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Hiding a subwoofer inside a TV cabinet or media unit is tempting, but it usually makes bass worse and can shorten the sub’s life. Here’s why, when it’s marginally acceptable, and better ways to keep a sub out of sight.
Avoid it if you can. An enclosed cabinet rattles, traps heat, can block ports and often creates boomy, uneven bass. An open shelf with plenty of space is a compromise; the floor beside the unit is better.
What a cabinet does to your sub
- Resonance: cabinet panels and doors vibrate, adding buzzes and boom.
- Blocked ports and drivers: a ported sub needs space around the port; a front-firing driver needs open air in front.
- Heat: built-in amplifiers need ventilation, and many have heat sinks on the back.
- Placement: the spot is chosen for looks, not sound. See placement.
When it’s marginally acceptable
An open-backed or open-fronted shelf, with several inches of space around the sub, a front-firing sealed design, and the doors left off, can work acceptably. Put a dense pad under the sub and check for rattles with a bass sweep.
Better ways to hide a sub
- Choose a compact sealed sub like the KEF Kube 8 MIE that sits neatly beside furniture (see our Kube 8 MIE review).
- Use a sub designed to lie flat under a sofa, like the Sonos Sub 4 (with a Sonos system).
- Choose a finish that matches your room; some subs come in wood or white.
- Put a plant or side table nearby (not on top) to draw the eye.
- Use a wireless kit so the sub can sit in a less visible but acoustically good spot.
If you absolutely must use a cabinet
- Remove the doors or back panel.
- Leave at least 3–4 inches around the sub and in front of any port.
- Isolate the sub from the shelf with a dense pad.
- Run a bass sweep and fix rattles.
- Check the sub isn’t getting hot after a long movie.