STS subwoofer


C20 Audiophile Top 25 of All Time AwardLS4 Excite Award WinnerS90i CE Pro Best Award Finalist

Free-Standing RTL Subwoofer

The STS establishes a new benchmark in subwoofer performance. Until now, there hasn’t been a subwoofer that is capable of delivering both unsurpassed musicality, and the high SPL and accurate, extended bass desired for the ultimate in movie performance within large residential spaces. The STS’ highly efficient dual 15-inch woofers yield fast, dynamic results with accurate timbre for unsurpassed musicality. Each STS can deliver significant SPL, given its 101dB sensitivity, reaching an astonishing SPL capability of 130dB at 20 Hz.

The Regenerative Transmission Line®

Regenerative Transmission Line® designs yielded the unique combination of high sensitivity, high output, and low distortion with the uniform and extended response we required. The result is extraordinary power and punch combined with a remarkable level of quickness, tunefulness, and realism.

Key Features

Behind Baffle
Behind Screen-Wall
Ported into Room
Regenerative Transmission Line® Design

Highly Detailed & Dynamically Accurate
(2) Custom Designed High-Output Long Throw 15” Woofers

Optional floor/ceiling extension port kit available for venting into space from an adjacent room, attic, riser, ceiling, and/or floor.
Multi-port design allows for flexibility in how the STS output is ported into the room.

Flat Frequency Response Across a 20Hz-80Hz±2dB Operating Range
(2) 15″ High Operating Woofers
DSP Required
(1) Channel of Power Amplification per Subwoofer Required


Frequency Response20Hz – 80 Hz ± 2dB relative to the target curve
Impedance4 ohms
Sensitivity101 dB / 2.83V / 1m
Power Handling, Peak5000w
Max SPL130dB / 20Hz / 1m
Net Weight251 lbs. (113.85 kg)
Shipping Weight405 lbs. (183.7 kg)
Dimensions – HxWxD59” x 36” x 17.75” (149.8 cm x 91.4cm x 45.1cm)


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STS Owner’s Manual

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STS Dimensions (PDF)

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STS Dimensions (DWG)

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