones and the cable are lightweight, and even after hours of listening to music, I experienced no discomfort—something I was initially concerned about due to the pointed areas of its body (housing, shell).

Although the A4000 has a body very similar to the B3, there are some differences. Its tips are more rounded, with smooth curves. As a result, I did not feel the earphone structure “digging into” the concha of my ears.

The cable, although simple, has good flexibility, is lightweight, and does not tangle easily. I can coil it without difficulty and did not notice its weight interfering when worn over the ear—something that can happen depending on the material used.

There is a pair of cable hooks to help guide the cable behind the ear. I did not feel the need to use this accessory, although it does show the company’s attention to user comfort.

The A4000 uses a 2-pin connector instead of MMCX, which has been adopted in several Final Audio models. However, this is a proprietary connector, and I was unable to use third-party cables—only the one provided by the manufacturer.

I noticed that even though standard 2-pin connectors have a similar structure, the traditional type has a bulkier plastic housing and longer pins than the connector used by Final Audio. As a result, I could not insert the connector at all.

Like many other Final Audio models, the A4000 comes with the brand’s own case, made of flexible rubber. The case is compact and easy to handle, but I had some difficulty securely closing the lid.

Sound of the Final Audio A4000

The Final Audio A4000 emphasizes the upper mids, treble, and upper treble, showing excellent performance in instrumental and percussion music, as well as tracks that mainly feature string and wind instruments, with strong high-frequency activity and cymbals. There is good extension and natural timbre in the high frequencies.

The mids of the A4000 sounded neutral to me, blending well with the rest of the frequency spectrum without being recessed or forward. In addition, I did not notice any masking issues in the midrange caused by bass activity.

The bass and sub-bass have a good presence and prevent the music from sounding dull. However, I noticed a certain lack of mid-bass, which is the region responsible for giving low frequencies a sense of “body.” In my interpretation, the A4000 does not deliver bass that fills the room.

I believe that due to its reduced mid-bass presence, the A4000 is able to produce a presentation that conveys a greater sense of space between instruments, making the sound feel more “airy.” The emphasis on the treble also helps highlight this characteristic even further.

Conclusion

The Final Audio A4000 has a very distinctive sound that I have not found in any other in-ear earphone. Its sound signature favors treble, delivering a high level of detail and very natural timbre for instrument sounds. In addition, its comfort and fit are excellent, comparable to what I experienced with the Sennheiser IE 200.