Steinway & Sons



The LS series is the number one choice for larger rooms and spaces with rows of elevated seats. The series features an innovative line source approach incorporating floor-to-ceiling stackable speakers and boundary woofers. This allows sound to propagate over long distances, thus ensuring tonal consistency by reducing reflections from ceiling and floor, especially in large rooms. Line source technology means that every seat in the listening space has almost the same volume level and offers the same sound experience, from the front to the rear of the room.

Stackable boundary woofers

The stackable LSR-212 boundary woofer, with its powerful 117 dB SPL, provides powerful and accurate bass to create a fully encompassing experience – direct sound and reflections from the environment arrive at the listening point at exactly the same time. Stacking options are fully customizable; you can stick with one pair for a smaller room, or begin to stack woofers to achieve the same sound pressure in a larger room.

Lifestyle picture of Model S in a livingroom
Lifestyle picture of Model S close up


Description: In-room stackable boundary woofer
Frequency response: 20 – 500 Hz
Max SPL @ 1m: 117 dB (120 dB Corner)
Amplification needed: 1 channel
Dimensions (H x W x D): 71.0 x 45.0 x 27.0 cm / 28.0 x 17.7 x 10.6 in
Weight: 35.4 kg / 78.3 lbs
Finish: Matte black, high-gloss black, high-gloss white.

Fact sheet
Installation manual
Technical drawings


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This product is listed in D-Tools.

Integrated system approach

All Steinway & Sons products can be combined for individual Steinway & Sons sound systems and follow our integrated system approach. The chosen loudspeakers are programmed into the processor, and amplifiers are connected reliably using our own digital signal connection. RoomPerfect™ will further acoustically calibrate the loudspeakers to the room. With this integrated system approach, we can guarantee the legacy of absolute perfection that comes with the Steinway & Sons partnership. A perfection which can never be attained mixing products “off the shelf” from different manufacturers.

This boundary woofer can be combined with the following models, depending on the room and customer wishes.

Model S-15
Model O
STEINWAY & SONS Model iw-26v