Vanishing Series In-ceiling Speakers: The Polk Audio
Vanishing Series in-ceiling loudspeakers feature a
precision-engineered, minimally flanged design and Polk's exclusive Sheer-Grille,
which protrudes only 7mm from its surroundings. Installing virtually flush in
your ceiling, the Polk Audio Vanishing Series in-ceiling loudspeakers
offer a one-cut, drop-in installation and rotating cam stabilizing system. The
Vanishing LS series in-ceiling speakers are timbre-matched to Polk Audio's flagship LSi
and LSiM series loudspeakers for seamless blending from speaker to speaker when
you're building a speaker system.
Cassini-Oval Woofer: This Polk Audio Vanishing Series 900-LS
in-ceiling surround loudspeaker employs a rear-mounted 6" x 9" Dynamic Balance
polypropylene Cassini-Oval cone woofer, with rubber surround, for a smooth, consistent frequency
response. The oval woofer is mounted at an angle in the enclosure, behind the
midrange and tweeter, and ported out the front.
3-1/4" Midrange: The 900-LS has a 3-1/4" Dynamic Balance
aerated polypropylene cone midrange. The aerated polypropylene cone is 20% lighter than conventional
polypropylene, and 35% lighter than aluminum, to give you clear midrange and high efficiency. Polk Audio's patented Dynamic Balance technology
eliminates unwanted resonances.
Ring Radiator Tweeter: The 900-LS employs a 3/4"
Dynamic Balance ring radiator tweeter for detailed highs and superb imaging.
Wall Distance Toggle Switch: If you mount your in-ceiling
loudspeakers closer than 2 feet from a side wall, the proximity of the surface
can elevate the midbass response between 50 and 200Hz, causing a boomy sound. To
compensate, the 900-LS is equipped with the Vanishing Wall Distance Toggle
switch, located on the front panel. The filter adjusts the crossover to flatten
the response, and tune out the boominess, without sacrificing the deep bass
response of the speaker. The switch is labeled "Wall Dist." with two positions:
in (<2') and out (>2')."
Reflective Room Compensation Control: The Reflective Room
Compensation Switch, conveniently located on the front panel, allows you to
digitally compensate for harsh reflective surfaces, such as smooth walls, glass
windows, and hardwood floors. The filter doesn't merely reduce high frequencies,
it simply cuts the level only in the 4-5kHz range where room acoustics most
often interfere with performance. The switch is labeled "Room" with two
positions: out (normal) and in (reflective).
Frequency Response: The overall frequency response of the
in-ceiling loudspeaker is 28Hz to 33kHz, and the -3dB frequency
response is 40 to 29kHz.
Sheer-Grille: The 900-LS features Polk Audio's exclusive wafer-thin Sheer-Grille, a
magnetically-secured metal grille that protrudes only 7mm from its surroundings. The Sheer-Grille can be painted to match your décor, making it virtually
indistinguishable from its surroundings. The Sheer-Grille has nearly
transparent, ultra-small perforations, and is acoustically inert, for dynamic,
unimpeded sound and more uniform coverage, even in larger rooms. The grille
diameter is 9-5/8.
Gold-Plated Spring-Loaded Posts: The in-ceiling loudspeaker has a gold-plated pair of spring-loaded binding posts that can
accept up to 12-gauge wire, single- or dual-banana plugs, or pin connectors.
Applications: The Polk Audio Vanishing Series
900-LS in-ceiling loudspeaker is designed to be used as part of a hidden
two-channel stereo pair or in a 5.1- or 7.1-channel home theater configuration.
At only 9-5/8" in diameter, the speaker makes a minimal visual impact.
Note: The speaker isn't recommended for installation in
Security Eyebolt: The speaker has an eyebolt attached to the
speaker magnet. This eyebolt is designed to be used as an extra measure of
installation security. The majority of the speaker weight should be supported
from behind by attaching a wire or hook to the eyebolt and to the ceiling
Rotating Cam System: The Polk Audio in-ceiling loudspeakers
utilize a rotating cam system to ensure a secure, vibration-free installation.
Each 900-LS has 4 rotating cams to hold the speaker in place. The cams can be
tightened from the front panel with a Phillips-head screwdriver.
Installation: The 900-LS can be installed in new or
- Existing Construction: In existing ceilings, use the included
cardboard template for one-cut, drop-in simplicity. Achieve secure,
vibration-free efficiency with a simple turn of Polk's Rotating Cam system
(4 rotating cams).
- New Construction: The optional
LC60i pre-construction brackets should be used for new-build or open-wall retro-fitting.
|Overall Dimensions (with grille)
||Diameter = 9-5/8"
||Diameter = 8-3/16"
|Mounting Depth (behind 1/2"
||Depth = 8-7/8"