Best FiiO IEMs

Fiio FX17

• Gizaudio Axel: Warm, non-fatiguing listen.  Punchy mid-bass, warm, lush mids, smooth, detailed treble, wide soundstage.  Warm sound signature may not suit everyone.
• Super* Review: This is the best IEM Fiio has ever made. Very powerfull sound.
• IEMRanking AI: The FiiO FX17 is a 13-driver tribrid with a 10 mm lithium-magnesium DD, four custom Knowles BAs, and eight Sonion ESTs in a five-way crossover, housed in a polished titanium shell. It’s rated at 16...

Fiio FH19

• Jaytiss: A very pleasing Colorization, but not exactly what I love.

Fiio FX15

• Jaytiss: Unique tuning, but the switch would be better in the mids or bass.
• Precogvision: Odd recessions in frequency response lead to unique imaging but uncanny tonality.

Fiio FH7S

• Jaytiss: Warm done well, but not good enough.
• Precogvision: Warm and gooey with some sparkle. Relatively pleasant overall.

Fiio FA19

• Gizaudio Axel: Great resolution and micro-details.  Warm V-shaped sound with bassy lows, sparkly treble, and excellent resolution.  Bass quality could be better and treble is bright.
• Jaytiss: Nice All BA set!
• Super* Review: I can't recommend this IEM. Even if it would be 1/10 of it's price.

Fiio FH9

• Jaytiss: A different try on Reference.
• Precogvision: Pretty alright overall. Warm and reasonably well-balanced in the upper-midrange and lower-treble unlike some of Fiio's other IEMs.

Fiio FD7

Fiio FH5

• Crin: Stellar bass response and decent technical ability, not much to fault.
• Precogvision: Easily the best Fiio IEM. Warm, pleasant tuning with decent detail.
• Shuwa-T:  Clarity improvement over the FH3
• Nymz: Discontinued. Stellar bass response. Treble and timbre are a bit off, but still a solid offer and not much else to complain about. Detail is enough to keep up with the tunning.

Fiio JD7

• Jays Audio: A cheaper T5S with less sub-bass
• Drew / Audionotions: Really dynamic. Bass can be a bit much in quantity sometimes (for me) and upper mids can be a bit intense (at that line where things could be shouty but never crosses into that territory). Good note...

Fiio FD5

• Crin: Pretty standard V-shaped tuning though surprisingly proficient in technicalities.
• Precogvision: Generic Fiio tuning with metallic timbre issues to boot in the treble and upper-midrange.
• Nymz: Too V-shaped for me. Treble too hot and mids are very recessed. Great bass impact and stage size.

Fiio FW5

FiiO FH15

• Jaytiss: Not a fan. Lacks treble.

Fiio FA1

• Crin: A pretty standard reference-style tuning that just works.

Fiio FH3

• Crin: Does come off as sort of a broken FH5, but the FH5 elements are mostly there.
• Jaytiss: Bass, but at what cost? Everything.
• Precogvision: Bloated bass and general congestion issues.
• Shuwa-T: Comment: Bass boosted neutral tuning.  Narrow soundstage
• Nymz: My first IEM. Bad coherency and timbre. Good techs, bad tuning for my library. IMO, there are better and cheaper options out there.

Fiio FH7

• Crin: What is otherwise a pretty good hybrid marred by a strange tonality.
• Precogvision: Definitely one of Fiio's better releases. Warm and pleasing, would benefit from more air and bass also doesn't sound very DD.

Fiio FD3

• Precogvision: Too much 5kHz lends to unwanted sheen. Sounds like a Fiio IEM, not much else to say.

Fiio FH5S

• Crin: Varying degrees of "V-shape". Sounds like a regression from the original.
• Jaytiss: Not for those that are sensitive to upper trebble.
• Precogvision: A worse FH5.

Fiio FH1

• Crin: Surprisingly better tuned than its successor. Sparkly but non-sibilant treble with good bass response.

Fiio x Crinacle FHE Eclipse

• Jaytiss: I like it but it's a bit harsh in the treble.
• Precogvision: Sounds bloated and congested; bass surprisingly has little texture.

Fiio FP3

• Jaytiss: Can be a fun specialist