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NAD C 389 / NAD C 399: check a shifted balance when one channel is quiet

check a shifted balance when one channel is quiet. Exact C 389 or C 399, both channels were previously working, the source is a known stereo track, and current balance is visibly shifted. This does not cover a protection warning or damaged speaker.

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

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When this guide applies

Exact C 389 or C 399, both channels were previously working, the source is a known stereo track, and current balance is visibly shifted. This does not cover a protection warning or damaged speaker.

Connection scope: Device controls / power only. Symptom: Playback is too quiet or uneven.

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 C 389 or C 399, both channels were previously working, the source is a known stereo track, and current balance is visibly shifted. This does not cover a protection warning or damaged speaker.

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

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a1

Read Balance without compensating volume

Open Settings > Balance. Record the existing position and keep the listening level low.

Look for: A non-centred setting is confirmed.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a2

Return the owner’s unintended offset to centre

Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits.

Look for: Balance is at its centre setting.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a3

Compare the same stereo passage

Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.

Look for: Observe whether the left/right level relationship improves.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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

Is balance centred, and is the previously quiet channel now consistent on the same known stereo passage?

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

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals p.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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.14, Balance — Open Settings > Balance. Record the existing position and keep the listening level low. Use the menu controls to choose the centre balance position, which the manual defines as equal left/right levels. Do not increase channel gain or defeat volume limits. Keep the same source and seat. If imbalance persists, record it as a separate source/speaker question; a centred setting is not proof of hardware health.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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