Audio Fix / setup help

NAD C 389 / NAD C 399: release a confirmed Mute state at a safe volume

release a confirmed Mute state at a safe volume. Exact NAD C 389 or C 399, normal operation with the intended input already selected and Mute explicitly shown. No protection warning or unknown fixed-volume cinema chain.

Manufacturer-documented Reviewed 2026-11-10 · Revision 1

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When this guide applies

Exact NAD C 389 or C 399, normal operation with the intended input already selected and Mute explicitly shown. No protection warning or unknown fixed-volume cinema chain.

Connection scope: Analog line / headphone audio · Optical digital audio · Coaxial S/PDIF digital audio · HDMI / ARC / eARC audio. Symptom: There is no playback sound.

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

Exact NAD C 389 or C 399, normal operation with the intended input already selected and Mute explicitly shown. No protection warning or unknown fixed-volume cinema chain.

Look for: Confirm the stated setup or visible result. Stop if it is unknown.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 389. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10
  • Manufacturer-documented NAD C 399 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a1

Read the indication

Confirm the front display actually shows Mute. A silent input without that indication needs a different check.

Look for: Mute is positively identified.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 389. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10
  • Manufacturer-documented NAD C 399 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a2

Keep level low before restoring output

Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands.

Look for: A safe output level and AMP control target are confirmed.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 389. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10
  • Manufacturer-documented NAD C 399 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a3

Press MUTE once

The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.

Look for: The Mute indication clears; observe actual playback.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 389. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10
  • Manufacturer-documented NAD C 399 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

result

Check the actual result

Has Mute cleared and is the known source audible at the verified safe level?

Look for: Confirm the stated setup or visible result. Stop if it is unknown.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 389. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10
  • Manufacturer-documented NAD C 399 — manufacturer instructions ↗Owner manuals p.10, SR 10 MUTE — Confirm the front display actually shows Mute. A silent input without that indication needs a different check. Confirm the remembered/current output setting is safe. If it is unknown, do not release mute into an unknown system. On the SR 10 select AMP for amplifier commands. The manual specifies a second MUTE press to restore sound. Replay the same known source without raising the volume to compensate for silence.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

Possible result

Checks completed — report the actual outcome

The stated observation was confirmed in this setup. Completion is not an automatic Solved report, a hardware diagnosis or a physical Audio Review test.

steps completed

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

    Possible result

    Keep the observation for support

    Record the exact model, source, connection and last visible result. Do not reset equipment, open its chassis, bypass protective limits or install firmware to compensate for an unconfirmed result.

    next support

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

      Possible result

      Confirm the unknown detail first

      An unknown indication is not a diagnosis. Check the exact instructions or ask the manufacturer before continuing.

      insufficient data

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

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