FiiO FT1 and FT1 Pro Official Issues: Loose Pivot Screws and Low-Frequency Distortion

Manufacturer-confirmed issues
SPL-FII-FT1-001 — manufacturer-response
SPL-FII-FTP-002 — manufacturer-response

FiiO has publicly acknowledged two separate quality issues in the FT1 series. The company describes corrective production action and free after-sales support, but SoundPath Lab has not found independent post-change verification sufficient to mark either issue resolved-verified.

SPL-FII-FT1-001 — early-batch pivot screw loosening

FiiO states that the problem was “completely resolved” in production from November 20, 2024. That is a manufacturer resolution claim, not independent verification. Buyers of used or older stock should not infer the production date from purchase date alone.

SPL-FII-FTP-002 — low-frequency noise or distortion

FiiO notes that the sealed front cavity created when the headphone is worn can damp the behavior. This does not prove that every reported noise is a defect; evaluation should be performed while worn and under repeatable conditions.

External sample evidence reviewed 16 October 2026

These earlier measurements add context to SPL-FII-FTP-002; they are not SoundPath Lab tests or verification of FiiO’s later service program.

• Pragmatic Audio, 8 December 2024: Jerome O’Flaherty compared two FiiO-supplied samples, one pre-release and one retail, using KB501X pinnae and a 711-clone coupler. He reported pronounced rattle with a loud 30 Hz tone on the pre-release unit, improved behavior on the retail sample after a reported damping change, and increased retail-sample distortion above 100 dB SPL. FiiO’s private explanation is relayed by the reviewer, not a separate public service finding.
• Unheard Lab, first published 23 November 2024: sai reported bass clipping around 98–100 dB on a personally purchased pair, while explicitly leaving design limits, sample variation and quality control unresolved. A 5 February 2025 edit mentions further reports without enough device-level information to count them here. The author’s repost is the same evidence, not another independent sample.
• DIY-Audio-Heaven: Solderdude reported low distortion at 90 dB SPL referenced to 1 kHz, no compression to approximately 95 dB SPL, and about 1 dB of lowest-bass compression near 100 dB SPL on that fixture. This is useful counter-context, not proof that every unit is unaffected.

The samples, fixtures, seals, signals and level references differ. These thresholds must not be averaged into a universal failure point or incidence rate. None establishes serial or batch boundaries or independently verifies a repaired unit. The issue remains manufacturer-response; the separate pivot-screw issue retains its own ID and unresolved verification limits. Do not reproduce high-level test tones for this purpose.

Buyer guidance

• For FT1 or FT1 Pro, inspect the pivot screws and holder before the return window closes.
• For older or used stock, ask for production-date evidence if the seller claims it is from the revised run.
• Test FT1 Pro at sensible volume while worn; do not use dangerous SPL solely to provoke driver excursion.
• Record the track, frequency, channel, volume setting and whether the symptom repeats before requesting service.
• Do not generalize either issue to every unit; FiiO describes limited scope but gives no incidence data.

Verification and unknowns

Confirmed: FiiO acknowledges both phenomena and describes production/service actions.
Unknown: serial-number ranges, failure rates, regional stock mix and independent verification of the post-November 20 production claim.
Not claimed: no safety recall, product-wide defect rate or universal failure has been announced.

Source

• FiiO: Explanation and Solutions for Issues Related to the FT1 Series Headphones — official manufacturer notice dated February 14, 2025.

Revision history

• 16 October 2026: Added three attributed external sample contexts and their limits; status and earlier history retained.
• August 8, 2026: Initial publication; separated the pivot-joint and FT1 Pro low-frequency phenomena into distinct issue IDs and retained manufacturer claims as unverified resolution statements.

Related: Product Issues & Limitations · FiiO FT1 vs FT1 Pro Buying Guide