When the Bass Module 700 makes no sound, first read its rear LED: solid white means it is connected and playing with the soundbar, solid dim amber means it lost the soundbar, and off means power-saving mode. Bose's will-not-turn-on article says to check the module is connected to a working outlet and try a different outlet or power cord, and its no-audio pages send you to the host soundbar for source, volume and connection checks.
Differential
Likely causes of “Bose Bass Module 700 connects but has no sound”, and how to tell them apart
- 1
No power to the module
What separates it The LED is off even after the soundbar wakes
How to confirm Plug the module into a working outlet and try a different power cord
- 2
The link to the soundbar is lost
What separates it The LED is solid dim amber and there is no bass
How to confirm Power-cycle the module and reconnect it to the soundbar
- 3
The soundbar is muted or silent
What separates it The soundbar itself plays nothing either, so the fault is not only in the module
How to confirm Test another source and raise the soundbar volume
- 4
A source without bass content
What separates it Bass is missing only for certain programs or music
How to confirm Compare with a known bass-heavy source such as a music track with a strong drum line
Before you touch a setting
Record this first — changing settings destroys the evidence
- The LED state on the lower rear
- Whether the soundbar plays sound normally
- Whether the outlet powers another device
Try in this order
0 of 5 completedCheck the outlet
ReversibleVerify the module is connected to a working outlet, and plug a lamp into the same outlet to prove it has power.
Read the LED
ReversibleOff means power-saving mode, dim amber means disconnected from the soundbar, and solid white means connected and ready to play with the soundbar.
Test another source
ReversiblePlay bass-heavy content from another input on the soundbar to see whether the soundbar drives the module.
Power-cycle
ReversibleDisconnect the module's power for 30 seconds, reconnect it and wait 15 seconds for it to reconnect to the soundbar.
Reset the host
ReversibleReset the soundbar with the module unplugged, restore the soundbar first, then reconnect the module after the soundbar has rebooted.
Model-specific
What is true of this model and not of its siblings
- Where the LED is
- The light sits on the lower rear of the module, so it is easy to miss when the module is against a wall or under furniture. Look at it with a flashlight when checking the connection.
- Why it is an accessory
- The Bass Module 700 adds low frequency output to a compatible soundbar system and cannot play on its own. Because it takes its signal wirelessly from the soundbar, setup, tone controls, audio artifact fixes and connection problems are all handled from the host soundbar's own help pages, which is where Bose sends you.
- LED and power saving
- When the soundbar is off for a while the module can sit in power-saving mode with its LED off, which is normal and not a fault. The LED returns when the soundbar wakes. If it stays off with the soundbar playing and a known-good outlet and cord, Bose says to start a repair or replacement.
Stop boundary
When this stops being a self-service repair
- !If the LED never lights in any outlet with a good cord, Bose says to start a repair or replacement
- !If the LED shows any unlisted state, the module requires service
Evidence ledger
Sources behind this answer
The rear LED states from off to white blinking.
Outlet, cord and LED checks.
Unplug 30 seconds and wait 15 seconds to reconnect.
The label on the bottom of the module.
The module works only with a host soundbar or console.
Refers to the host product's troubleshooting.
Refers to the host product's troubleshooting.
Refers to the host product's troubleshooting.
Tone is set on the host product.
The Connect step for an accessory bass module.
Disconnect the bass module and surround receivers during a reset.
The same accessory disconnect step for the Ultra.
Lists the Acoustimass 300 and Bass Module 700 LED states.
Exact questions
Common questions
What does an off LED mean?+
An off LED means power-saving mode, or no power reaching the module.
Should I try another outlet?+
Yes, Bose says try a different outlet and cord.
Does the module play alone?+
No, it needs a host soundbar.
What if the LED is white but silent?+
Check the soundbar's settings and source.
How long to wait after power-up?+
About 15 seconds for the module to reconnect to the soundbar.
Is the module mute-controlled?+
Its level follows the soundbar, so muting the soundbar mutes it too.
What is dim amber?+
Solid dim amber means the module is disconnected from the soundbar.
Where is help for low audio?+
Bose sends you to the host soundbar's pages for low-audio troubleshooting.