Vanishing Series In-Ceiling Loudspeakers: The Polk Audio
Vanishing Series 70-RT is a high performance in-ceiling loudspeaker designed to
bring high-quality music to any room or transitional space in your home. It's
Polk Audio's smallest, most "invisible" full-range in-ceiling speaker. The Polk
Audio 70-RT's lightweight polypropylene cone & sensitive silk dome tweeter can
be angled for superior off-axis performance. The innovative addition of the
woofer driver behind the main speaker adds depth & dynamics to this compact
in-ceiling speaker. The in-ceiling speaker's Reflective Room Compensation Switch
digitally compensates for "reflective" rooms, giving you placement flexibility.
Dynamic Balance Technology: Laser-imaging technology allows
Polk Audio engineers to see the entire vibrating surface of a driver and
tweeter. This allows the engineers to actually see performance-robbing
distortion develop on the speaker cone. Using this data, they can determine the
Dynamic Balance of their high-tech materials, and alter the geometry and
construction of the speaker to effectively tune out the offending resonance.
Exclusive Dynamic Balance Composite Material Technology delivers sound that is
effortlessly clean and clear, even at lifelike volume levels.
Klippel Optimized Motor Structures: The Klippel Distortion
Analyzer allows Polk engineers to optimize each driver's motor structure, voice
coil alignment and suspension to insure smooth, unimpeded movement even at
extreme listening levels. This is especially important in the shallow depth area
afforded an in-ceiling loudspeaker.
Full-Range 3-Way Driver Array: The Vanishing Series 70-RT in-ceiling
loudspeaker employs a new innovative patent-pending design from Polk that's like
having a full-range, full-size speaker in a small inset lighting fixture. To do
this, Polk designed a deep well and mounted a 'Cassini Oval' woofer above &
behind the main driver array. By
adding a woofer for low frequency response, the midrange & tweeter is
freed up to provide more efficient detail. This
innovative deep diagonal positioning allows the 70-RT cutout to be just 6.5" in
diameter. This full-range 3-way driver array results in the kind of broad
coverage and big performance usually achieved only with bigger box speakers. The
70-RT in-ceiling loudspeaker features the following three drivers.
- Tweeter: One 0.75" Dynamic Balance silk/polymer
- Midrange: One 2.5" Dynamic Balance mineral filled
- Woofer: One 5"x7" Dynamic Balance 'Cassini Oval'
mineral filled polypropylene woofer.
Reflective Room (Tweeter) Compensation Control: An
easily accessible Reflective Room (Tweeter) Compensation switch allows you to
make detailed adjustments to optimize the sound for any installation. The switch
can be used to digitally compensate for harsh reflective surfaces. The switch
doesn't merely reduce high frequencies, it actually allows you to "notch-out" a
specific area of the spectrum (3,500-6,000Hz) where room acoustics most often
interfere with performance. The switch has two settings:
- Reflective Setting: If your listening room is very
reflective, with smooth sheetrock walls, hardwood floors, and non-cushioned
furniture, the sound will be overly "bright" and unnatural. Selecting the
"Reflective" setting compensates for the effect of reflectivity in a hard
room. Tweeter attenuation flattens room response, without hindering higher
frequency response, for warmer, more realistic sound and more accurate
- Normal Setting:
If your room is not reflective, with curtains, artwork, lots of
cushioned furniture and carpeting, sound will be absorbed by the room,
resulting in more realistic reproduction and more accurate imaging. In this
case, select the Normal setting.
Timbre-Matched: The Polk Audio Vanishing Series RT in-ceiling
loudspeakers have been timbre-matched with Polk's RTi Series loudspeakers.
Timbre-matching with the same internal components, and the same lightweight
polymer composite cone material, insures utterly seamless blending from speaker
to speaker. Timbre-matched speaker components will insure the same true response
throughout your system.
Frequency Response: The overall frequency response of the
in-ceiling speaker is 34Hz to 27kHz, and the -3dB frequency response is 48 to
Dual Bandpass Ports: Bandpass Ports are the way to go when
you want high efficiency in small enclosures. The Vanishing Series in-ceiling
speaker employs dual Bandpass Bass Ports, smoothly funneling the angled woofer's
detailed low-frequencies down around the midrange and tweeter array. The port
design eliminates "chuffing", so the small, practically invisible in-ceiling
speakers achieve superior full-range blending and broad coverage with
surprisingly deep bass.
15° Angled Baffle: A 15°
angled baffle allows you to direct the mids & highs for the particular
application; simply by rotate the speaker in the desired directions and tighten
down the rotating cams.
Wafer-Thin Sheer-Grille: The Polk Audio Vanishing Series
in-ceiling speakers feature Polk's exclusive wafer-thin Sheer-Grille, a
magnetically secured 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 perfs, and are acoustically inert, for dynamic,
unimpeded sound and more uniform coverage, even in larger rooms.
Note: When painting the grille, it is highly recommend
that you use a can of spray paint matched to the color of the surrounding
ceiling. Brushes or rollers should not be used to paint the grille, as this
will clog the perf holes.
Gold-Plated Spring-Loaded Posts: The 70-RT has a
gold-plated pair of spring-loaded binding posts that can accept up to 12-gauge
wire, single banana plugs, or pin connectors.
Applications: You can use the Polk Audio Vanishing Series
in-ceiling loudspeaker as in-ceiling rear surrounds to complete an RTi Series
speaker system, or for superior dynamics in practically invisible multi-zone
Rotating Cam System: The speaker utilizes a rotating cam
system to ensure a secure, vibration-free installation. There are four rotating
cams to hold the speaker securely to the ceiling.
Note: There is an eyebolt on the back of the speaker that can be
used for an extra measure of installations security.
Installation: The 70-RT can be installed in new or existing
- Existing Construction: In existing ceilings, use the
included cardboard template for one-cut, drop-in simplicity.
- New Construction: Pre-construction brackets (107PB50,
sold separately) are available for new-build or open-ceiling retro-fitting.
||Model # 70-RT
Depth = 8.625"
||Diameter = 6.5"
|Total Mounting Depth
||Depth = 8.5"
|Mounting Depth (using 1/2
||Depth = 8"