In-Wall Surround

This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


Customizable in-wall surround speaker.

21 13/16" H x 10 3/4" W x 4 1/4" D
55.40cm H x 27.30cm W x 10.79cm D

Available Finishes:
Additional Images

High Performance In-Wall F/X Surround Channel Speaker

If you already have a serious two-channel sound system, built with Polk Audio’s LSi or LSiM Series loudspeakers, you need the LCi-RTSF/X rear surround in-wall speaker to take one important step toward building the ultimate home theater system. With timbre-matched components, like the ring radiator tweeter, for seamless blending realism with these other Polk speakers, and exclusive on-board audio customization tools, the LCi-RTSF/X rear surround in-wall speaker gives you the flexibility to enjoy to the best in home theater thrills. And bonus: It takes up absolutely no room real estate!

LCi-RTSF/X Features:

A dual midrange and tweeter array, set at precise angles, disperse sound over an extremely wide area to create a more diffuse, more enveloping rear-surround sound pattern.

An easilly accessible Solid/Diffuse Switch affords greater placement flexibility for the surround effect you desire. In “Solid” mode, all drivers and tweeters are in-phase, producing solid, discrete sound-staging (this is the THX default setting). In the “Diffuse” setting, the rear-facing tweeter array is out of phase with the front facing array, for more diffuse and un-localizable surround imaging.

Exclusive integrated performance enclosure design ensures “perfect volume” performance in an enclosure that is the same size as the wall cut-out you’ll make, so installing them in existing walls is just as easy as naked stud installations in new-build situations.

The Stud-Lock mounting system (included with LCi-RTS105, LCi-RTS100, LCI-RTSF/X models) creates a rigid platform and snug fit that cuts performance-robbing resonances and structural vibrations to increase dynamic range, clarity and ultimate sound quality.

Interchangeable grilles: Choose paintable aluminum-mesh with 75% open space for unrestricted performance, or the acoustically transparent cloth grille to experience the full-on THX Ultra2 performance level.

Paintable grilles let you build them in, and then forget all about them; LCi-RTS Series practically disappear into any room.

Enhanced, reengineered ring radiator tweeters with specially designed faceplate geometry extend top-end response for incredible details and excellent imaging even in off-axis listening positions.

Our aerated polypropylene cone is the ideal balance of lightweight stiffness (for more efficient action with less distortion-causing flex) and superior damping properties, for spectacular midrange clarity and punchy bass. Dual driver designs (in all LCi-RTS models except the LCi-RTSF/X) more efficiently deliver superb mid-range clarity and punchy bass.

Polk Audio’s proprietary, patented Dynamic Balance® technology allows our engineers to design out distortion-causing driver and system resonances, so you only hear the good sounds.

Enclosure stiffening technology reduces distortion and eliminates wasted energy for louder, cleaner performance than any other in-wall speakers.

Specially engineered crossover networks feature more sophisticated notch filters (instead of mere resistors).

Easily accessible custom audio controls allow you to tweak your sound for optimum performance in any installation: Use the reflective room (tweeter) compensation switch to digitally compensate for harsh reflective surfaces, and the wall distance setting toggle to compensate for proximity to corners or adjacent walls.

Solid, resonance-free construction features, including molded composite baskets and a secure pole plate (which physically joins the speaker’s motor structure to the Enclosure) ensure zero-vibration performance. With no wasted energy, LCi-RTS Series speakers deliver a much more efficient performance, even at tremendous volume levels.

LCi-RTS Series speakers are timbre-matched to Polk Audio LSi speakers to insure utterly seamless blending from speaker to speaker in systems that combine traditional and built-in speakers.

All Polk Audio products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk Audio loudspeakers are built to perform for a lifetime.

Driver Complement

Diameter3/4" (1.91cm) 
TypeRing radiator 
Diameter3 1/4" (8.26cm) 
TypeDynamic Balance driver with aerated polypropylene cone 
Mid / Woofer
Diameter6 1/2" (16.51cm) 
TypeDynamic Balance driver with aerated polypropylene cone 


Total Frequency Response50Hz-27kHz 
Upper -3dB Limit26 kHz
Lower -3dB Limit80 Hz
Nominal Impedance4 ohms
Efficiency88 dB
Recommended Amplifier Power10-250 watts per channel
InputsHeavy duty spring-loaded posts 


Cut-Out Width10 3/4" (27.30cm) 
Cut-Out Height20 1/4" (51.44cm) 
Height21 13/16" (55.40cm) 
Width12" (30.48cm) 
Mounting Depth (includes 1/2" drywall)3 3/4" (9.53cm) 
Pre-Construction BracketPB 105 
Overall Depth4 1/4" (10.79cm) 
Product Weight (each)10.75 pounds


Unit of Measurepair 


Speaker WarrantyLifetime 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

LCi-RTS F/X Media

LCi-RTSF/X Accessories