In this review, we will be comparing Heresy IV and Kendall, two Passive Floor-standing speakers from Klipsch and KLH.
Let's have a brief look at the main features
of Klipsch Heresy IV and KLH Kendall first before getting into our more
detailed comparison.
| Key Specs | Klipsch Heresy IV | KLH Kendall |
|---|
| Brand | Klipsch
United States · founded 1946 | KLH
United States · founded 1957 |
|---|
| Design | 3-way | 3-way |
|---|
| Tweeter | 1" horn-loaded | 1" |
|---|
| Midrange | 1.75" | 5.25" |
|---|
| Woofer | 12" Fiber-composite | 2 x 6.5" Woven Kevlar |
|---|
| Frequency response | 48-20k Hz | 25-23k Hz |
|---|
| Sensitivity | 99 dB | 96 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | up to 100 watts | up to 250 watts |
|---|
| Weight | 20.45kg / 45lbs | 22.14kg / 48.7lbs |
|---|
| Dimensions (H x W x D) | 24-13/16" x 15-1/2" x 13-1/4"
631.0 x 394.0 x 337.0mm | 40-3/16" x 8-5/16" x 14-15/16"
1021.0 x 212.0 x 380.0mm |
|---|
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
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Drivers
Both Heresy IV and Kendall are 3-way speakers.
Klipsch Heresy IVKLH Kendall
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
Klipsch Heresy IV |
KLH Kendall |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 1.75-inch |
1 x 5.25-inch |
|
Woofer
|
1 x 12-inch
|
2 x 6.5-inch
|
Heresy IV features a 1" titanium-diaphragm compression horn-loaded Tweeter, a 1.75" Midrange and 1 x 12" Fiber-composite 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
Heresy IV has a frequency range of 48-20k 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 Heresy IV's min frequency of 48Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing 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
Heresy IV and Kendall have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Heresy IV sensitivity is rated at 99 dB and the Kendall's is at 96 dB. This 3 dB difference makes the Klipsch Heresy IV a more sensitive speaker compared to KLH Kendall, 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. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Kendall can handle a max power of 250 watts RMS, whereas Heresy IV has a max power handling value of 100 watts RMS, 150 watts less than the Kendall.
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
Both Heresy IV and Kendall features dual binding post speaker terminals for bi-amping or bi-wiring.
KLH Kendall's Binding post terminals allows Bi-amping or bi-wiring
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 Klipsch Heresy IV's and KLH Kendall's external dimensions. Klipsch Heresy IV has external dimensions of 631.0 x 394.0 x 337.0mm (24-13/16 x 15-1/2 x 13-1/4inch) 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).
Klipsch Heresy IV is 390mm shorter and 43mm less deeper than KLH Kendall but it is also 182mm wider.
Below you can see the front view size comparison of Klipsch Heresy IV and KLH Kendall in scale.
Comparison image of Klipsch Heresy IV and KLH Kendall 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 Klipsch Heresy IV is approximately 1327.8cm2 / 205.8inch2 and base area of the KLH Kendall is approximately 805.6cm2 / 124.9inch2. The Heresy IV requires 65% 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 Klipsch Heresy IV weighs 20.45kg / 45lbs and the KLH Kendall weighs 22.14kg / 48.7lbs. This makes the Kendall 8% heavier than the Heresy IV.
Here is a comparison of how Heresy IV 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 Klipsch Heresy IV?
Here are the items that are included inside the box of Heresy IV:
- 2 Floor-standing loudspeakers
- 2 Detachable grilles (installed)
- 2 Base risers (installed)
- 8 Self-adhesive rubber feet
- 4 Jumper-straps (installed)
- Owners Manual
- Congratulations letter
- Klipsch brochure
What's in the Box of KLH Kendall?
Here are the items that come with the Kendall:
- Floorstanding loudspeaker
- Grille
- Foam port
- 4 Rubber feet
- 4 Spike feet (with nuts)
- 4 Protective discs
- Manual
 Sensitivity |
99 dB
vs
96 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
12 inches
vs
6.5 inches
|
Larger woofer |
 Height |
631mm
vs
1021mm
|
Easier to fit in smaller spaces |
 Max Input Power |
250 watts
vs
100 watts
|
Handle more power from your amplifier |
|
Number of Woofers |
2
vs
1
|
More woofers |
|
Low Frequency Response |
25 Hz
vs
48 Hz
|
Generates deeper bass |
 High Frequency Response |
23k Hz
vs
20k Hz
|
Generates higher frequency |
 Base Surface Area |
805cm2
vs
1327cm2
|
Takes less floor space |
 Price per pair* |
1500USD
vs
3198USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Klipsch Heritage Heresy IV |
KLH Kendall |
| Brand |
Klipsch |
KLH |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
up to 100 watts |
up to 250 watts |
| Sensitivity |
99 dB |
96 dB |
| Impedance |
8 ohms |
8 ohms |
| Frequency Response |
48-20k Hz |
25-23k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
2 |
| Woofer Size |
12" |
6.5" |
| Woofer Composition |
Fiber-composite |
Woven Kevlar |
| Woofer Surround Material |
Treated cloth |
Butyl Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
horn-loaded |
n/a |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
1.75" |
5.25" |
Physical Specs |
|
|
| Height |
631.0mm (24.8") |
1021.0mm (40.2") |
| Width |
394.0mm (15.5") |
212.0mm (8.3") |
| Depth |
337.0mm (13.3") |
380.0mm (15") |
| Weight |
20.45kg (45lbs) |
22.14kg (48.7lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood veneer |
MDF/Wood Veneer |
| Available Colors |
Black |
Black |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
10 Years |
10 Years |
| Labor Warranty |
10 Years |
10 Years |
These sit in different price classes - Klipsch Heresy IV costs roughly 2.1x what KLH Kendall 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 | B | KLH Kendall digs deeper - 25Hz against 48Hz. |
| Amplifier needs | A | Klipsch Heresy IV is more sensitive (99dB vs 96dB), so it goes louder on the same amplifier. |
| Headroom | B | KLH Kendall takes more power (250W vs 100W) - more in hand in a big room. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | Klipsch Heresy IV: bi-amping; KLH Kendall: bi-amping. Klipsch Heresy IV sits in a wider range (12 models), so a matched surround system is easier later. |
| Price | B | KLH Kendall is cheaper - $1,500 against $3,198, about 53% less; arguably a different class. |
A Klipsch Heresy IV B KLH Kendall
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?
KLH Kendall has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 48Hz anyway, so judge these on the other rows instead. If your amplifier is modest, vintage or valve-based, Klipsch Heresy IV is the safer partner - the other will want more current or more watts to sound its best.
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.