Audio Fix / setup help

FiiO R9: Remove intentionally added harmonic processing for comparison

FiiO R9 — Remove intentionally added harmonic processing for comparison. Follow the exact documented route and keep the actual result.

Manufacturer-documented Reviewed 2026-11-09 · Revision 1

Follow these checks in Audio Fix →

When this guide applies

Exact FiiO R9. Known Second harmonic adjustment at level 1 or 2; this compares a processing preference rather than diagnosing clipping. Only normal external user controls; no mains modification, chassis opening, reset or firmware installation.

Connection scope: Device controls / power only. Symptom: Playback sounds distorted.

This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.

If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.

Checks and possible outcomes

Start at scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.

scope

Confirm the exact setup

Is Second harmonic adjustment currently at level 1 or 2, and do you want to compare playback with that intentional coloration minimised?

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented FiiO R9 FAQ: System Audio settings ↗Channel Balance; Second Harmonic; Bluetooth Volume — Balance default is 0. Second Harmonic levels 1/2 intentionally add harmonic distortion; 0 minimises it. Bluetooth volume can be independent or synchronised; Sync requires support at the receiver.Exact FiiO R9, not R7. Installed settings must match the documented labels. · Source checked 2026-11-09

a1

Open Second harmonic adjustment

Open that option in Settings > Audio.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented FiiO R9 FAQ: System Audio settings ↗Channel Balance; Second Harmonic; Bluetooth Volume — Balance default is 0. Second Harmonic levels 1/2 intentionally add harmonic distortion; 0 minimises it. Bluetooth volume can be independent or synchronised; Sync requires support at the receiver.Exact FiiO R9, not R7. Installed settings must match the documented labels. · Source checked 2026-11-09

a2

Select Level 0 for comparison

Select Level 0 and keep the original setting recorded so your preference can be restored.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented FiiO R9 FAQ: System Audio settings ↗Channel Balance; Second Harmonic; Bluetooth Volume — Balance default is 0. Second Harmonic levels 1/2 intentionally add harmonic distortion; 0 minimises it. Bluetooth volume can be independent or synchronised; Sync requires support at the receiver.Exact FiiO R9, not R7. Installed settings must match the documented labels. · Source checked 2026-11-09

result

Check the actual result

Does the controlled comparison now match the intended minimum-harmonic setting?

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented FiiO R9 FAQ: System Audio settings ↗Channel Balance; Second Harmonic; Bluetooth Volume — Balance default is 0. Second Harmonic levels 1/2 intentionally add harmonic distortion; 0 minimises it. Bluetooth volume can be independent or synchronised; Sync requires support at the receiver.Exact FiiO R9, not R7. Installed settings must match the documented labels. · Source checked 2026-11-09

Possible result

Confirm the unknown detail first

Do not infer a source setting, installed cartridge, connector role, software state or partner capability. Obtain the exact documentation before continuing.

insufficient data

Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

    Possible result

    Keep the actual observation for support

    Record the exact model, source, input and last observed response. These checks do not diagnose a failed component. No reset, service work or blind update is prescribed.

    next support

    Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

      Possible result

      Checks completed — keep the observed result

      This records the observation in this particular setup, not a guaranteed cure, physical Audio Review test or measurement.

      steps completed

      Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

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