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Marantz MODEL M1: compare direct TV listening without HEOS follower rooms

Marantz MODEL M1 — compare direct TV listening without HEOS follower rooms. 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 Marantz MODEL M1. MODEL M1 is the positively identified original group source directly connected to the TV/set-top source. Only normal external user controls; no mains modification, chassis opening, reset or firmware installation.

Connection scope: Wi-Fi / Ethernet network audio. Symptom: Sound and picture are out of sync.

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

The external TV source is directly connected to this MODEL M1 as original group source, each follower is identified and every affected listener accepts stopping grouped playback in those rooms. Exactly one identified follower is currently grouped with the original source MODEL M1.

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented Marantz MODEL M1 official Owner’s Manual ↗PDF pages 20,34: Ungrouping / delay on external TV input — External TV input distributed to multiple HEOS products is buffered and can be delayed against the picture. Listen only on the directly connected unit to avoid that group-distribution delay. To ungroup, hold a follower room and drag it out; the original source room cannot be removed this way.Exact MODEL M1, not another Marantz amplifier’s remote or Bluetooth transmitter. · Source checked 2026-11-09

a1

Open the actual TV group in HEOS Rooms

Identify the source room and each follower; do not try to drag out the original source room.

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

  • Manufacturer-documented Marantz MODEL M1 official Owner’s Manual ↗PDF pages 20,34: Ungrouping / delay on external TV input — External TV input distributed to multiple HEOS products is buffered and can be delayed against the picture. Listen only on the directly connected unit to avoid that group-distribution delay. To ungroup, hold a follower room and drag it out; the original source room cannot be removed this way.Exact MODEL M1, not another Marantz amplifier’s remote or Bluetooth transmitter. · Source checked 2026-11-09

a2

Drag the one identified follower room out of the group

Remove only that accepted follower, leaving the directly connected original source MODEL M1 alone.

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

  • Manufacturer-documented Marantz MODEL M1 official Owner’s Manual ↗PDF pages 20,34: Ungrouping / delay on external TV input — External TV input distributed to multiple HEOS products is buffered and can be delayed against the picture. Listen only on the directly connected unit to avoid that group-distribution delay. To ungroup, hold a follower room and drag it out; the original source room cannot be removed this way.Exact MODEL M1, not another Marantz amplifier’s remote or Bluetooth transmitter. · Source checked 2026-11-09

a3

Compare the same TV speech directly on MODEL M1

Keep volume comfortable; this does not promise correction of unrelated TV/source processing delay.

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

  • Manufacturer-documented Marantz MODEL M1 official Owner’s Manual ↗PDF pages 20,34: Ungrouping / delay on external TV input — External TV input distributed to multiple HEOS products is buffered and can be delayed against the picture. Listen only on the directly connected unit to avoid that group-distribution delay. To ungroup, hold a follower room and drag it out; the original source room cannot be removed this way.Exact MODEL M1, not another Marantz amplifier’s remote or Bluetooth transmitter. · Source checked 2026-11-09

result

Check the actual result

Is the direct-only TV comparison acceptably synchronized?

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented Marantz MODEL M1 official Owner’s Manual ↗PDF pages 20,34: Ungrouping / delay on external TV input — External TV input distributed to multiple HEOS products is buffered and can be delayed against the picture. Listen only on the directly connected unit to avoid that group-distribution delay. To ungroup, hold a follower room and drag it out; the original source room cannot be removed this way.Exact MODEL M1, not another Marantz amplifier’s remote or Bluetooth transmitter. · 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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