In this review, we will be comparing LSX II LT and The Sevens, two Powered Bookshelf speakers from KEF and Klipsch. 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 LT and Klipsch The Sevens first before getting into our more
detailed comparison.
| Key Specs | KEF LSX II LT | Klipsch The Sevens |
|---|
| Brand | KEF
United Kingdom · founded 1961 | Klipsch
United States · founded 1946 |
|---|
| Design | 2-way | 2-way |
|---|
| Built-in amplifier | 200-watt RMS | 200-watt RMS (400-watt peak) |
|---|
| Uni-Q driver | 11th Generation Uni-Q | — |
|---|
| Tweeter | 0.75" Hard-Dome | 1" Tractrix Horn |
|---|
| Woofer | 4.5" Magnesium/Aluminium alloy | 6.5" Fiber-composite |
|---|
| Frequency response | 54-28k Hz | 39-25k Hz |
|---|
| Max depth / sample rate | 24-bit / 384 kHz | 24-bit / 192 kHz |
|---|
| Bluetooth | Built-in 5.0 | Built-in 5.0 |
|---|
| App control | Yes | Yes |
|---|
| Weight | 3.60kg / 7.9lbs | 9.03kg / 19.9lbs |
|---|
| Dimensions (H x W x D) | 9.5" x 6.1" x 7.1"
240 × 155 × 180 mm | 16.375" x 8.125" x 13.1875"
416.0 x 207.0 x 335.0mm |
|---|
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
Drivers
Both LSX II LT and The Sevens are 2-way speakers.
KEF LSX II LTKlipsch The Sevens
TweeterWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KEF LSX II LT |
Klipsch The Sevens |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
0.75-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4.5-inch
|
1 x 6.5-inch
|
LSX II LT features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer. On the other hand, The Sevens features a 1" Titanium Tractrix Horn Tweeter and 1 x 6.5" Fiber-composite Woofer.
Frequency Response
LSX II LT has a frequency range of 54-28k Hz whereas The Sevens has a frequency range of 39-25k Hz. With a minimum frequency of 39Hz, The Sevens can go significantly deeper on the low side and provide stronger bass compared to the LSX II LT's min frequency of 54Hz.
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.
Cabinet Type and Port Position
Both LSX II LT and The Sevens 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 KEF LSX II LT's and Klipsch The Sevens's external dimensions. KEF LSX II LT has external dimensions of 240 × 155 × 180 mm (9.5 × 6.1 × 7.1 inch) whereas Klipsch The Sevens has external dimensions of 416.0 x 207.0 x 335.0mm (16.375inch x 8.125inch x 13.1875inch).
Klipsch The Sevens is clearly the larger of the two speakers. Its body is 52mm wider, 176mm taller and 155mm deeper than KEF LSX II LT.
Below you can see the front view size comparison of KEF LSX II LT and Klipsch The Sevens in scale.
Comparison image of KEF LSX II LT and Klipsch The Sevens 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 LT is approximately 279.0cm2 / 43.2inch2 and base area of the Klipsch The Sevens is approximately 693.5cm2 / 107.5inch2. The LSX II LT requires 60% less surface area than The Sevens 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 KEF LSX II LT and Klipsch The Sevens 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 LT weighs 3.60kg / 7.9lbs and the Klipsch The Sevens weighs 9.03kg / 19.9lbs. This makes The Sevens 151% heavier than the LSX II LT.
Here is a comparison of how LSX II LT and The Sevens'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 LT?
Here are the items that are included inside the box of LSX II LT:
- 2 Wireless powered speakers
- 6.5-feet AC power cords
- 3m - 10ft Interspeaker cable
- Remote control
- 2 AAA batteries
- Quick Start Guide
- Important Safety Information
- Warranty Information
- Maintenance Guide
What's in the Box of Klipsch The Sevens?
