A subwoofer is the single most transformative thing you can add to a home theatre or a stereo. It is the difference between hearing an explosion and feeling it, and on music it does the quiet work of giving double bass, kick drums and organ notes their proper weight and body. If you are shopping for your first one, the choice can feel like a wall of numbers. It comes down to three decisions, and this guide walks through each one.
Sealed or ported: the first fork in the road
Nearly every subwoofer falls into one of two camps, and the difference is genuinely audible rather than marketing.
A sealed subwoofer is exactly that: the driver sits in a closed box. Sealed subs are prized for tight, accurate, fast bass with excellent detail, and they roll off gently in the deep bass in a way that tends to work with a room rather than against it. This is the sound we reach for. And it is not only a small-room or music choice: a large sealed subwoofer with plenty of amplification behind it will play deep and loud while keeping that control, which in our view makes it the reference choice for movies and music alike. The trade-off is cost, because deep, high-output sealed bass needs a big driver and serious power. Have a look at the sealed subwoofers range.
A ported subwoofer adds a tuned opening (the port) that lets the same driver and amplifier play deeper and louder. That makes ported the value champion: it gives you the most output and low-end extension for your dollar, which is exactly why so many people start here. The trade-offs are a bigger box, and bass that, while genuinely impressive, is not quite as tight and controlled as a well-sorted sealed design. See the ported subwoofers range.
So the honest take, and it is our opinion after a lot of years of doing this: ported gives you the most bang for your buck, and there is nothing wrong with that at all. But if you are chasing the best quality bass, a large sealed subwoofer with generous amplification is what we would put in the room, and it handles films every bit as well as music. Sealed for ultimate quality, ported for maximum output per dollar.
Getting the size right
Bigger is not automatically better. A subwoofer that overwhelms a small room is just as wrong as one that runs out of puff in a large one. Two factors set the sensible size.
Your room's volume. A small study or apartment lounge is well served by a compact sealed sub. A large open-plan living area, or a dedicated theatre with volume to fill, needs more driver area and more amplifier power to pressurise the space. As a very rough guide, the bigger and more open the room, the bigger the sub, or the more subs, it will take to do the job cleanly.
How you use it. Reference-level movie nights ask far more of a subwoofer than background music does. If you like it loud, give yourself headroom. A sub cruising at half its ability sounds cleaner and lasts longer than a small one being pushed to its limit on every scene.
If in doubt, err slightly larger and turn it down. A capable sub run gently always sounds better than a small one straining.
The upgrade almost no one expects: more than one subwoofer
Here is the tip that surprises most first-time buyers. If your budget stretches to it, two subwoofers will almost always beat one, not because they play louder, but because they play more evenly.
A single subwoofer excites the room's modes from one location, so the bass is strong on some seats and weak on others. Two subs placed well average those peaks and dips out across the whole room, so everyone on the couch gets the same solid, even bass. Two is a great start, and it is worth planning for even if you buy one now and add the second later.
In a dedicated or high-end room, this goes further, and it is worth being clear about: four subwoofers, spread around the room, is the target. Every sub you add smooths the response more thoroughly, and four is what evens the bass across every seat to a standard you can genuinely rely on. You do not have to start there, but if you are building a serious room, plan the layout with four in mind rather than retrofitting later.
Placement: free performance most people leave on the table
Where you put a subwoofer changes how it sounds as much as which one you buy. The same sub can be boomy in a corner and lean in the open, so this step is worth getting right before you touch a single setting.
- Corners give you maximum output. Tucking a sub into a corner uses the room's boundaries to reinforce the bass, which is handy if you want the most level for the least money. The catch is that corners also tend to excite room modes most strongly, so the bass can be powerful but uneven.
- Along a wall, off-centre, is often the sweet spot for smoother response.
- The "subwoofer crawl" is a genuinely useful trick. Put the sub in your main listening seat, play something with steady bass, and crawl around the room on your hands and knees. Wherever the bass sounds best to your ear is a good spot to place the sub. It sounds silly and it works.
To take the guesswork out entirely, our Room Mode Calculator predicts where your room's problem frequencies fall from its dimensions, so you can place the sub and seats intelligently from the start. And if you want to verify the result, a measurement mic will show you exactly what you have achieved.
Setting it up once it is in
A few settings turn a well-chosen, well-placed sub into a properly integrated one: set the crossover so the sub takes over where your main speakers naturally roll off, match the level so the bass supports the sound rather than dominating it, and get the phase right so the sub and speakers pull together instead of fighting. Your AV receiver's room-correction system will handle much of this automatically, and it is a great starting point.
The short version
For the best quality bass, choose a sealed subwoofer with plenty of amplification; choose ported when you want the most output for your dollar. Size to your room and how loud you like it, and lean larger rather than smaller. If you can, run more than one: two is a great start, and four is the goal in a dedicated room. Then spend real care on placement, because it is the free half of the performance.
If you would like a hand matching a subwoofer to your exact room and speakers, that is what we are here for. Browse the full subwoofers range, or book a consult and we will point you at the right one, no upselling, just the sub that suits your room.
