Room throw X Placement is oriented down the room's longer dimension.
Listener depth 50% Start near 38% from the front wall, then adjust by measurement.
Stereo angle - Aim for roughly 60° between left and right speakers.
Suggested spread 0.87 m Uses an equilateral triangle around the current room centerline.
SBIR variants speaker / listener Wall 0.13 m 38% listen, 686 Hz notch Mid 0.40 m 41% listen, 214 Hz notch Free 0.90 m 45% listen, 95 Hz notch
Wall keeps the listener near 38%. Mid and Free move the listener deeper to preserve a useful stereo triangle as the speakers come forward. First SBIR notch 86 Hz Nearest speaker boundary is 1.00 m; avoid equal distances to several boundaries.
RT60 estimate 0.47 s Sabine estimate using a broad average absorption assumption.
Critical distance 0.91 m Average speaker distance is 2.12 m; inside critical distance is more direct-sound dominated.
Absorption needed 13.6 m² To target RT60 0.30 s, assuming current average alpha 0.22 and panel alpha 0.85.
Stereo presets keep the listener centered, place speakers symmetrically, and avoid exact wall
midpoints. The SBIR variants provide practical starting points: Wall places speakers close to the
front boundary to push cancellation higher, Mid leaves stand or desk clearance, and Free is for
rooms where the speakers must live well off the wall. Surround and height presets use common angle families around the listener as starting points, not
final calibration positions. RT60, critical distance, and absorption need are broadband estimates
until surface absorption and speaker directivity are specified; they do not predict bass-trap or
modal-control performance directly.
