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Theory Audio Design sub15 15” High Output Passive In-Room Subwoofer
The sub15 passive in-room subwoofer employs a high-power, 1000W, 3” voice-coil, long-throw 15” driver. With a maximum output of 124dB the bass the sub15 provides belies intuition, extending deeper than seems possible, with tight, tuneful expression. It’s the perfect in-room subwoofer complement to Theory Professional full range speakers to create a truly astonishing high-energy environment.
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Professional Reviews 91/100
Deliciously Crispy
Bass
94/100
Integration
91/100
Dynamics
94/100
Build Quality
88/100
Features Usability
83/100
Value for Money
87/100
With its 15-inch driver and prodigious output, the Theory Audio Design sub15 delivers deep, physical bass with striking speed and control. Vince Hanada found it fills the room evenly while keeping ported-bass overhang exceptionally restrained, and ecoustics heard texture and articulation rather than generic boom.
What Reviewers Are Saying
Pros
Delivers exceptionally deep, visceral low-frequency impact with strong output and 20Hz-class extension.
Ported design remains unusually tight and controlled, with texture, articulation, and speed instead of loose boom.
Dual-sub installations produced notably even bass coverage and tactile impact across the listening room.
&
Cons
Its large, 76-pound enclosure demands substantial floor space and careful placement.
As a passive subwoofer, it requires compatible amplification, speaker cabling, and Theory DSP/controller configuration rather than simple line-level connection.
Assessments of Build Quality, Usability, and Overall Propositions.
Bass
94/100
Reviewers consistently found the sub15’s low end exceptionally deep, physical, and controlled. Ecoustics praised bass with texture, articulation, and speed rather than boom, while SoundStage Solo reported deep, guttural explosions, 20Hz capability, and ported-bass control tight enough to resemble a sealed design.
Integration
91/100
In the reviewed multi-sub installations, bass was described as evenly distributed throughout the room, with audible and tactile impact across seating positions. SoundStage Solo specifically noted minimized overhang and unusually tight behavior, helping the subwoofers avoid the bloated or detached character often associated with high-output ported designs.
Dynamics
94/100
Both reviews emphasize striking scale, impact, and clean high-level playback from the Theory systems using the sub15. Ecoustics compared the system’s scale and dynamics to the best movie theaters, while SoundStage Solo called the dynamic range incredible and found it remained clean even at unexpectedly high volumes.
Build Quality
88/100
Ecoustics found the Theory loudspeakers notably heavy and built to a substantially higher standard, highlighting the absence of cheap plastic and construction expected to last. SoundStage Solo likewise noted substantial materials and construction across the reviewed system, though long-term ownership evidence for the sub15 itself is limited.
Features Usability
83/100
The Theory controller platform automates speaker-model configuration, levels, delays, bass management, and signal routing through DSP. SoundStage Solo found the PC-based Automator setup effective but noted that post-setup adjustment is limited, with bass level being the main available user control.
Value for Money
87/100
At $2,900 per subwoofer, the sub15 sits in a serious high-output home-theater segment, and the reviews frame the larger Theory packages as competitive against similarly priced conventional systems. Ecoustics called the reviewed Theory surround system unmatched below $20,000, while SoundStage Solo initially questioned its $12,300 package price but concluded its output, component count, and performance made the outlay compelling.
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Authorized dealers for Theory Audio Design sub15 15” High Output Passive In-Room Subwoofer
- Audio Advice — online and in-store — Raleigh, North Carolina, United States (website)
- Audio Video Excellence — in-store — Scottsdale, Arizona, United States (website)
- AVIQ Huntsville — in-store — Huntsville, Alabama, United States (website)
- Brian's Custom Theaters & Hi-Fi — in-store — Nashville, Tennessee, United States (website)
- Gramophone - USA — online and in-store — Timonium, Maryland, United States (website)
- Hanson Audio Video — in-store — Dayton, Ohio, United States (website)
- Reference Media — in-store — Bellingham, Washington, United States (website)
- Sky by Gramaphone — online — United States (website)
- Tivoli Hi-Fi — online and in-store — Hawthorn East, Victoria, Australia (website)
- World Wide Stereo — online and in-store — Houston, Texas, United States (website)
and 1 more verified dealer