Studio Acoustics 8 min read Updated: October 2026

Studio Monitor Placement & Speaker-Boundary Interference Response (SBIR)

Even the most expensive mastering-grade studio monitors will produce wildly inaccurate frequency response if placed incorrectly relative to room walls. The primary culprit is Speaker-Boundary Interference Response (SBIR).

The Physics of SBIR

Low frequencies radiate omnidirectionally from a studio monitor cabinet. Sound traveling backward reflects off the front wall behind the speaker and recombines with the forward-firing direct sound. When the round-trip distance creates a half-wavelength time delay ($180^\circ$ phase shift), the reflected wave cancels the direct sound, creating a deep, un-EQable notch in your listening position.

$$f_{\text{cancel}} = \frac{c}{4 \times d_{\text{wall}}}$$

Quarter-wavelength cancellation notch frequency based on distance to wall ($d_{\text{wall}}$)

Practical Positioning Guidelines

To mitigate SBIR, either place monitors directly against the front wall (with rear-wall acoustic absorption) to push the cancellation notch up into the easily-absorbable midrange (> 250 Hz), or pull monitors out beyond 1.5–2.0 meters.

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