Fantastic Theaters · Room Planning

Bolt Range

Checks a proposed room shell against M&K's suggested sizing: volume, surface area, Schroeder frequency, and how far it can flex before the speaker mounts fall outside Bolt Range.

Room Shell

Bolt Range category

Proposed room

Target RT60 0.21s

Reverberation time assumed for a well-treated critical-listening room. M&K's own reference sizes imply ~0.21s — adjust if this room's treatment plan targets something else.

Boundaries, not finished dimensions. All figures describe the room shell. Baffle and screen walls project inward from here — budget a minimum 24″ baffle/screen depth so screen channels clear the woven screen and deep subwoofer enclosures.
Good / Better / Best isn't set by room size alone. M&K weighs it by system max SPL, discrete decoder channel count, processor and projector capability, and video processing — the room shell is one input among several.
Readout Large category
In Bolt Range Every dimension is within 1′ of the Large baseline.
Volume
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—
Surface area
—
—
Schroeder freq.
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transition to diffuse field
Shell, to scale
Modal region
Modal-dominated Diffuse field
20 Hz110 Hz300 Hz

Below this frequency, room modes (not the loudspeakers) shape the bass response — the reason bass management and seat placement matter more than EQ down there.

Tolerance — each dimension can move ±1′ from the category baseline, independently, and stay in Bolt Range
BaselineProposedOff by
Length———
Width———
Height———