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Crescendo 3D · 7100D

Immersive TV sound, without disturbing the room.

Connect the powered transmitter to your TV, set the TV to PCM, then listen through the automatically connected headphones.

Start SetupFix a problem
Crescendo 3D headphones with transmitter and charging dock

Start setup

How do you want to connect?

Choose the option that works best for you.

★ We recommend the Crescendo 3D kit for the best experience.

Fix a problem

Match what you see.

Each fix includes the expected result and a recovery path.

Transmitter has no lights
  1. Use the included USB-C cable and 5 V / 1 A adapter.
  2. Plug the adapter into a wall outlet and slide the transmitter to ON.
  3. Reseat both cable ends; then try another known-working outlet.

Expected: transmitter indicators light. If still dark, submit a ticket and include a photo of the power connection.

Headphones say connected, but no TV sound
  1. Start active TV playback.
  2. Match SELECT INPUT to the connected cable.
  3. Choose that audio output on the TV.
  4. Set digital audio to PCM; disable eARC for HDMI ARC.
  5. For AUX, raise the TV headphone volume.

Expected: transmitter audio-valid light is solid white and TV audio plays. Open full no-sound guide →

Optical port is already used by a soundbar
  1. TV Optical Out → transmitter OPT 1.
  2. Transmitter OPT 2 → soundbar Optical In.
  3. Set SELECT INPUT to OPT/AUX and the TV format to PCM.

Expected: both headphones and soundbar play stereo audio.

TV has HDMI, but not HDMI ARC

A regular HDMI input cannot send TV audio to the transmitter. Use Optical or AUX. HDMI ARC passthrough works only with ARC; eARC is not supported.

Expected: sound after switching to a supported TV output and matching transmitter input.

Soundbar and headphones do not play together
  1. Use matching passthrough ports: OPT 1 → OPT 2, or HDMI ARC 1 → HDMI ARC 2.
  2. Set the TV to PCM stereo.
  3. Select the matching input on the soundbar.

Expected: both play; Dolby/DTS is unavailable during simultaneous use. HDMI ARC bypass guide →

Headphones will not connect to the base
  1. Confirm the transmitter is powered on.
  2. Move the headphone switch to Base, not Bluetooth.
  3. Keep the headphones close to the base and power-cycle both devices.

Expected: headphone LED changes to solid blue.

Daily use

Sound, charging, and expansion.

Choose a listening mode

Press EQ: Balanced → Clear Voice → Cinema Sound.

Charge the headphones

Use the powered dock or USB-C. Solid red means charging; the light turns off when full (about 2.5 hours).

Watch: charge the headphones

Use Bluetooth

Switch to Bluetooth. Select Crescendo 3D. Solid blue means connected.

Reference

Connections, lights, and official help.

Quick reference

TV inputs
HDMI ARC, Optical, AUX
Power
5 V / 1 A via USB-C
Solid blue
Headphones connected
Red + blue
Bluetooth pairing
Solid red
Charging
Battery
Up to 60 h; about 2.5 h charge

STILL NEED HELP?

Get the right help for Crescendo 3D.

Choose Crescendo 3D / 7100D and include the TV model, cable type, selector position, LED states, and clear photos of the TV and transmitter ports.

RECOMMENDEDSubmit a Crescendo 3D support ticketAdd photos or screenshots so the team can see the exact wiring and TV settings.Start support request →

DON'T WANT TO SUBMIT A TICKET?

Talk to a real support agent.

Email: support@avantree.comUS phone: 800 232 2078

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