The short answer
Most wireless subwoofers pair by holding a small button on the back of the sub while the soundbar is in pairing mode, with both powered on and within a few metres. Power both off at the mains for a minute first, since a stuck state is the most common cause. Keep the sub away from the router and other 5GHz equipment, which is the band most of them use.
A soundbar and its subwoofer connect over their own wireless link, usually on 5GHz, and that link is paired at the factory. It survives normal use and does get lost after power cuts, firmware updates and moving the system to a different room.
The standard re-pairing procedure
Power both off at the mains
Not standby. Unplug the soundbar and the subwoofer for a full minute, which clears the link state.
Plug the subwoofer in first
Let it start and reach its idle state. Its indicator will usually be flashing or amber, meaning unpaired.
Plug the soundbar in
Give it thirty seconds to boot.
Press the pairing button on the subwoofer
A small recessed button on the back, often labelled ID SET, Pair or Link. Hold it until the indicator changes, typically five seconds.
Put the soundbar into pairing mode
The method varies: a button on the remote held down, a menu option, or a combination of buttons on the bar. The manual states it, and searching your model number with the word pairing usually finds it faster.
Wait for a solid indicator
A steady light on the subwoofer means paired. Test with content that has obvious bass.
Pair the pair in the same room, within two or three metres and with line of sight, even if the subwoofer will live elsewhere. Establishing the link is more demanding than maintaining it, and pairing across a room with furniture in between is a common reason the procedure appears to fail.
If it pairs then drops
- Distance and obstructions. Most wireless subwoofers are rated for a few metres in the same room. Behind a sofa, in a cabinet or on the other side of a wall is beyond what many manage reliably.
- Interference from your router. Many of these links use 5GHz. Moving the subwoofer away from the router, or changing the router’s 5GHz channel, often resolves repeated dropouts.
- Metal and mirrors between the two units, which attenuate the signal considerably.
- A power strip shared with a noisy appliance, which can cause the sub to reset.
- Firmware, which is worth updating on the soundbar since the wireless link is managed there.
If there is no bass but the link is fine
A connected subwoofer that produces nothing is a different problem:
- The subwoofer level is set to minimum in the soundbar’s settings, which some sound modes do automatically.
- Night mode or dynamic range compression is active, which deliberately reduces bass.
- The source is sending stereo only with no low-frequency channel, and the soundbar is not redirecting bass to the sub. Check the soundbar’s bass management or sound mode.
- The subwoofer is in a null position in the room, where the bass cancels. Moving it a metre changes this dramatically, and corners generally increase output.
- The content genuinely has little bass, which is worth ruling out with a known bass-heavy track before troubleshooting further.
Placement matters more than people expect
Bass behaves oddly in rooms. The same subwoofer can sound overwhelming in one position and inaudible two metres away, because low frequencies reinforce and cancel depending on the room’s dimensions.
The practical method is the subwoofer crawl: put the subwoofer where you normally sit, play something with steady bass, then crawl around the room at floor level listening for where the bass sounds best. Put the subwoofer there. It sounds absurd and it works.
Corners increase output and often make bass boomy rather than tight. Against a wall but away from a corner is usually a good compromise.
Do not put a subwoofer inside a closed cabinet. It needs the room to load into, and an enclosed space both muffles the output and causes the cabinet itself to resonate, which produces a rattle people mistake for a fault in the sub.
When the subwoofer has failed
Signs of an actual fault rather than a pairing problem include no indicator light at all, a burning smell, a loud hum with nothing playing, or a rattle that persists with the subwoofer disconnected from everything but the mains.
Amplifier failure in the subwoofer is the common one, since the amplifier for the sub usually lives inside it. On a system still under warranty this is a straightforward claim. Out of warranty, repair costs often approach the price of a replacement soundbar package, which is worth knowing before committing to a repair quote.
How do I re-pair my soundbar and subwoofer?
Power both off at the mains for a minute, start the subwoofer first, then use the pairing button on the sub and the pairing mode on the bar. The exact buttons vary by model, and the manual or a model-specific search states them.
Why does my subwoofer keep disconnecting?
Usually distance, obstructions or interference, since most use 5GHz and compete with your router. Move the sub closer, away from the router, and out of cabinets.
Can I use a different subwoofer with my soundbar?
Generally not. The wireless link is proprietary. Some soundbars have a subwoofer output socket, which does allow a third-party powered sub, and that is the exception rather than the rule.
Where should the subwoofer go?
Against a wall, on the same side of the room as the soundbar, not in a cabinet. Use the subwoofer crawl to find the best position, since room acoustics matter more than the specification.
Why is there no bass even though it is connected?
Check the subwoofer level in the soundbar settings, turn off night mode, and test with content that genuinely has bass. Position in the room also causes dramatic differences.
The short version
Unplug both at the mains for a minute, start the subwoofer first, and follow the pairing sequence in the same room within a couple of metres. If it drops afterwards, move it away from the router and out of cabinets. If it connects but produces nothing, check the subwoofer level and night mode before suspecting hardware, then experiment with position, because bass placement changes everything.
