In this review, we will be comparing LSX II and Prime Wireless, two Powered Bookshelf speakers from KEF and SVS. Being Powered speakers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features
of KEF LSX II and SVS Prime Wireless first before getting into our more
detailed comparison.
In the following sections, we will get into more detail in order to better understand how the KEF LSX II and SVS Prime Wireless 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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Drivers
Both LSX II and Prime Wireless are 2-way speakers.
| Driver |
KEF LSX II |
SVS Prime Wireless |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
0.75-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4.5-inch
|
1 x 4.5-inch
|
LSX II features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer . On the other hand, the Prime Wireless features a 1" aluminum Dome Tweeter and 1 x 4.5" composite glass-fiber Woofer with a Crossover frequency at 2000Hz.
Frequency Response
LSX II has a frequency range of 54-28k Hz whereas Prime Wireless has a frequency range of 52-25k Hz. With a minimum frequency of 52Hz, the Prime Wireless can go slightly deeper then the LSX II's min frequency of 54Hz.
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.
Cabinet Type and Port Position
Both LSX II and Prime Wireless 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.
KEF LSX II 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 KEF LSX II's and SVS Prime Wireless's external dimensions. KEF LSX II has external dimensions of 240 × 155 × 180 mm ( 9.5 × 6.1 × 7.1 inch) whereas SVS Prime Wireless has external dimensions of 260.0 x 155.0 x 160.0mm ( 10.3125 x 6.125 x 8.6875inch) .
Below you can see the front view size comparison of KEF LSX II and SVS Prime Wireless in scale.
Comparison image of KEF LSX II and SVS Prime Wireless 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 KEF LSX II is approximately 279.0cm2 / 43.2inch2 and base area of the SVS Prime Wireless is approximately 248.0cm2 / 38.4inch2. The LSX II requires 13% more surface area than the Prime Wireless 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 KEF LSX II and SVS Prime Wireless 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 KEF LSX II weighs 3.60kg / 7.9lbs and the SVS Prime Wireless weighs 3.96kg / 8.7lbs. This makes the Prime Wireless 10% heavier than the LSX II.
Here is a comparison of how LSX II and Prime Wireless's weights compare with the average, max and min weights in Powered Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of KEF LSX II?
Here are the items that are included inside the box of LSX II:
2 Wireless powered speakersTwo 6.5-feet AC power cords10-feet Cat-6 interconnect speaker cableRemote control2 AAA batteries Quick Start Guide Important Safety Information Warranty Information Maintenance Guide
What's in the Box of SVS Prime Wireless?
Here are the items that come with the Prime Wireless:
Active wireless speaker6-feet AC power cordGrille (pre-installed)4 Self-adhesive feetQuick Start GuideWarranty/Registration CardSVS brochure
 High Frequency Response |
28k Hz
vs
25k Hz
|
Generates higher frequency |
 Handheld Remote |
Yes
vs
No
|
Control the speaker by the included RC |
 Height |
240mm
vs
260mm
|
Easier to fit in smaller spaces |
 HDMI Input |
ARC
vs
No
|
Connect HDMI sources directly |
 Low Frequency Response |
52 Hz
vs
54 Hz
|
Generates deeper bass |
 Base Surface Area |
248cm2 (155x160mm)
vs
279cm2 (155x180mm)
|
Takes less floor space |
 Price per pair* |
500USD
vs
1299USD
|
costs less (*prices may change depending on the seller, location and time) |
 RCA Connection |
Yes
vs
No
|
Connection via RCA input |
| General |
KEF LSX II |
SVS Prime Wireless |
| Brand |
KEF |
SVS |
| Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
| Frequency Response |
54-28k Hz |
52-25k Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
200-watt RMS |
| Max Bit Depth |
24-bit |
24-bit |
| Max Sample Rate |
384 kHz |
192 kHz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
4.5" |
4.5" |
| Woofer Composition |
Magnesium/Aluminium alloy |
composite glass-fiber |
| Woofer Surround Material |
Rubber |
n/a |
| Tweeter Size |
0.75" |
1" |
| Tweeter Type |
Hard-Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2000Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
240.0mm (9.4") |
260.0mm (10.2") |
| Width |
155.0mm (6.1") |
155.0mm (6.1") |
| Depth |
180.0mm (7.1") |
160.0mm (6.3") |
| Weight |
3.60kg (7.9lbs) |
3.96kg (8.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Available Colors |
Carbon Black, Mineral White, Cobalt Blue, Lava Red, and Soundwave |
Black |
| Mounting Bracket |
No |
No |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Aux Inputs |
3.5mm |
3.5mm, RCA |
| USB Port |
USB-C (connects to your computer) |
Service only |
| Phone Input |
No |
No |
| Subwoofer Output |
Wired |
Wired |
| Digital Input |
Optical |
Optical |
| HDMI Input |
ARC |
No |
| Headphone Jack |
No |
No |
| Ethernet Port |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
1 Year |
2 Years |
| Labor Warranty |
1 Year |
2 Years |