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Polk Audio® Reserve™ R900 4" Black On-Wall Speakers
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 0
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 1
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 2
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 3
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 4
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 5
Polk Audio® Reserve™ R900 4" Black On-Wall Speakers 6

Polk Audio® Reserve™ R900 4" Black On-Wall Speakers

Model #: R900-Black
Polk Audio
At a Glance
Add R900 height modules to access an IMAX-enhanced world of multidimensional sound. Its unique design means that it can sit atop other Reserve Series speakers or be mounted to the wall, unlocking the Dolby Atmos and DTS:X capabilities of the Reserve™ Series.
Available in Store Only

Get to know this product.

What Better Sounds Like

Whether they're mounted on your wall or placed atop your Reserve Series loudspeakers, the R900s ensure exceptional 3D Dolby Atmos, DTS:X and IMAX Enhananced performance that make eligible movies, music and games sound incredible.

Amazing Sound and Elegance

Designed to perfectly complement the Reserve series, this optional height module adds exceptionally realistic sound without the hassle of installing speakers in the ceiling.

Pinnacle Ring Radiator Tweeter

The Pinnacle Ring Radiator Tweeter’s distinctive pointed shape guides the dispersion of high frequency sounds around a room. This innovation widens the sweet spot and allows you freedom to enjoy your music and movies wherever you choose to sit.

Turbine Cone Woofer

Our pioneering turbine design delivers a significant increase in cone rigidity without increasing mass. This innovation means the woofer can move with increased accuracy and speed to deliver enhanced sound resolution, enabling you to experience a breathtaking level of detail in your music and movies.

Timbre Matched For Premium Performance

Designed with the same driver components of the Reserve series speakers, you can mix and match to create the ultimate home theater setup.

Flexible Placement

The Polk Reserve R900 height module is Dolby Atmos certified and designed to meet DTS:X specification. With the ability to wall mount or place on top of a compatible Reserve speaker, this height module allows convenient flexibility. Flip the switch on the back of the speaker to select the desired position and the speaker will automatically adapt to the optimal performance.

R900 Height Module

Exceptional 3D movie, music, and game sound.

3D Audio Compatible

Delivers 3D audio found in Dolby Atmos, Dolby Atmos height virtualization, DTS, DTS:X, DTS Virtual:X, and IMAX Enhanced soundtracks.

Anti-Diffraction Grille Included

Acoustically inert grilles offer a clean aesthetic without sacrificing sound.

Power Recommendations

45W to 100W or more per channel power amplification is recommended to experience the best quality and performance from this speaker.



Speaker TypeHeight Module
UOM (Sold As)Pair


Tweeter0.75" Pinnacle Ring Radiator
Woofers4” Turbine Cone
Overall Frequency Response50 – 50kHz (when wall mounted)
Frequency Response (-3dB limits)70 – 32kHz (when wall mounted)
Recommended Amplifier Power45 - 100W
Amplifier Output Compatibility8Ω / 6Ω / 4Ω
Minimum Impedance (ohms)4.2Ω
Sensitivity (2.83V/1m)85.5dB (when wall mounted)


Tweeter/Mid-range Crossover Frequency2100


Product Dims W x H x D (Includes width of feet)166 x 158.3 x 320mm 6.5 x 6.2 x 12.6 in
Product Weights (each)6.6 lbs/3 kg
Shipping Weight16 lbs/7.3 kg


Wall-Mountable (keyhole slots)Yes
Binding Posts: Nickel-plated 5-WaySingle

Certifications (Non-Safety and Regulatory)

Hi-Res CertifiedYes

Misc. Specs

Product Weight (lbs.)6.6
Frequency Response70-32kHz
Color Finish NameBlack
Manufacturer Warranty5 Year
Mounting TypeWall or speaker mounted
CollectionReserve™ R900
Shipping Depth (in.)10.2
Shipping Width (in.)16.3
Shipping Height (in.)14.6
RMS Power Handling (Watts)100
Enclosure TypeSealed
Impedance4 Ohms
Number of Speakers2
Speaker TypeOn-Wall Speakers
Depth (in.)12.6
Height (in.)6.2
Width (in.)6.5
WarningProposition 65 Warning for California Residents