Here are the items that come with The Sevens:
- Powered speaker (Primary)
- Passive speaker (Secondary)
- 2 Grilles (pre-installed)
- 6.5-feet AC power cord
- 13-feet Proprietary speaker cable
- 6.5-feet Proprietary extension cable
- 58-inch HDMI cable
- 5-feet USB-B to USB-A cable
- Remote control
- 2 AAA batteries
- Instruction Booklet
- Need Help? Card
 High Frequency Response |
28k Hz
vs
25k Hz
|
Generates higher frequency |
 Height |
240mm
vs
416mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
279cm2
vs
693cm2
|
Takes less floor space |
 Price per pair* |
999USD
vs
1299USD
|
costs less (*prices may change depending on the seller, location and time) |
 Ethernet Connection |
Yes
vs
No
|
High quality streaming over Ethernet |
 USB Port |
USB-C (connects to your computer)
vs
No
|
USB port adds flexibility |
 Woofer Size |
6.5 inches
vs
4.5 inches
|
Larger woofer |
|
Low Frequency Response |
39 Hz
vs
54 Hz
|
Generates deeper bass |
 3.5mm Connection |
Yes
vs
No
|
Connection via 3.5mm AUX input |
 Phono Input |
Yes
vs
No
|
Connect your turntable directly |
| General |
KEF LSX II LT |
Klipsch The Sevens |
| Brand |
KEF |
Klipsch |
| Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
| Frequency Response |
54-28k Hz |
39-25k Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
200-watt RMS |
| Watts Peak (Max) |
n/a |
400-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" |
6.5" |
| Woofer Composition |
Magnesium/Aluminium alloy |
Fiber-composite |
| Woofer Surround Material |
Rubber |
n/a |
| Tweeter Size |
0.75" |
1" |
| Tweeter Type |
Hard-Dome |
Tractrix Horn |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
240.0mm (9.4") |
416.0mm (16.4") |
| Width |
155.0mm (6.1") |
207.0mm (8.1") |
| Depth |
180.0mm (7.1") |
335.0mm (13.2") |
| Weight |
3.60kg (7.9lbs) |
9.03kg (19.9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
n/a |
MDF with genuine wood veneer |
| Available Colors |
Sage Green, Graphite Grey, Stone White |
Black,Walnut |
| Mounting Bracket |
No |
No |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Aux Inputs |
n/a |
3.5mm |
| USB Port |
USB-C (connects to your computer) |
USB-B |
| Phone Input |
No |
Yes |
| Subwoofer Output |
Wired |
mono-RCA |
| Digital Input |
Optical |
Optical, HDMI |
| HDMI Input |
ARC |
ARC |
| Headphone Jack |
No |
No |
| Ethernet Port |
Yes |
No |
Other |
|
|
| Parts Warranty |
1 Year |
1 Year |
| Labor Warranty |
1 Year |
1 Year |
No single best speaker here - they are built to different priorities, and the right one depends on your room, your sources and what you listen to.
| Area | Better | Why |
|---|
| Bass | B | Klipsch The Sevens digs deeper - 39Hz against 54Hz. |
| Built-in power | evenly matched | Similar onboard amplification (200W vs 200W RMS). |
| Connections | A | KEF LSX II LT adds Wi-Fi and streaming; Klipsch The Sevens adds phono. |
| Size | depends | KEF LSX II LT is easier to place; Klipsch The Sevens is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | depends | KEF LSX II LT: a sub output; Klipsch The Sevens: a sub output. KEF LSX II LT sits in a wider range (10 models), so a matched surround system is easier later. |
| Price | A | KEF LSX II LT is cheaper - $999 against $1,299, about 23% less. |
A KEF LSX II LT B Klipsch The Sevens
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and your own room settle it. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 54Hz anyway, which makes the cheaper KEF LSX II LT much easier to justify. In a large or open-plan room, Klipsch The Sevens has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, KEF LSX II LT is the easier speaker to get right.
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.