In this review, we will be comparing 3030i and S20, two Passive Bookshelf speakers from Q Acoustics and Polk Audio.
Let's have a brief look at the main features
of Q Acoustics 3030i and Polk S20 first before getting into our more
detailed comparison.
| Key Specs | Q Acoustics 3030i | Polk S20 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1" decoupled | 1" Soft-Dome |
|---|
| Woofer | 6.5" Coated paper | 6.5" Mica-reinforced polypropylene |
|---|
| Frequency response | 46-30k Hz | 39-40k Hz |
|---|
| Sensitivity | 88 dB | 88 dB |
|---|
| Impedance | 6 ohms | 8 ohms |
|---|
| Power range | 25-75 watts | 20-125 watts |
|---|
| Weight | 6.20kg / 13.6lbs | 7.73kg / 17lbs |
|---|
| Dimensions (H x W x D) | 12.7" x 7.8" x 12.9"
325.0 x 200.0 x 329.0mm | 14.8" x 8.5" x 13.7"
376.0 x 216.0 x 350.0mm |
|---|
What size room are the Q Acoustics 3030i and Polk S20 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* |
Q Acoustics 3030i |
Polk S20 |
| Near-field |
Good |
Poor |
| Small Room |
Good |
Average |
| Mid-size Room |
Average |
Good |
| Large Room |
Poor |
Average |
| Very Large Room |
No way |
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.)
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
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Drivers
Both 3030i and S20 are 2-way speakers.
Q Acoustics 3030iPolk S20
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
Q Acoustics 3030i |
Polk S20 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 6.5-inch
|
3030i features a 1" decoupled Tweeter and 1 x 6.5" Coated paper Woofer with a Crossover frequency at 2400Hz. On the other hand, the S20 features a 1" Terylene Soft-Dome Tweeter and 1 x 6.5" Mica-reinforced polypropylene Woofer with a Crossover frequency at 2500Hz.
Frequency Response
3030i has a frequency range of 46-30k Hz whereas S20 has a frequency range of 39-40k Hz. With a minimum frequency of 39Hz, the S20 can go significantly deeper on the low side and provide stronger bass compared to the 3030i's min frequency of 46Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
3030i is a 6 ohms speaker compared to the S20 which has a nominal impedance of 8 ohms.
On the other hand, they have the same sensitivity of 88 dBdB.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
S20 can handle a max power of 125 watts RMS, whereas 3030i has a max power handling value of 75 watts RMS, 50 watts less than the S20.
Note that higher power handling does not make a speaker louder: that depends mainly on
sensitivity and impedance. The calculator below shows how loud each of these actually plays
on a real amplifier.
Which plays louder on your amplifier?
Starting with a popular amplifier — change it to the one you own, or any you are
considering, and watch both numbers move.
Input Type and Bi-Amping / Bi-Wiring
3030i features 5-way post type posts and S20 has a 5-way post type posts. None of these speakers feature bi-amping/bi-wiring.
Cabinet Type and Port Position
Both 3030i and S20 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.
Physical Specs
The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Q Acoustics 3030i's and Polk S20's external dimensions. Q Acoustics 3030i has external dimensions of 325.0 x 200.0 x 329.0mm (12.7 x 7.8 x 12.9inch) whereas Polk S20 has external dimensions of 376.0 x 216.0 x 350.0mm (14.8 x 8.5 x 13.7inch).
Polk S20 is clearly the larger of the two speakers. Its body is 16mm wider, 51mm taller and 21mm deeper than Q Acoustics 3030i.
Below you can see the front view size comparison of Q Acoustics 3030i and Polk S20 in scale.
Comparison image of Q Acoustics 3030i and Polk S20 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 Q Acoustics 3030i is approximately 658.0cm2 / 102.0inch2 and base area of the Polk S20 is approximately 756.0cm2 / 117.2inch2. The 3030i requires 13% less surface area than the S20 which gives it a small advantage on placement in tight spaces.
Here is 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 Q Acoustics 3030i and Polk S20 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 Q Acoustics 3030i weighs 6.20kg / 13.6lbs and the Polk S20 weighs 7.73kg / 17lbs. This makes the S20 25% heavier than the 3030i.
Here is a comparison of how 3030i and S20's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of Q Acoustics 3030i?
Here are the items that are included inside the box of 3030i:
- 2 x 3030i bookshelf speakers
- 2 x Speaker Grilles
- 2 x Foam Bungs
- 1 x User Manual
What's in the Box of Polk S20?
Here are the items that come with the S20:
- 2 Bookshelf loudspeakers
- 2 Grilles (attached)
- 8 Self-adhesive rubber feet
- Owners Manual
- Online Product Registration
 Height |
325mm
vs
376mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
658cm2
vs
756cm2
|
Takes less floor space |
 Max Input Power |
125 watts
vs
75 watts
|
Handle more power from your amplifier |
 Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
 Low Frequency Response |
39 Hz
vs
46 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
30k Hz
|
Generates higher frequency |
| General |
Q Acoustics 3030i |
Polk Audio Signature S20 |
| Brand |
Q Acoustics |
Polk Audio |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
25-75 watts |
20-125 watts |
| Sensitivity |
88 dB |
88 dB |
| Impedance |
6 ohms |
8 ohms |
| Impedance |
4 ohms |
n/a |
| Frequency Response |
46-30k Hz |
39-40k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
6.5" |
| Woofer Composition |
Coated paper |
Mica-reinforced polypropylene |
| Woofer Surround Material |
Rubber |
Butyl rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
decoupled |
Soft-Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2400Hz |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
325.0mm (12.8") |
376.0mm (14.8") |
| Width |
200.0mm (7.9") |
216.0mm (8.5") |
| Depth |
329.0mm (13") |
350.0mm (13.8") |
| Weight |
6.20kg (13.6lbs) |
7.73kg (17lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
n/a |
Meddite MDF |
| Available Colors |
Walnut, Black, White |
Black, Walnut, Brown Walnut |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
n/a |
24-28" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
4 Years |
5 Years |
| Labor Warranty |
4 Years |
5 Years |
A generation apart: Q Acoustics 3030i is the newer design, against a 2016 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass |
B |
Polk S20 digs deeper - 39Hz against 46Hz. A subwoofer would even that out. |
| Amplifier needs |
evenly matched |
Similar sensitivity (88dB vs 88dB) - both want much the same power. |
| Amplifier match |
B |
Polk S20 is the easier load at 8 ohms. |
| Headroom |
B |
Polk S20 takes more power (125W vs 75W) - more in hand in a big room. |
| Size |
depends |
Q Acoustics 3030i is easier to place; Polk S20 is bigger, which usually goes with fuller bass. Your room decides. |
A Q Acoustics 3030i
B Polk S20
depends neither is better in the abstract - it turns on your room, placement or how you will use them.
Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Polk S20 has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 46Hz anyway, so judge these on the other rows instead. Match it to your room: we rate Q Acoustics 3030i the better fit for near-field listening and a small room, and Polk S20 for a mid-size room and a large room.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.