Calculate speaker and subwoofer requirements based on your room dimensions.
Quick answer: For a typical 18 by 14 by 9 foot theater room (2,268 cubic feet) at moderate listening levels, one 12 inch subwoofer and speakers rated 87 dB sensitivity or higher are recommended, with a 5.1.4 Dolby Atmos layout. Enter your room dimensions below for a match.
Room Volume: 2,268 cubic feet
Medium-sized room - dual 12" subwoofers recommended
Medium-high sensitivity speakers (87+ dB) work well in this space. KEF Q Series, SVS Prime, and Polk Signature Elite are excellent matches.
For even bass distribution in a room this size, dual 12" subwoofers placed diagonally will smooth out room modes and provide authoritative bass.
5.1.2 or 7.1 configuration recommended for movies. Consider 7.1.4 Atmos if ceiling height allows.
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Multiple subwoofers help even out bass response across the room by canceling room modes (standing waves). Two subs placed in opposite positions typically provide 6-10dB smoother response than a single sub, meaning more consistent bass at every seat.
Higher sensitivity speakers (90+ dB) are easier to drive and better for larger rooms or longer listening distances. Lower sensitivity speakers (84-87 dB) can sound great but need more amplifier power to reach the same volume levels.
Ported subs dig deeper and play louder but are larger. Sealed subs are more compact with tighter, faster bass - often preferred for music. For home theater with lots of LFE effects, ported subs typically deliver more impact.
Master your speaker setup with our comprehensive guides
Sizing a specific room? There are worked examples for a 12x10x9 foot room at 1,080 cubic feet, a 14x12x9 foot room at 1,512 cubic feet and an 18x18x10 foot room at 3,240 cubic feet, each with its subwoofer size, speaker sensitivity and Atmos layout worked through.
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Compact satellites sized right for small to medium rooms, sold as a pair. Wall-mountable design keeps floor space clear; add a matching SVS subwoofer to complete a 5.1 layout.
9.4-channel receiver with Audyssey room correction that automatically adjusts speaker levels, distances, and EQ for your room. Powers systems from 5.1 to 7.1.4.
If speaker sizing calculations reveal your room is too small for a full system, the Sonos Arc Ultra delivers Dolby Atmos from a single bar with 14 drivers.