Free tools for planning, building and tuning a subwoofer setup. They all run in your browser, work on phones, and don’t need an account or a download.
What size subwoofer do I need?
Answer a few quick questions about your room or car and how you listen, and get the right size, sealed or ported, plus three matching picks.
Subwoofer placement calculator
Enter your room and seat to get a heat map of the best sub positions, a list of your room modes, and the smoothest layouts for two or four subs.
Subwoofer test tones
Play any bass frequency from 10 to 200 Hz, run a slow sweep to find rattles, and chart your room’s bass response with a decibel meter or phone app.
Subwoofer box and port calculator
Work out net box volume, port length or tuning, port air speed, every way to wire your voice coils, and how loud your system can get.
Car amp wire and fuse calculator
Get the right power and ground wire gauge, the fuse size at the battery and an alternator check for one to three amps.
Which tool do you need?
- Shopping for a sub? The size quiz tells you which size and type to look for, for a room or a car.
- Not sure where to put your sub? The placement calculator shows the best spots for your room and seat.
- Thinking about a second sub? Compare layouts in the two subs tab.
- Bass sounds boomy, thin or uneven? Run the room check in the test tones tool, then read our placement guide.
- Something buzzes when the bass hits? Use the sweep to find the frequency, then see how to fix subwoofer rattles.
- Not sure your sub is working properly? Start with how to test a subwoofer and play a few tones.
- Building a box or adding a port? The box calculator gives you the real internal volume, and the port tab tells you how long to cut the port.
- Wiring a car amp? The amp wire calculator gives you the power wire gauge and fuse size.
- Wiring two or more car subs? The wiring tab shows every option and which loads your amp can handle.
More tools are on the way. If there’s one you’d like to see, tell us.