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


Full-range bandpass dual-port in-ceiling loudspeaker.

7 3/4" Diameter
19.68cm Diameter

Available Finishes:
Additional Images

Innovation & Invisibility, on a Budget

The 50-RT is our smallest, most “invisible” full-range in-ceiling speaker. It’s packed with technology and built with performance in mind. Its lightweight polypropylene cone and sensitive silk dome tweeter can be angled for superior off-axis performance. Plus, its reflective room compensation switch dampens the effect of “reflective” rooms, affording you extraordinary placement flexibility. The innovative addition of the woofer driver behind the main speaker adds unparalleled depth and dynamics to this tiny performer. Perfect for bringing dynamic music to any room or transitional space in your home.

Vanishing 50-RT Features:

The smallest-diameter full-range 3-way driver array means you get full-size speaker performance in a speaker the size of a small inset lighting fixture.

Extra deep well design with a Cassini oval woofer mounted above and behind the main driver & tweeter array, for broad coverage and dynamic full-range audio performance in a small diameter built-in.

Vanishing® Series built-in speakers feature our exclusive wafer-thin Sheer-Grille™, a magnetically-secured grille that protrudes only 7mm from its surroundings. Sheer-Grilles have nearly transparent, ultra-small perfs, and are acoustically inert, for dynamic, unimpeded sound and more uniform coverage, even in larger rooms.

Painted to match your décor, Vanishing Series built-in speakers are virtually indistinguishable from their surroundings.

Reflective surfaces in rooms can make sound brighter and cause image distortion. Engaging the Vanishing reflective room compensation feature (by selecting the low setting) lowers the tweeter level to compensate for reflective surfaces. Vanishing reflective room compensation is a custom audio control that cuts the level only in the 4-5kHz range, exactly where reflectivity destroys sound quality. Outside this narrow 1kHz band, the tweeter retains its detailed and accurate high frequency response, for no loss of realistic musical details.

Vanishing Series RT speakers are timbre-matched to Polk RTi speakers to insure utterly seamless blending from speaker to speaker in systems that combine traditional and built-in speakers.

PowerPort® bass venting is Polk's patented design for smoothly transitioning the air flow from the port into your listening area, eliminating turbulence and distortion, for bigger, more efficient, deep bass impact.

Easy one-cut, drop-in installation puts built-in audio within reach, with Perfect Fit templates, a precision flange, and (available) pre-construction brackets; achieve secure, vibration-free efficiency with a simple turn of the patented Rotating Cam system.

All Polk 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 testing. Polk loudspeakers are built to perform for a lifetime.

Driver Complement

Diameter3/4" (1.91cm) 
TypeSilk/polymer dome 
Diameter2 1/2" (6.35cm) 
TypeDynamic Balance driver with mineral-filled polypropylene driver 
Diameter5" (12.70cm) 
Type Dynamic Balance woofer with mineral-filled polypropylene cone 


Total Frequency Response35Hz-27kHz 
Upper -3dB Limit28 kHz
Lower -3dB Limit52 Hz
Nominal Impedance8 ohms
Efficiency89 dB
Recommended Amplifier Power10-100 watts per channel
InputsGold-plated spring-loaded posts 


Cut-Out Diameter6" (15.24cm) 
Overall Diameter7 3/4" (19.68cm) 
Mounting Depth (includes 1/2" drywall)8 1/2" (21.59cm) 
Pre-Construction BracketPB 450 
Overall Depth9" (22.86cm) 


Unit of Measureeach 
Total Shipping Weight6.5 pounds


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.

50-RT Media

50-RT Accessories

PB 450

PB 450

$44.00 each

Works with Vanishing Series 500-LS, 50-RT