Manual for Soundbar with wired subwoofer

Brand: JVC

Category: Home Appliances

Document Type: Manual

Language: EN

Uploaded: Nov. 21, 2025, 7:26 p.m.

Warranty Information

None

General Operation

Standby / ON

When you first connect the unit to the mains socket, the unit will be in Standby mode.
Press the Power button (symbol) on the unit or on the remote control to switch the unit on.
Press the Power button (symbol) on the unit or on the remote control again to switch the unit back to Standby mode. The Power Indicator will light up red.

Automatic Power Off Function

The unit automatically turns to Standby mode after about 15 minutes if the TV or the external unit is disconnected, switched off or the volume is too close to mute.

Note: To switch the unit off completely, remove the mains plug from the mains socket. Please turn the unit off completely to save energy when not in use.

Selecting Modes

Press the SOURCE button on the unit or remote control repeatedly to select between AUX, BT, OPTICAL and COAXIAL mode.

Adjusting the Speaker Level Settings and Effects

Adjusting the Volume

Press VOL+/VOL– on the unit or remote control to adjust the volume.
If you wish to turn the sound off, press MUTE on the remote control. Press MUTE again, or press VOL+/VOL– on the unit or on the remote control to resume normal listening.

Select Equaliser (EQ) Effect

Press the EQ button on the unit or the CUSTOM/MOVIE/MUSIC button on the remote control to select the preset equaliser effects.
When CUSTOM (Default) is selected, the COAXIAL indicator will flash (Orange) once.
When MOVIE EQ is selected, the OPTICAL indicator will flash (White) once.
When MUSIC EQ is selected, the BT indicator will flash (Blue) once.

Note: While the unit is in COAXIAL, OPTICAL, or AUDIO IN mode, it will automatically switch into MOVIE EQ effect. While the unit is in Bluetooth mode, it will automatically switch into MUSIC EQ effect.

Troubleshooting and error codes

Problem	Solution
No power.	Ensure the mains plug is connected. Make sure that you select the On mode.
The remote control does not function.	Use the remote control near the unit. Point the remote control at the remote sensor on the unit. Replace the battery in the remote control with a new one. Remove any obstacles between the remote control and the unit.
Loud hum or noise is heard.	The plugs and sockets are dirty. Wipe them with a cloth slightly moistened with alcohol.
No sound from the soundbar and subwoofer.	Please try either one of the solutions below: Make sure that the unit is not muted. Press MUTE or VOL+/- button to resume normal listening. Press the Power button (symbol) on the unit or on the remote control to switch the soundbar to standby mode. Then press the button again to switch the soundbar on. Unplug the soundbar from the mains socket, then plug it in again. Switch on the soundbar. Ensure the audio setting of the input source (e.g. TV, game console, DVD player, etc.) is set to PCM mode while using digital (e.g. OPTICAL) connection. The unit may not be able to decode all digital audio formats from the input source. In this case, the unit will mute. This is NOT a defect.
The unit does not respond when pressing any buttons.	The unit may freeze up during use. Switch the unit off and then on again at the mains socket to reset the unit.
Intermittent sound output from subwoofer.	You are at the operating limit of the subwoofer. Reconnect the subwoofer to the soundbar.
I cannot find "TH-D337B" on my Bluetooth device	Ensure that the unit is switched on. Ensure that the Bluetooth® function is activated on your Bluetooth® device. The unit has a Bluetooth® function that can receive a signal within 6 metres. Keep a distance within 6 metres between the unit and your Bluetooth® device.