In this review, we will be comparing ES20 and Demand D9, two Passive Bookshelf speakers from Polk Audio and Definitive Technology. Let's have a brief look at the main features
of Polk ES20 and Definitive Demand D9 first before getting into our more
detailed comparison.
What size room are the Polk ES20 and Definitive Demand D9 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:
In the following sections, we will get into more detail in order to better understand how the Polk ES20 and Definitive Demand D9 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
Both ES20 and Demand D9 are 2-way speakers.
| Driver |
Polk ES20 |
Definitive Demand D9 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 5.25-inch
|
ES20 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 Demand D9 features a 1" Hard-Dome Tweeter and 1 x 5.25" Polypropylene Woofer .
Frequency Response
ES20 has a frequency range of 41-40k Hz whereas Demand D9 has a frequency range of 64-22k Hz. With a minimum frequency of 41Hz, the ES20 can go significantly deeper on the low side and provide stronger bass compared to the Demand D9's min frequency of 64Hz.
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
ES20 and Demand D9 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. ES20 sensitivity is rated at 86 dB and the Demand D9's is at 88 dB. This 2 dB difference makes the Definitive Demand D9 a more sensitive speaker compared to Polk ES20, 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.
ES20 can handle a max power of 150 watts RMS from the amp the whereas ES20 has a max power handling value of 125 watts RMS , 25 watts less than the Demand D9.
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
Demand D9 features 5-Way post posts which make bi-amping or bi-wiring possible. ES20 has a 5-Way post which doesn't feature bi-amping/bi-wiring.
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 ES20's and Definitive Demand D9's external dimensions. Polk ES20 has external dimensions of 375.0 x 218.0 x 351.0mm ( 14-3/4 x 8-9/16 x 13-13/16inch) whereas Definitive Demand D9 has external dimensions of 301.0 x 167.0 x 316.0mm ( 11-13/16 x 6-9/16 x 12-7/16inch) .
Polk ES20 is clearly the larger of the two speakers. Its body is 51mm wider, 74mm taller and 35mm deeper than Definitive Demand D9.
Below you can see the front view size comparison of Polk ES20 and Definitive Demand D9 in scale.
Comparison image of Polk ES20 and Definitive Demand D9 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 ES20 is approximately 765.2cm2 / 118.6inch2 and base area of the Definitive Demand D9 is approximately 527.7cm2 / 81.8inch2. The ES20 requires 45% more surface area than the Demand D9 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 ES20 and Definitive Demand D9 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 ES20 weighs 7.73kg / 17lbs and the Definitive Demand D9 weighs 7.73kg / 17lbs.
Here is a comparison of how ES20 and Demand D9'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 ES20?
Here are the items that are included inside the box of ES20:
2 Bookshelf loudspeakers2 Grille (attached)8 Self-adhesive rubber feetOwners ManualOnline Product Registration
What's in the Box of Definitive Demand D9?
Here are the items that come with the Demand D9:
Left bookshelf loudpseakerRight bookshelf loudspeaker2 Grilles4 Jumper-straps (pre-installed)Cleaning clothOwners Manual
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
| Low Frequency Response |
41 Hz
vs
64 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
22k Hz
|
Generates higher frequency |
 Price per pair* |
399USD
vs
749USD
|
costs less (*prices may change depending on the seller, location and time) |
 Max Input Power |
150 watts
vs
125 watts
|
Handle more power from your amplifier |
 Sensitivity |
88 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Height |
301mm
vs
375mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
527cm2 (167x316mm)
vs
765cm2 (218x351mm)
|
Takes less floor space |
| General |
Polk Audio Signature Elite ES20 |
Definitive Technology Demand Series D9 |
| Brand |
Polk Audio |
Definitive Technology |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
20-125 watts |
20-150 watts |
| Sensitivity |
86 dB |
88 dB |
| Impedance |
8 ohms |
8 ohms |
| Frequency Response |
41-40k Hz |
64-22k 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 |
Hard-Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2500Hz |
n/a |
| Firing Direction |
rear |
n/a |
Physical Specs |
|
|
| Height |
375.0mm (14.8") |
301.0mm (11.9") |
| Width |
218.0mm (8.6") |
167.0mm (6.6") |
| Depth |
351.0mm (13.8") |
316.0mm (12.4") |
| Weight |
7.73kg (17lbs) |
7.73kg (17lbs) |
| Enclosure |
Bass Reflex |
Passive Radiator |
| Finish |
MDF, Wood-grain vinyl |
MDF/Aluminum |
| Available Colors |
Black,White,Walnut |
Gloss White,Piano Black |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
22-26" |
24-28" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |