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Subwoofer and room acoustics guides
Updated
These guides explain why bass sounds different from one seat to the next and what you can change about it: where to put a subwoofer, how room modes and standing waves work, and how to troubleshoot a dip at a particular frequency. Start with the subwoofer setup guide if you are placing a sub for the first time, or with bass dead spots if one seat already sounds wrong.
Subwoofer setup
- Subwoofer setup guideHow to set up a subwoofer: where to place it, how walls and seats change the bass you hear, and how to set crossover, level and phase without guesswork.
- How to find the best subwoofer positionA practical subwoofer placement method: choose candidate spots, measure every seat, compare the results, and pick the position with the most even bass across seats.
- Subwoofer crawl explainedThe subwoofer crawl puts the sub at your seat while you listen around the room. How to do it, why it works, where it misleads, and how to check the result.
- How to read a subwoofer frequency responseHow to read a bass frequency response: peaks, nulls, smoothing, seat-to-seat variation, and what a single microphone position can and cannot tell you.
Room acoustics
- Room acoustics for better bassHow room acoustics shape bass: why small rooms have modes, peaks and nulls, what placement changes, what absorption changes, and how to measure the difference.
- Room modes explainedRoom modes explained with the formula and worked examples: axial, tangential and oblique modes, how room size sets them, and why each seat hears them differently.
- Standing waves in room acousticsHow standing waves form between room surfaces, where the pressure peaks and nulls of each mode sit, and what that means for subwoofer and seat placement.
Troubleshooting bass problems
- Why bass disappears in some spotsWhy bass vanishes in one seat and booms in the next: room modes, boundary cancellation, why EQ boost rarely fills a null, and the changes that actually move it.
- Troubleshoot a 40 Hz bass nullTroubleshoot a dip near 40 Hz: check whether it moves with the seat or the subwoofer, compare it with your room's length, and test placement before EQ.
- Troubleshoot a 60 Hz bass nullA dip near 60 Hz often comes from a nearby wall reflection or a mode across the room's width or height. How to tell which, and what to change first.
Tools
How these guides are written
The physics here is standard room acoustics, with formulas stated alongside their assumptions. Where a page gives numbers, they come from those formulas, not from BassMap measurements, and every page says what a prediction or a single measurement cannot tell you. BassMap is mentioned where measuring the whole listening area, rather than one spot, changes what you can learn.