In this review, we will be comparing Prime Bookshelf and S15, two Passive Bookshelf speakers from SVS and Polk Audio.
Let's have a brief look at the main features
of SVS Prime Bookshelf and Polk S15 first before getting into our more
detailed comparison.
| Key Specs | SVS Prime Bookshelf | Polk S15 |
|---|
| Brand | SVS
United States · founded 1998 | Polk Audio
United States · founded 1972 |
|---|
| Design | 2-way | 2-way |
|---|
| Tweeter | 1" Hard-Dome | 1" Dome |
|---|
| Woofer | 6.5" | 5.25" Mica-reinforced polypropylene |
|---|
| Frequency response | 48-25k Hz | 50-40k Hz |
|---|
| Sensitivity | 87 dB | 88 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 25-150 watts | 20-100 watts |
|---|
| Weight | 7.03kg / 15.5lbs | 5.90kg / 13lbs |
|---|
| Dimensions (H x W x D) | 13.2" x 8.0" x 10.2"
337.8 x 203.2 x 261.6mm | 12.0" x 7.4" x 10.2"
304.8 x 190.0 x 260.4mm |
|---|
What size room are the SVS Prime Bookshelf and Polk S15 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* |
SVS Prime Bookshelf |
Polk S15 |
| Near-field |
Poor |
Average |
| Small Room |
Average |
Good |
| Mid-size Room |
Good |
Average |
| Large Room |
Average |
Poor |
| Very Large Room |
Poor |
Bad |
(* 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.
Drivers
Both Prime Bookshelf and S15 are 2-way speakers.
SVS Prime BookshelfPolk S15
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
SVS Prime Bookshelf |
Polk S15 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 5.25-inch
|
Prime Bookshelf features a 1" aluminum Hard-Dome Tweeter and 1 x 6.5" Woofer with a Crossover frequency at 2300Hz. On the other hand, the S15 features a 1" Terylene Dome Tweeter and 1 x 5.25" Mica-reinforced polypropylene Woofer with a Crossover frequency at 2500Hz.
Frequency Response
Prime Bookshelf has a frequency range of 48-25k Hz whereas S15 has a frequency range of 50-40k Hz. With a minimum frequency of 48Hz, the Prime Bookshelf can go slightly deeper then the S15's min frequency of 50Hz.
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
Prime Bookshelf and S15 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Prime Bookshelf sensitivity is rated at 87 dB and the S15's is at 88 dB. This 1 dB difference makes the Polk S15 a more sensitive speaker compared to SVS Prime Bookshelf, 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. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Prime Bookshelf can handle a max power of 150 watts RMS, whereas S15 has a max power handling value of 100 watts RMS, 50 watts less than the Prime Bookshelf.
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
Prime Bookshelf features Pair of Binding Posts - Gold Plated type posts and S15 has a Pair of Binding Posts - Gold Plated type posts. None of these speakers feature bi-amping/bi-wiring.
SVS Prime Bookshelf's 5-way post terminals
Cabinet Type and Port Position
Both Prime Bookshelf and S15 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 SVS Prime Bookshelf's and Polk S15's external dimensions. SVS Prime Bookshelf has external dimensions of 337.8 x 203.2 x 261.6mm (13.2 x 8.0 x 10.2inch) whereas Polk S15 has external dimensions of 304.8 x 190.0 x 260.4mm (12.0 x 7.4 x 10.2inch).
SVS Prime Bookshelf is clearly the larger of the two speakers. Its body is 13.2mm wider, 33mm taller and 1.2mm deeper than Polk S15.
Size, drawn to scale
Both speakers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same surface and pushed back to the same wall, so the deeper one visibly sticks out further.
Near-identical footprints. SVS Prime Bookshelf is 33mm taller.
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 SVS Prime Bookshelf is approximately 531.6cm2 / 82.4inch2 and base area of the Polk S15 is approximately 494.8cm2 / 76.7inch2. The Prime Bookshelf requires 7% more surface area than the S15 which gives it a small disadvantage on placement in tight spaces.
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 SVS Prime Bookshelf weighs 7.03kg / 15.5lbs and the Polk S15 weighs 5.90kg / 13lbs. This makes the Prime Bookshelf 19% heavier than the S15.
Here is a comparison of how Prime Bookshelf and S15's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of SVS Prime Bookshelf?
Here are the items that are included inside the box of Prime Bookshelf:
- 2 Bookshelf loudspeakers
- 2 Grilles (pre-installed)
- 8 Self-adhesive rubber bumpers
- Owners Manual SVS brochure
- Online Product Registration Card
What's in the Box of Polk S15?
Here are the items that come with the S15:
- 2 Bookshelf loudspeakers
- 2 Grille (attached)
- 8 Self-adhesive rubber feet
- Wall-mount template
- Owners Manual
- Online Product Registration
 Max Input Power |
150 watts
vs
100 watts
|
Handle more power from your amplifier |
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
48 Hz
vs
50 Hz
|
Generates deeper bass |
 Sensitivity |
88 dB
vs
87 dB
|
Play louder with same amount of amplification power |
 High Frequency Response |
40k Hz
vs
25k Hz
|
Generates higher frequency |
 Mounting Bracket |
Yes
vs
No
|
Allows mounting on walls |
 Height |
304mm
vs
337mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
494cm2
vs
531cm2
|
Takes less floor space |
 Price per pair* |
259USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
SVS Prime Bookshelf |
Polk Audio Signature S15 |
| Brand |
SVS |
Polk Audio |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
25-150 watts |
20-100 watts |
| Sensitivity |
87 dB |
88 dB |
| Impedance |
8 ohms |
8 ohms |
| Frequency Response |
48-25k Hz |
50-40k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
5.25" |
| Woofer Composition |
|
Mica-reinforced polypropylene |
| Woofer Surround Material |
Polypropylene |
Butyl rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Hard-Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2300Hz |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
337.8mm (13.3") |
304.8mm (12") |
| Width |
203.2mm (8") |
190.0mm (7.5") |
| Depth |
261.6mm (10.3") |
260.4mm (10.3") |
| Weight |
7.03kg (15.5lbs) |
5.90kg (13lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood-grain vinyl |
Meddite MDF |
| Available Colors |
Black Ash,Piano Gloss Black |
Black, Walnut, Brown Walnut |
| Mounting Bracket |
No |
Keyhole |
| Recommended Stand Height |
24-28" |
24-30" |
| 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 |
These sit in different price classes - SVS Prime Bookshelf costs roughly 2.3x what Polk S15 does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | evenly matched | Much the same reach (48Hz vs 50Hz). |
| Amplifier needs | evenly matched | Similar sensitivity (87dB vs 88dB) - both want much the same power. |
| Headroom | A | SVS Prime Bookshelf takes more power (150W vs 100W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Price | B | Polk S15 is cheaper - $259 against $600, about 57% less; arguably a different class. |
A SVS Prime Bookshelf B Polk S15
depends neither is better in the abstract - it turns on your room, your system 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?
SVS Prime Bookshelf is ahead, but only on 1 of the measured areas, and it costs about 132% more. That is a lot of money for a narrow margin on paper - Polk S15 looks like the sensible buy unless something else about the SVS Prime Bookshelf appeals to you. Match it to your room: we rate SVS Prime Bookshelf the better fit for a mid-size room and a large room, and Polk S15 for near-field listening and a small room. Think about the whole system, not just the speakers: the roughly $341 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
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.