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Interactive user guide

Crescendo 3D Setup Guide

TV headphone setup

Connect by Optical, HDMI ARC, or AUX, then listen through the Crescendo 3D headphones. You can also pair the headphones directly with a Bluetooth TV.

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.

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 headphones with PC / Phone

  1. Move the headphone switch to Bluetooth.
  2. Check that the LED flashes red + blue. If it does not, hold ⏯ for 3 seconds.
  3. On your PC or phone, turn on Bluetooth and select Crescendo 3D.
✓
Connected: the LED turns solid blue.
Watch: pair with a PC or phone

Add More Headphones

The Crescendo transmitter supports unlimited receivers. Add more headphones for family or group listening.

  • Eon Me — personalize sound with a Hearing Profile.
  • Eon 3D — enjoy immersive 3D surround sound.

Open the Add More Headphones Guide →

Reference

Connections and lights.

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