Audio Fix / setup help

NAD C 389 / NAD C 399: explain a missing chassis Bluetooth Mode with MDC2 installed

explain a missing chassis Bluetooth Mode with MDC2 installed. Exact C 389 or C 399 and the optional MDC2 BluOS-D module is positively identified from the external configuration or purchase record. Do not remove the cover to identify a module.

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

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When this guide applies

Exact C 389 or C 399 and the optional MDC2 BluOS-D module is positively identified from the external configuration or purchase record. Do not remove the cover to identify a module.

Connection scope: Bluetooth. Symptom: An option or codec is missing.

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 and the optional MDC2 BluOS-D module is positively identified from the external configuration or purchase record. Do not remove the cover to identify a module.

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

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a1

Confirm the installed option

Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed.

Look for: MDC2 BluOS-D presence is known.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a2

Read the documented role change

Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name.

Look for: The missing chassis menu is consistent with the documented configuration.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.Exact models: NAD C 399. Follow only the cited role and variant; successor models are excluded. · Source checked 2026-11-10

a3

Use the option’s own controls

For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.

Look for: The chassis route and module route remain distinct.

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 MDC2 installed and is the absent chassis Bluetooth Mode explained by that documented condition?

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

  • Manufacturer-documented NAD C 389 — manufacturer instructions ↗Owner manuals pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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 pp.10,16, MDC2 and Bluetooth Mode — Use the product configuration or visible external module identity. If module presence is uncertain, stop; this procedure is conditional on it being installed. Both manuals say the chassis Bluetooth Mode menu is unavailable with MDC2 BluOS-D installed. The chassis Bluetooth source becomes non-functional; this is not repaired by repeatedly pairing to its old name. For Bluetooth incorporated in MDC2 BluOS-D, consult the BluOS app/module instructions. Do not apply the no-module Sink/Source menu sequence or attempt to uninstall a module.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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