Practical tools for measured work
Stereo Speaker Placement Calculator
Lay out a centred stereo triangle from room dimensions, speaker offset and listening position.
The 38% field is measured forward from the rear wall. The speaker pair is centred and capped at 80% of room width to leave side-wall clearance.
How it works
How to use it: enter the room and front speaker offset. Adjust the listening position from the rear wall; 38% is a starting point, not a rule.
Method. The calculator targets a 60-degree stereo angle, then limits separation where the room is too narrow.
Example. With a 4.2 by 5.5 m room and a seat 38% from the rear, the listener is 3.41 m from the front wall.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Room width
- 4.2 m
- Room length
- 5.5 m
- Listener from rear wall
- 38 %
- Speakers from front wall
- 0.5 m
Primary result: Speaker separation: 3.36 m.
Before using the result
- Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
- Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
- When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.
Limitations
This is geometric placement, not acoustic optimisation. Furniture, doors, speaker directivity, boundary gain and measured bass response may justify asymmetric or non-equilateral positions.
Frequently asked questions
Must the speakers form an exact equilateral triangle?
No. A 60-degree included angle is a useful stereo baseline, then toe-in and spacing should be verified by listening and measurement.
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