Polk Audio Signature S55 is a 2-way Passive Bass Reflex Floor-standing speaker by Polk Audio. It features a 1" Dome Tweeter and 2 x 6.5" Mica-reinforced polypropylene Woofer. The speaker has a frequency range of 32-40k Hz and a sensitivity of 90 dB. Polk S55 has an MSRP of 658$ per pair.
What size of room is the Polk S55 speaker good for?
The size of the room in which you are planning to use the Polk S55 is an important decision factor. Here we have evaluated its suitability to various sizes of environments considering its size and max power parameters:
| Listening Environment* |
Suitability |
| Near-field | Bad |
| Small Room | Poor |
| Mid-size Room | Good |
| Large Room | Good |
| 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 later replaced S55 with ES55. Follow the link to read our in-depth comparison of these speakers:
Compare Polk S55 vs Polk ES55
What are the speakers in Polk Audio's Signature S Series?
S55 is a member of Polk Audio's Signature S series of Passive speakers. Below you can see the main specs of these speakers.
Polk Audio Signature S Series Speakers
Polk Audio Signature S Series Speakers
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.
What is the Frequency Response of the Polk S55 speaker?
Polk S55 has a Frequency response range of 32-40k Hz at ±3dB and Power Range of 20-200 watts. At a minimum frequency of 32 Hz, S55 will provide a deep bass that will probably satisfy majority of listeners, especially for music. Movie lovers and music listeners who like to experience a full range response will still benefit from the use of a subwooofer though.
To focus on the subwoofers that are in a similar price range with Polk S55, check out the Powered Subwoofers under $750. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how S55's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
Polk S55's Mica-reinforced polypropylene Woofer
Polk S55's Terylene Dome Tweeter
What is the Crossover frequency of Polk S55?
The Crossover frequency of the S55 is set to 2500Hz. This is the threshold frequency where the higher frequency signals over this level are sent to the tweeter and the lower-frequency signals are sent to the woofer by the crossover component.
What are the Impedance and Sensitivity of the Polk S55? Is it an easy-to-drive speaker?
Polk S55's nominal impedance level is
8 ohms and has a sensitivity of
90 dB.
Sensitivity
Floor-standing Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Polk Audio Signature S55 is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
90dB of Polk Audio Signature S55 is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise.
Check the amplifiers that are in a similar price range to the Polk S55:
Input Type
S55 has 5-way post type connectors and lets bi-amping/bi-wiring. Bi-wiring can provide improvements in the overall transparency of your loudspeakers by running separate speaker wires to the low & high frequency drivers from a single amplifier. Bi-amping allows the use of separate amplifiers for the high & low frequency drivers of your loudspeaker which may result in greater dynamic range & lower distortion.
Polk S55's 5-way post terminals allows Bi-amping or bi-wiring
Polk S55 External Dimensions and Weight
Polk S55 has external dimensions of (Height x Width x Depth) 41-9/16 x 11-3/4 x 12-3/8inch (1056.0 x 299.0 x 315.0mm ).
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 S55 is approximately 941.9cm2 / 146.0inch2.
WeightThe Polk S55 weighs 20.00kg / 44lbs per piece. Here is a comparison of how S55's weight compares with the average, max and min weights in its class.
Weight
All Floor-standing Speakers
Weight
Floor-standing Speakers under $750
Cabinet type and Materials
Polk S55 has a
Bass Reflex type cabinet and a Meddite MDF finish. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.
Speaker Feet
Polk S55 comes with
4 Feet (pre-installed) which you can use to secure your loudspeaker on the surface that you are putting on. It is always recommended to use some kind of feet under all types of speakers. Besides limiting the movement of the speakers, it also compensates for non-flat surfaces and limits the contact surface area of the speaker. Rubber based feet also help isolating the vibrations within certain frequency ranges.
Polk S55 Feet
Port Position
Polk S55 is a bottom-firing port speaker
Polk S55 Port
Available colors
Polk S55 is available in Black.
Does the Polk S55 come with a Grille?
S55 comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.
Polk S55 with Grille
What's in the Box of Polk S55?
Here are the items that are included inside the box of S55:
Floorstanding loudspeakerGrille (attached)4 Feet (pre-installed)Owners ManualOnline Product Registration
Recommended Accessories
Here is a list of accessories that we think you may need for the Polk Audio Signature S55.
User's Manual
For more information about how to setup, use and maintain the Polk Audio Signature S55, use the direct link below to download the official manual document:
Download User Manual for Polk S55
Official Brochure
Here is a link to download the official brochure for the Polk Audio Signature S55 speaker:
Official Brochure for Polk S55
Official Product Page
Official manufacturer's product page for the Polk Audio Signature S55 speaker can be found below:
Official Product Page for Polk S55
Warranty
5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.