Polk Audio® Vanishing® Series 9" White In-Ceiling Speaker

Polk Audio
At a Glance
A big speaker that delivers big sound, yet vanishes into your room's decor. The 90-RT is perfect for use as stealth mains, rears and side surrounds in a high performance home theater, or for bringing dynamic sound to alternate zones from your main stereo listening room.
Available in Store Only

Get to know this product.

  • 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.
  • Dual band-pass bass ports are highly efficient in small enclosures, and smoothly funnels the angled woofer's low frequencies down around the driver array, eliminating "chuffing," so your small, practically invisible in-ceiling speakers achieve superior full-range blending and broad coverage with surprisingly deep bass.
  • 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.
Useful Documents


Connector Type:Gold-Plated Pair of Push Connectors


Tweeter Composition:Silk Dome
Midrange Size:3.25"
Driver Component Size:9"


Mount Depth:8.88


Sold As:Each


Sensitivity:90 dB
Speaker Type:In-Ceiling Speaker
Frequency Response:30Hz - 27,000Hz




Total Pieces1


Included Accessories(1) Polk’s Wafer-thin Sheer Grille™ - White, Paintable
Optional Accessories(1) PB LC60i - Pre-Construction Bracket - Sold Separate

Shipping Cartons

Carton 111.25" (28.58 cm) h x 13.25" (33.66 cm) w x 15.25" (38.74 cm) d - 9.5 lbs (4.31 kg)


Lifetime WarrantyYes

In-Ceiling Speaker

Quantity Included1
Depth9.28" (23.57 cm)
Driver Complement(1) 3.25" (8.26 cm) d (Round) Dynamic Balance driver with mineral-filled polypropylene cone - Midrange; (1) 0.75" (1.91 cm) d (Round) Silk/polymer dome - Tweeter; (1) 9" (22.86 cm) d (Round) Dynamic Balance woofer with mineral-filled polypropylene cone - Subwoofer
Grille Dimensions9.63" (24.46 cm) diameter

In-Ceiling Mount

Dimensions8.19" (20.8 cm) diameter

Audio Quality

Total Frequency Response30 Hz → 27,000 Hz
Nominal Impedance8 ohms
Sensitivity (1 watt @ 1 meter)90 dB
Lower and Upper -3dB Limits43 Hz → 25,000 Hz

External Amplifier

Recommended Amplifier Power Per Channel10 watts → 125 watts


Speaker Inputs(1) Pair of Push Connectors - Gold-Plated

Misc. Specs

Color Finish NameWhite
RMS Power Handling (Watts)125
Impedance8 ohms
Maximum Power Handling (Watts)125
Number of Speakers1
Speaker TypeIn-Ceiling Speakers
Bass CompositionMineral-Filled Polypropylene Cone
Bass Size (in.)9 in.
Depth (in.)9.38
Midrange CompositionMineral-Filled Polypropylene Cone