In this review, we will be comparing ESL 9 and Kendall, two Passive Floor-standing speakers from MartinLogan and KLH.
Let's have a brief look at the main features
of MartinLogan ESL 9 and KLH Kendall first before getting into our more
detailed comparison.
MartinLogan ESL 9 Key Specs
- 2-way Design
- 9.2 x 44" curved electrostatic transducer Tweeter
- 2 x 8" high-excursion paper cone Woofer
- 34-23k Hz Frequency Response
- 90 dB Sensitivity
- Impedance: 4ohms
- Power Range:20-400watts
- Weight:35.45kg
- Dimensions (H x W x D): 1520.0" x 10-7/16" x 25-7/16"( 1520.0 x 266.0 x 647.0mm )
KLH Kendall Key Specs
- 3-way Design
- 1" Tweeter
- 5.25" Midrange
- 2 x 6.5" Woven Kevlar Woofer
- 5.25" Midrange
- 25-23k Hz Frequency Response
- 96 dB Sensitivity
- Impedance: 8ohms
- Power Range:up to 250watts
- Weight:22.14kg
- Dimensions (H x W x D): 1021.0" x 8-5/16" x 14-15/16"( 1021.0 x 212.0 x 380.0mm )
In the following sections, we will get into more detail in order to better understand how the MartinLogan ESL 9 and KLH Kendall 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
One of the fundamental differences between these two speakers is that ESL 9 is a 2-way design whereas the Kendall 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 |
MartinLogan ESL 9 |
KLH Kendall |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
9.2 x 44-inch
|
1-inch
|
|
Midrange
|
- |
1 x 5.25-inch |
|
Woofer
|
2 x 8-inch
|
2 x 6.5-inch
|
ESL 9 features a 9.2 x 44" curved electrostatic transducer Tweeter and 2 x 8" high-excursion paper cone Woofer . On the other hand, the Kendall features a 1" anodized aluminum Tweeter , a 5.25" Midrange and 2 x 6.5" Woven Kevlar Woofer .
Frequency Response
ESL 9 has a frequency range of 34-23k Hz whereas Kendall has a frequency range of 25-23k Hz. With a minimum frequency of 25Hz, the Kendall can go significantly deeper on the low side and provide stronger bass compared to the ESL 9's min frequency of 34Hz.
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 Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing 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
ESL 9 is a 4 ohms speaker compared to the Kendall which has a nominal impedance of 8 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 ESL 9 can provide this impedance level.
These two speakers also have different sensitivity levels. ESL 9 sensitivity is rated at 90 dB and the Kendall's is rated at 96 dB. This 6 dB difference makes the KLH Kendall a more sensitive speaker compared to MartinLogan ESL 9, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing 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.
ESL 9 can handle a max power of 400 watts RMS from the amp the whereas Kendall has a max power handling value of watts RMS, 400 watts less than the ESL 9.
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
Both ESL 9 and Kendall features dual binding post speaker terminals for bi-amping or bi-wiring.
MartinLogan ESL 9's Binding post terminals allows Bi-amping or bi-wiring
KLH Kendall's Binding post terminals allows Bi-amping or bi-wiring
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 MartinLogan ESL 9's and KLH Kendall's external dimensions. MartinLogan ESL 9 has external dimensions of 1520.0 x 266.0 x 647.0mm ( 59-13/16 x 10-7/16 x 25-7/16inch) whereas KLH Kendall has external dimensions of 1021.0 x 212.0 x 380.0mm ( 40-3/16 x 8-5/16 x 14-15/16inch) .
MartinLogan ESL 9 is clearly the larger of the two speakers. Its body is 54mm wider, 499mm taller and 267mm deeper than KLH Kendall.
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 MartinLogan ESL 9 is approximately 1721.0cm2 / 266.8inch2 and base area of the KLH Kendall is approximately 805.6cm2 / 124.9inch2. The ESL 9 requires 114% more surface area than the Kendall 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 MartinLogan ESL 9 weighs 35.45kg / 78lbs and the KLH Kendall weighs 22.14kg / 48.7lbs. This makes the ESL 9 60% heavier than the Kendall.
Here is a comparison of how ESL 9 and Kendall's weights compare with the average, max and min weights in Passive Floor-standing class.
Weight
All Floor-standing Speakers
What's in the Box of MartinLogan ESL 9?
Here are the items that are included inside the box of ESL 9:
Floorstanding hybrid electrostatic loudspeakerAC power adapter (w/ attached 10-feet DC cord)Grille4 Spike FeetUsers ManualProduct Registration Card
What's in the Box of KLH Kendall?
Here are the items that come with the Kendall:
Floorstanding loudspeakerGrilleFoam port4 Rubber feet4 Spike feet (with nuts)4 Protective discsManual
 Woofer Size |
8 inches
vs
6.5 inches
|
Larger woofer |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Sensitivity |
96 dB
vs
90 dB
|
Play louder with same amount of amplification power |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
|
Low Frequency Response |
25 Hz
vs
34 Hz
|
Generates deeper bass |
 Height |
1021mm
vs
1520mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
805cm2
vs
1721cm2
|
Takes less floor space |
 Price per pair* |
1500USD
vs
7000USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
MartinLogan Masterpiece Classic ESL 9 |
KLH Kendall |
| Brand |
MartinLogan |
KLH |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
20-400 watts |
up to 250 watts |
| Sensitivity |
90 dB |
96 dB |
| Impedance |
4 ohms |
8 ohms |
| Frequency Response |
34-23k Hz |
25-23k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
8" |
6.5" |
| Woofer Composition |
high-excursion paper cone |
Woven Kevlar |
| Woofer Surround Material |
Rubber |
Butyl Rubber |
| Tweeter Size |
9.2 x 44" |
1" |
| Tweeter Type |
curved electrostatic transducer |
n/a |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
5.25" |
Physical Specs |
|
|
| Height |
1520.0mm (59.8") |
1021.0mm (40.2") |
| Width |
266.0mm (10.5") |
212.0mm (8.3") |
| Depth |
647.0mm (25.5") |
380.0mm (15") |
| Weight |
35.45kg (78lbs) |
22.14kg (48.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Composite |
MDF/Wood Veneer |
| Available Colors |
Gloss Black |
Black |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years w/ Registration |
10 Years |
| Labor Warranty |
5 Years w/ Registration |
10 Years |