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Polk Audio Signature S55 Review
Polk Audio Signature S55

Main Features

  • 1" Dome Tweeter
  • 2 x 6.5" Mica-reinforced polypropylene Woofer
  • 32-40k Hz Frequency Response
  • 90 dB Sensitivity
  • Impedance: 8ohms
  • Power Range: 20-200watts
  • Weight:44.00 lbs / 20.00 kg
  • Dimensions(HxWxD): 41-9/16"x11-3/4"x12-3/8" / 1056.0 x 299.0 x 315.0mm
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Polk S55 Review
Polk S55 Polk S55
See at AMAZON

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-fieldBad
Small RoomPoor
Mid-size RoomGood
Large RoomGood
Very Large RoomPoor

(* 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
Model Frequency SensitivityImpedance Woofer
Polk S60
Compare
26-40k Hz 90 dB8Ω 3 x 6.5"
Polk S20
Compare
39-40k Hz 88 dB8Ω 1 x 6.5"
Polk S15
Compare
50-40k Hz 88 dB8Ω 1 x 5.25"
Polk S10
Compare
67-40k Hz 87 dB8Ω 1 x 4"
Polk S55
32-40k Hz 90 dB8Ω 2 x 6.5"
Polk S50
Compare
33-40k Hz 89 dB8Ω 2 x 5.25"
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
Polk S55
Min
Average
Max
High Frequency
Floor-standing Speakers
Polk S55
Min
Average
Max
Polk S55 Woofer
Polk S55's Mica-reinforced polypropylene Woofer



Polk S55 Tweeter
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
Polk S55
Min
Average
Max

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:

  • Integrated Amps under 500 USD
  • Integrated Amps under 750 USD
  • Integrated Amps under 1000 USD
  • All Integrated Amplifiers

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 Terminals
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.

Weight

The 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
Polk S55
Min
Average
Max
Weight
Floor-standing Speakers under $750
Polk S55
Min
Average
Max

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
Polk S55 Feet

Port Position

Polk S55 is a bottom-firing port speaker

Polk S55  Port
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
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 loudspeaker
  • Grille (attached)
  • 4 Feet (pre-installed)
  • Owners Manual
  • Online Product Registration
  • Recommended Accessories

    Here is a list of accessories that we think you may need for the Polk Audio Signature S55.

    • Speaker Cable and Connectors
      • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
      • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
      • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
    • Vibration Isolators: IsoAcoustics isolatorsmore affordable options too.
    • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

    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.

    Polk Audio Signature S55 Alternatives in Passive Floor-standing Speakers
    Model Type Sensitivity Impedance Frequency
    Klipsch R-620F
    Compare
    2-way 96 dB 8 ohms 38-21k Hz
    Polk S60
    Compare
    2-way 90 dB 8 ohms 26-40k Hz
    Klipsch R-610F
    Compare
    2-way 94 dB 8 ohms 45-21k Hz
    Polk XT60
    Compare
    2-way 86 dB 8 ohms 38-40k Hz
    Jamo S 809
    Compare
    2-way 90 dB 8 ohms 37-26k Hz
    Wharfedale Diamond 12.3
    Compare
    2-way 88 dB 8 ohms 45-20k Hz
    Jamo C 95 II
    Compare
    2-way 89 dB 6 ohms 37-24k Hz
    Polk ES50
    Compare
    2-way 88 dB 8 ohms 38-40k Hz
    Polk ES55
    Compare
    2-way 89 dB 8 ohms 34-40k Hz
    Polk XT70
    Compare
    2-way 86 dB 8 ohms 35-40k Hz
    Frequently Asked Questions about Polk Audio Signature S55
    What is the External Dimensions of Polk Audio Signature S55
    What is the Speaker Sensitivity of Polk Audio Signature S55
    is the Polk Audio Signature S55 an easy to drive speaker?



    Polk S55 Detailed Specifications

    General
    BrandPolk Audio
    Full Model NamePolk Audio Signature S55
    Speaker Type2-way Floor-standing
    Power Range20-200 watts
    Sensitivity90 dB
    Impedance8 ohms
    Frequency Response32-40k Hz
    DRIVERS
    Woofer Size6.5-inch
    Woofer CompositionMica-reinforced polypropylene
    Woofer SurroundButyl rubber
    Tweeter Size1-inch
    Tweeter TypeDome
    Crossover freq2500Hz
    Port Positionbottom

    CONNECTIONS
    Connector Type5-way post
    Biamp InputsYes
    Port Positionbottom
    PHYSICAL SPECS
    Height1056.0mm ( 41-9/16-inch)
    Width299.0mm ( 11-3/4-inch)
    Depth315.0mm ( 12-3/8-inch)
    Height1056.0mm ( 41-9/16-inch)
    Weight20.00kg ( 44.00 lbs)
    EnclosureBass Reflex
    FinishMeddite MDF
    Available ColorsBlack
    Mounting BracketNo
    GrilleYes
    Moisture ResistanceNo
    OTHER
    Handheld RemoteNo
    Parts Warranty5 Years
    Labor Warranty5 Years
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