In this review, we will be comparing LS50 and L100 Classic, two Passive Bookshelf speakers from KEF and JBL. Let's have a brief look at the main features
of KEF LS50 and JBL L100 Classic first before getting into our more
detailed comparison.
KEF LS50 Key Specs
- 2-way Design
- 11th Generation Uni-Q Driver
- 1" Vented dome Tweeter
- 5.25" Magnesium/aluminum alloy Woofer
- 79-28k Hz Frequency Response
- 85 dB Sensitivity
- Impedance: 8ohms
- Power Range:25-100watts
- Weight:7.20kg
- Dimensions (H x W x D): 302.0" x 7.8" x 10.9"( 302.0 x 200.0 x 278.0mm )
JBL L100 Classic Key Specs
- 3-way Design
- 1" Dome Tweeter
- 5.25" Midrange
- 12" Pulp Woofer
- 5.25" Midrange
- 40-40k Hz Frequency Response
- 90 dB Sensitivity
- Impedance: 4ohms
- Power Range:25-200watts
- Weight:26.70kg
- Dimensions (H x W x D): 636.5" x 15.3" x 14.6"( 636.5 x 389.6 x 371.5mm )
What size room are the KEF LS50 and JBL L100 Classic 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* |
KEF LS50 |
JBL L100 Classic |
| Near-field |
Average |
Poor |
| Small Room |
Good |
Average |
| Mid-size Room |
Average |
Good |
| Large Room |
Poor |
Average |
| Very Large Room |
Bad |
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.)
In the following sections, we will get into more detail in order to better understand how the KEF LS50 and JBL L100 Classic compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
One of the fundamental differences between these two speakers is that LS50 is a 2-way design whereas the L100 Classic is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
KEF LS50 |
JBL L100 Classic |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
1 x 5.25-inch |
|
Woofer
|
1 x 5.25-inch
|
1 x 12-inch
|
LS50 features a 1" Aluminum Vented dome Tweeter and 1 x 5.25" Magnesium/aluminum alloy Woofer with a Crossover frequency at 2200Hz. On the other hand, the L100 Classic features a 1" Titanium Dome Tweeter , a 5.25" Midrange and 1 x 12" Pulp Woofer with a Crossover frequency at 450Hz and 3500Hz.
Frequency Response
LS50 has a frequency range of 79-28k Hz whereas L100 Classic has a frequency range of 40-40k Hz. With a minimum frequency of 40Hz, the L100 Classic can go significantly deeper on the low side and provide stronger bass compared to the LS50's min frequency of 79Hz.
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
LS50 is a 8 ohms speaker compared to the L100 Classic which has a nominal impedance of 4 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the L100 Classic can provide this impedance level.
These two speakers also have different sensitivity levels. LS50 sensitivity is rated at 85 dB and the L100 Classic's is rated at 90 dB. This 5 dB difference makes the JBL L100 Classic a more sensitive speaker compared to KEF LS50, 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.
LS50 can handle a max power of 200 watts RMS from the amp the whereas LS50 has a max power handling value of 100 watts RMS , 100 watts less than the L100 Classic.
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
LS50 features Five-way gold-plated binding posts type posts and L100 Classic has a Five-way gold-plated binding posts type posts. None of these speakers feature bi-amping/bi-wiring.
KEF LS50's Post terminals
JBL L100 Classic's Five-way gold-plated binding posts terminals
Cabinet Type and Port Position
LS50 has a rear firing port whereas L100 Classic has a front firing ports. JBL L100 Classic's front-firing port gives more flexibility in placement in regards to proximity to walls compared to KEF LS50 with its rear-firing 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 LS50's and JBL L100 Classic's external dimensions. KEF LS50 has external dimensions of 302.0 x 200.0 x 278.0mm ( 11.8 x 7.8 x 10.9inch) whereas JBL L100 Classic has external dimensions of 636.5 x 389.6 x 371.5mm ( 25.0 x 15.3 x 14.6inch) .
JBL L100 Classic is clearly the larger of the two speakers. Its body is 189.6mm wider, 334.5mm taller and 93.5mm deeper than KEF LS50.
Below you can see the front view size comparison of KEF LS50 and JBL L100 Classic in scale.
Comparison image of KEF LS50 and JBL L100 Classic 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 LS50 is approximately 556.0cm2 / 86.2inch2 and base area of the JBL L100 Classic is approximately 1447.4cm2 / 224.3inch2. The LS50 requires 62% less surface area than the L100 Classic which gives it a small advantage 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 KEF LS50 weighs 7.20kg / 15.8lbs and the JBL L100 Classic weighs 26.70kg / 58.7lbs. This makes the L100 Classic 271% heavier than the LS50.
Here is a comparison of how LS50 and L100 Classic's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of KEF LS50?
Here are the items that are included inside the box of LS50:
2 Bookshelf loudspeakers 2 Foam port plugs 8 Self-adhesive rubber feet Owner's Manual Warranty Registration Card
What's in the Box of JBL L100 Classic?
Here are the items that come with the L100 Classic:
Bookshelf loudspeaker
Grille
Owner's Manual