Free-Standing Regenerative Transmission Line® 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.


Key Features


Free-standing, Behind Baffle/Screen-wall, Ported into room

Regenerative Transmission Line® design

Key Benefits

Highly Detailed & Dynamically Accurate

(2) Custom designed high-output long-throw 15” woofers


Optional floor/ceiling extension port kit available for venting into a 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.

More Features

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

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.


Frequency response 20 – 80 Hz ± 2dB relative to the target curve
Impedance 4 ohms
Sensitivity 101 dB / 2.83V / 1m
Power handling, peak 5000w
Maximum SPL 130dB / 20Hz / 1m
Shipping weight 350 lbs. (159 kg)
Dimensions HxWxD 59” x 36” x 17.75” (149.8 cm x 91.4cm x 45.1cm)