Polk Audio 255C-RT is a 2-way Passive In-wall In-wall speaker by Polk Audio. It was released in 2016. It features a 1" Soft-Dome Tweeter and 2 x 5.25" Polymer Composite Woofer. The speaker has a frequency range of 50-25kHz and a sensitivity of 90 dB. Polk Audio 255C-RT has an MSRP of 398$ per pair.
Room Size Suitability
The size of the room where you plan to use the Polk Audio 255C-RT is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Poor |
| Small Room | Average |
| Mid-size Room | Good |
| Large Room | Average |
| Very Large Room | Poor |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)
Polk Audio's RT Series of Loudspeakers
255C-RT is a member of Polk Audio's RT series of Passive speakers. The RT range are Polk Audio's in-ceiling and in-wall custom-install speakers. Below you can see the main specs of these speakers.
Polk Audio RT Series Speakers
Frequency Response of the Polk Audio 255C-RT Speaker
Polk Audio 255C-RT has a Frequency response range of 50-25kHz and Power Range of 10-150 watts. With a minimum frequency of 50 Hz, 255C-RT delivers moderate bass depth so depending on your use case, you might want to consider adding a subwoofer to your system.
Here we have a comparison of how 255C-RT's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
In-wall Speakers
Thinking about a subwoofer for the Polk Audio 255C-RT?
Impedance and Sensitivity
Polk Audio 255C-RT's nominal impedance level is
8 ohms and has a sensitivity of
90 dB.
Sensitivity
In-wall Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Polk Audio 255C-RT is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
90dB of the Polk Audio 255C-RT is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the Polk Audio 255C-RT plays in your room →
What amplifier does the Polk Audio 255C-RT need?
At normal listening levels in a medium room, about
7.5–120 W
per channel into 8 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $500, or every amplifier we cover.
Input Type
255C-RT features Spring post type connectors. Bi-amping and Bi-wiring are not possible.
Work out what gauge speaker cable this run needs →
Polk Audio 255C-RT External Dimensions and Weight
Polk Audio 255C-RT has external dimensions of (Height x Width x Depth) 7.5625-inch x 13.0625-inch x 0.0000-inch (193.0 x 332.0 x 98.4mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of Polk Audio 255C-RT is approximately 326.7cm2 / 50.6inch2.
To get a better perspective on the real life size of Polk Audio 255C-RT, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).
Polk Audio 255C-RT Speaker Size Compared to a Compact Disc
Find speakers that fit your shelf or alcove →
Cabinet type and Materials
Polk Audio 255C-RT has a
In-wall type cabinet.
What's in the Box of Polk Audio 255C-RT?
Here are the items that are included inside the box of 255C-RT:
- In-wall center-channel loudspeaker
- White metal grille
- Mounting template
- Owners Manual
- Sheer-Grille Painting instructions
- Online Registration Card
- Polk Audio product brochure
Recommended Accessories
Here is a list of accessories that we think you may need for the Polk Audio 255C-RT.
Warranty
Lifetime of parts warranty and Lifetime of labor warranty is generally provided by the manufacturer.