In this review, we will be comparing S20 and L100, two Passive Bookshelf speakers by Polk Audio
Let's have a brief look at the main features
of Polk S20 and Polk L100 first before getting into our more
detailed comparison.
Polk S20 Key Specs
- 2-way Design
- 1" Soft-Dome Tweeter
- 6.5" Mica-reinforced polypropylene Woofer
- 39-40k Hz Frequency Response
- 88 dB Sensitivity
- Impedance: 8ohms
- Power Range:20-125watts
- Weight:7.73kg
- Dimensions (H x W x D): 376.0" x 8.5" x 13.7"( 376.0 x 216.0 x 350.0mm )
Polk L100 Key Specs
- 2-way Design
- 1" Ring Radiator Tweeter
- 5.25" Polypropylene Woofer
- 57-38k Hz Frequency Response
- 85.5 dB Sensitivity
- Impedance: 4ohms
- Power Range:30-160watts
- Weight:7.68kg
- Dimensions (H x W x D): 348.0" x 7-7/8" x 11-5/16"( 348.0 x 201.0 x 288.0mm )
What size room are the Polk S20 and Polk L100 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision
factor. Here we have compared their suitability to various sizes of environments considering their size
and max power parameters:
| Listening Environment* |
Polk S20 |
Polk L100 |
| Near-field |
Poor |
Poor |
| Small Room |
Average |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Average |
Average |
| Very Large Room |
Poor |
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.)
In the following sections, we will get into more detail in order to better understand how the Polk S20 and Polk L100 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**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.
Drivers
Both S20 and L100 are 2-way speakers.
| Driver |
Polk S20 |
Polk L100 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 5.25-inch
|
S20 features a 1" Terylene Soft-Dome Tweeter and 1 x 6.5" Mica-reinforced polypropylene Woofer with a Crossover frequency at 2500Hz. On the other hand, the L100 features a 1" Ring Radiator Tweeter and 1 x 5.25" Polypropylene Woofer with a Crossover frequency at 2900Hz.
Frequency Response
S20 has a frequency range of 39-40k Hz whereas L100 has a frequency range of 57-38k Hz. With a minimum frequency of 39Hz, the S20 can go significantly deeper on the low side and provide stronger bass compared to the L100's min frequency of 57Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
S20 is a 8 ohms speaker compared to the L100 which has a nominal impedance of 4 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the L100 can provide this impedance level.
These two speakers also have different sensitivity levels. S20 sensitivity is rated at 88 dB and the L100's is rated at 85.5 dB. This 2 dB difference makes the Polk S20 a more sensitive speaker compared to Polk L100, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using
an amplifier within this range ensures the nominal performance , inputting a power that is higher than the
max wattage can result in a damaged speaker.
S20 can handle a max power of 160 watts RMS from the amp the whereas S20 has a max power handling value of 125 watts RMS , 35 watts less than the L100.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
S20 features Post type posts and L100 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
Polk L100's Post terminals
Cabinet Type and Port Position
Both S20 and L100 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
Polk L100 Enhanced Power Port Port
Physical Specs
Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Polk S20's and Polk L100's external dimensions. Polk S20 has external dimensions of 376.0 x 216.0 x 350.0mm ( 14.8 x 8.5 x 13.7inch) whereas Polk L100 has external dimensions of 348.0 x 201.0 x 288.0mm ( 13-11/16 x 7-7/8 x 11-5/16inch) .
Polk S20 is clearly the larger of the two speakers. Its body is 15mm wider, 28mm taller and 62mm deeper than Polk L100.
Below you can see the front view size comparison of Polk S20 and Polk L100 in scale.
Comparison image of Polk S20 and Polk L100 Size and External Dimensions
Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base surface area of the Polk S20 is approximately 756.0cm2 / 117.2inch2 and base area of the Polk L100 is approximately 578.9cm2 / 89.7inch2. The S20 requires 31% more surface area than the L100 which gives it a small disadvantage on placement in tight spaces.
Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:
Size Comparison image of Polk S20 and Polk L100 on a Media Console
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The Polk S20 weighs 7.73kg / 17lbs and the Polk L100 weighs 7.68kg / 16.9lbs. This makes the S20 1% heavier than the L100.
Here is a comparison of how S20 and L100's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of Polk S20?
Here are the items that are included inside the box of S20:
2 Bookshelf loudspeakers2 Grilles (attached)8 Self-adhesive rubber feetOwners ManualOnline Product Registration
What's in the Box of Polk L100?
Here are the items that come with the L100:
2 Bookshelf loudspeakers 2 Grilles Cleaning cloth Owners Manual Online Registration
 Sensitivity |
88 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
39 Hz
vs
57 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
38k Hz
|
Generates higher frequency |
 Max Input Power |
160 watts
vs
125 watts
|
Handle more power from your amplifier |
 Height |
348mm
vs
376mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
578cm2
vs
756cm2
|
Takes less floor space |
| General |
Polk Audio Signature S20 |
Polk Audio Legend L100 |
| Brand |
Polk Audio |
Polk Audio |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
20-125 watts |
30-160 watts |
| Sensitivity |
88 dB |
85.5 dB |
| Impedance |
8 ohms |
4 ohms |
| Impedance |
n/a |
3 ohms |
| Frequency Response |
39-40k Hz |
57-38k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
5.25" |
| Woofer Composition |
Mica-reinforced polypropylene |
Polypropylene |
| Woofer Surround Material |
Butyl rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Soft-Dome |
Ring Radiator |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2500Hz |
2900Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
376.0mm (14.8") |
348.0mm (13.7") |
| Width |
216.0mm (8.5") |
201.0mm (7.9") |
| Depth |
350.0mm (13.8") |
288.0mm (11.3") |
| Weight |
7.73kg (17lbs) |
7.68kg (16.9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Meddite MDF |
MDF/Wood veneer |
| Available Colors |
Black, Walnut, Brown Walnut |
Brown Walnut, Black Ash |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
24-28" |
24-28" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |