Their pro model throws in their highly resolving monocrystalline silver plated cables in 8 cores and uses Fiios version of their modular design. Leaving tuning aside, the FD3 sounds definitely upgraded since articulation is of finer quality, resolves better, it is more dynamic, fuller, more natural and has the upper hand on the soundstage.

Pick the large inner diameter tube (black) for detailed treble, and choose the small inner diameter tube (red) for robust bass. Just think: in 2025 you will get campfire solaris for 400uss and planar iem like audeze euclid will cost 200uss. The standard FD3 edition comes with a detachable MMCX cable, made from 4-strands of high-purity monocrystalline copper wire ending in an angled 3.

It's impressive how Fiio has considered the upgrade path for E7 DAC owners by integrating an iPod-style dock connector into the E9. They have strong treble energy, but manage to deliver a wet character treble that's fatigue free, which can be slightly splashy at times. While the outer diameter of the sound tubes is the same, the inner diameter differs for each sound tube.

The midrange of the FiiO FD3 has a mildly warmish tonality with a pretty transparent, airy and lively character. All in all, this is an excellent 8-strand 152-core Litz structure silver-plated monocrystalline copper cable that improve both sound and practicality. I thought the FH5s had some amazing bass and mids presentation but was debatable how the treble was tuned. T5 sounds more detailed, but also more harsh and can be fatiguing at times, having a more dry signature, where FD3 is smoother, more fluid and less fatiguing. Tesla magnetic flux paired with an ultra-fine copper-clad aluminum voice coil from the Japanese company Daikoku.The semi-open design of the FD3/FD3 Pro on FiiO's patented technology for balanced air pressure within brings several advantages.

FiiO's signature sound signature in the FD3 model continues its life, but acquires new shades and colors, due to new drivers, FiiO's constant experiments with internal cameras and cable materials. Bass on the FH3 is somewhat leaner but cleaner, tighter, better controlled with greater dynamic impact and layering.Thankfully in this case I did notice some improvement, which was further aided by switching to the wide-bore bass tips (despite the naming of the tips being somewhat counterintuitive here).

FiiO brings a lot to the table here, especially in its stellar build, generous accessories, natural timbre, percussive bass, invitingly warm midrange, and fairly refined treble for a budget single DD. The FiiO FD3 is a quite efficient In-Ear Monitor thanks to an impedance of 32 Ω and a sensitivity of 111dB/mW. The sound nozzle has an “Interchangeable Sound Tube” design that we have already seen on the bigger brother FD5.FD3 is remarkably good with pretty much any music style, and I wouldn't say that they lag behind with any style, even Rap and Grind sounding fun and even addictive with them.