Sonos Subwoofer Placement

Start near the speaker, then trust your seat

We'd start near the paired soundbar or speakers because it's a practical first spot, then make the final choice from the sofa. The best floor spot is the one that sounds balanced where you actually listen and still has a reachable plug and a safe route for its cord.

Its opening must stay clear, but the cabinet does not need to face you.

The shape tells you how it can sit

The cylindrical Sub has a tunnel through its center. The larger full-size Sub has a rounded-square body with an acoustic slot.

Older full-size Subs also stand upright or lie flat. Sonos's full-size Sub instructions (opens in a new tab) call for one side of the slot to stay open and at least 1 inch above a flat unit under furniture.

A corner, the sofa, or a space underneath

1. Before connecting power at any of these trial spots, route the cord clear of walking paths and furniture and confirm that the floor spot and Sub are dry. Set the Sub on a stable floor in the corner, reconnect power, and confirm playback through the Sub in its paired room before listening from your main seat. Keep that candidate only if several bass notes remain clear, rather than one note dominating.
2. Unplug the Sub before moving it behind the sofa. After repeating the cord and dryness checks, reconnect power, confirm playback through the Sub in its paired room, and listen from every seat used often. A spot that works for one listener but leaves another with weak bass stays a comparison spot, not the final choice.

3. For a full-size Sub under furniture, leave at least one side of its slot unobstructed and measure at least 1 inch of empty space above it. If the space fails either test, try beside the furniture instead.

A full-size Sub can be awkward to move. Use its acoustic slot as a handle, bend your knees, and get help if the lift feels too heavy.

If a full-size Sub will lie flat on a hard floor, optional felt feet protect the floor. They attach permanently, so use the feet and placement guide made for the unit. On a rug or with the Sub upright, the feet are unnecessary. If the matching feet or guide are missing, use a rug or keep the Sub upright.

1. Unplug the Sub. Lay the Sub down with its logo facing down. Place the supplied guide over one corner of the side without the logo and fold the guide's flaps over the edges.
2. Peel the backing from one felt foot and press its adhesive side into the guide's circle. Repeat at the other three corners.
3. Set the Sub on its feet and confirm that the cabinet no longer touches the bare floor.

Make the plug and cord part of the spot

For Sub 4 and Sub Gen 3, the supplied power cord is 6 feet long, so measure its route around furniture before sliding the Sub into place. You should be able to reach the plug without moving a heavy sofa or cabinet.

1. Place the unplugged Sub where you want to test it. Confirm that the supplied cord reaches the outlet without strain and that the cabinet stands securely.

2. Route the cord to the outlet without crossing a walking path or passing beneath a sofa leg. Look along its length after moving the furniture to confirm that nothing pinches it.
3. Keep the Sub away from water, drips, and splashes before reconnecting it. If it is wet, leave it unplugged; moisture can cause fire or electric shock, so have it evaluated before power is restored. Reconnect power and wait for the status light to stop flashing if it is enabled. Confirm that the paired room plays through the Sub before the listening test; a solid white light is another normal-operation cue when the light is on.

Compare spots without changing the test

Holding the passage and volume steady lets you hear what the move changed.

1. Play the passage with the Sub in the first spot. From your usual seat, listen to several bass notes and notice whether they have similar weight and remain clear.
2. Move the Sub to the next permitted spot. Once its light settles and it responds in the paired room, replay the same passage at the same volume.
3. Listen from any other seat used often. A spot behind the sofa may give the main seat strong bass while leaving another seat weak.
4. If a candidate is boomy, move it a short distance farther from the wall. If it is weak or uneven, shift it along the wall, then try another wall if needed. Replay the unchanged passage after each move.
5. Keep the practical spot that gives the best balance across the seats that matter. Choose clear, even bass over the loudest single thump.

If two or three practical spots still sound uneven, use a subwoofer crawl to find another candidate. The subwoofer placement tips cover further room comparisons.

1. Temporarily place the Sub at or near your main listening seat. Get help lifting a heavy full-size unit.
2. Loop the same familiar passage with a repeating bass line. Listen at low height around floor spots where the Sub could fit, and mark the places where several notes sound smooth and even.
3. Move the Sub to a marked spot, return to your usual seat, and replay the passage at the same volume. Repeat with the other promising spots.
4. Keep the practical spot that sounds most balanced from the seat. If none improves the sound, try a small move along another wall and compare again.

Set the sound after the location is settled

First, wait for the moved Sub to reconnect and replay your comparison passage. In the Sonos app, open Settings and select the room containing the paired soundbar or speakers. A paired Sub is controlled through that room; it is not a separate playback room.

If your paired room and phone support Trueplay, open the room's Sound settings, select Trueplay Tuning, and follow the prompts in a quiet room. Advanced tuning on a supported iPhone takes about 3 minutes. Keep the speaker volume unchanged while tuning, then replay the same passage at the same volume to hear the result.

Next, open Sound, then Sub Audio in the paired room. Make sure the Sub control is on and move Sub Level a small amount. Listen from your seat, comparing before and after with the same passage and volume. Sub Level changes the Sub's output against its paired speakers; the room's separate Bass EQ changes lower-frequency sound in the paired product.

You have the level right when the Sub adds weight without calling attention to one note. If raising it makes one note louder while the others stay weak, return to the placement comparison.

If bass remains weak at your usual seat, turn off Trueplay, then compare Phase Control at 0° and 180° using the same passage and volume, and keep the setting that sounds fuller and better blended. Trueplay sets phase itself and locks manual Phase Control while enabled. Sonos's Sub audio instructions (opens in a new tab) show the control.

If the bass disappears after a move

Seat the supplied cord firmly at the Sub and a working outlet, then let the startup light settle if it is enabled. Look in the app at the room the Sub was paired with; playback through the Sub and a responding Sub Audio control confirm the connection even when its status light is disabled.

1. If the Sub has power but still does not respond, unplug it for 10 seconds, reconnect it, and allow one minute for startup. Open its paired room again. If Sub Audio returns and playback includes the Sub, continue the listening comparison.
2. If other Sonos products have also disappeared from the app, unplug the router for 10 seconds, reconnect it, and wait for the network to return. Reopen the paired room. Products returning together point to the network interruption.
3. If only the new Sub location fails, try its previous working spot. When it reconnects there, move the new candidate at least 18 inches from other electronics and away from dense or metal obstructions, then test playback again. Keep the old spot or another location that stays connected.

If the Sub still fails in its previous working spot after the power, app, and reboot checks, the owner placement job is over. Contact Sonos Support for diagnosis and a US warranty or out-of-warranty service quote. Tell them the Sub family, exact light pattern, whether the paired room and Sub Audio appear, whether the old spot works, and the power and network steps you tried. Have your purchase date and proof of purchase ready.

The usual US limited warranty lasts one year from the original purchase date and may provide a covered repair or exchange. Outside coverage, get an itemized service or exchange quote. Before tax, a new Sub Mini runs $400 to $500 from sale to list price, a new Sub 4 lists at about $900, and a certified-refurbished older full-size Sub was listed at $640. Compare the quoted unit charge, shipping, and tax before deciding.

Questions that come up after placement