Free tool

Speaker Placement Planner

Enter your room dimensions and get a labeled starting-point layout for your monitors and listening position — an equilateral triangle check, a symmetry check, and a boundary interference (SBIR) reference frequency.

Room length (m) — front wall the speakers face across

Room width (m)

Room height (m)

Listening position from front wall

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~38% of room length — starting point, refine by ear.

Speaker distance from front wall

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Pulled off the wall to reduce SBIR.

Speaker distance from side wall

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Equal on both sides, for symmetry.

Equilateral triangle side

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Speaker-to-speaker ≈ speaker-to-listener.

Side-wall symmetry

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Can the layout fit symmetrically?

Approx. first boundary null

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SBIR reference frequency, not a precise prediction.

Every number here is a labeled starting-point heuristic, not a fixed rule — refine by ear and by measurement once your speakers are in the room.

Room layout (top-down)

Starts from the recommendation above — adjust the sliders to try a different layout and see the warnings update live.

Speaker from front wall

Speaker from side wall

Listener from front wall

First reflections & boundary interference

Assumes a tweeter/ear height of about 1.2 m (not entered above) — treat reflection points as the center of a treatment area, not a single pinpoint.

Side-wall reflections (top-down)

Boundary interference (SBIR), front wall

Want the editable spreadsheet version?

The Speaker Placement Planner product lets you adjust every assumption and includes the full guide behind the numbers.

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