In this review, we will be comparing Heresy IV and AK7, two Passive Floor-standing speakers by Klipsch
Let's have a brief look at the main features
of Klipsch Heresy IV and Klipsch Klipschorn AK7 first before getting into our more
detailed comparison.
Klipsch Heresy IV Key Specs
- 3-way Design
- 1" horn-loaded Tweeter
- 1.75" Midrange
- 12" Fiber-composite Woofer
- 48-20k Hz Frequency Response
- 99 dB Sensitivity
- Impedance: 8ohms
- Power Range:up to 100watts
- Weight:20.45kg
- Dimensions (H x W x D): 631.0" x 15-1/2" x 13-1/4"( 631.0 x 394.0 x 337.0mm )
Klipsch Klipschorn AK7 Key Specs
- 3-way Design
- 1" Tractrix horn Tweeter
- 3" Midrange
- 15" fiber-composite with a trihedral exponential folded horn Woofer
- 3" Midrange
- 34-19k Hz Frequency Response
- 103 dB Sensitivity
- Impedance: 8ohms
- Power Range:up to 100watts
- Weight:118.00kg
- Dimensions (H x W x D): 1347.0" x 31-1/4" x 28-1/4"( 1347.0 x 794.0 x 718.0mm )
Heresy IV and AK7 are members of Klipsch's Heritage series of speakers. Below you can find the loudspeakers from this series.
Klipsch Heritage Series
History
In the following sections, we will get into more detail in order to better understand how the Klipsch Heresy IV and Klipsch Klipschorn AK7 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 Heresy IV and AK7 are 3-way speakers.
| Driver |
Klipsch Heresy IV |
Klipsch Klipschorn AK7 |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 1.75-inch |
1 x 3-inch |
|
Woofer
|
1 x 12-inch
|
1 x 15-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 AK7 features a 1" polyimide diaphragm compression Tractrix horn Tweeter , a 3" Midrange and 1 x 15" fiber-composite with a trihedral exponential folded horn Woofer with a Crossover frequency at 380Hz - 290Hz.
Frequency Response
Heresy IV has a frequency range of 48-20k Hz whereas AK7 has a frequency range of 34-19k Hz. With a minimum frequency of 34Hz, the AK7 can go significantly deeper on the low side and provide stronger bass compared to the Heresy IV's min frequency of 48Hz.
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
Heresy IV and AK7 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 AK7's is at 103 dB. This 4 dB difference makes the Klipsch Klipschorn AK7 a more sensitive speaker compared to Klipsch Heresy IV, 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.
Heresy IV and AK7 has the same power range of up to 100 watts.
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 Heresy IV and AK7 features dual binding post speaker terminals for bi-amping or bi-wiring.
Klipsch Klipschorn AK7'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 Klipsch Heresy IV's and Klipsch Klipschorn AK7'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 Klipsch Klipschorn AK7 has external dimensions of 1347.0 x 794.0 x 718.0mm ( 53 x 31-1/4 x 28-1/4inch) .
Klipsch Klipschorn AK7 is clearly the larger of the two speakers. Its body is 400mm wider, 716mm taller and 381mm deeper than Klipsch Heresy IV.
Below you can see the front view size comparison of Klipsch Heresy IV and Klipsch Klipschorn AK7 in scale.
Comparison image of Klipsch Heresy IV and Klipsch Klipschorn AK7 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 Klipsch Klipschorn AK7 is approximately 5700.9cm2 / 883.6inch2. The Heresy IV requires 77% less surface area than the AK7 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 Klipsch Heresy IV weighs 20.45kg / 45lbs and the Klipsch Klipschorn AK7 weighs 118.00kg / 259.6lbs. This makes the AK7 477% heavier than the Heresy IV.
Here is a comparison of how Heresy IV and AK7'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 loudspeakers2 Detachable grilles (installed)2 Base risers (installed)8 Self-adhesive rubber feet4 Jumper-straps (installed)Owners ManualCongratulations letterKlipsch brochure
What's in the Box of Klipsch Klipschorn AK7?
Here are the items that come with the AK7:
2 Loudspeaker cabinets2 Subwoofer cabinets2 GrillesOwners ManualCongratulations letterKlipsch brochure
 High Frequency Response |
20k Hz
vs
19k Hz
|
Generates higher frequency |
 Height |
631mm
vs
1347mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1327cm2
vs
5700cm2
|
Takes less floor space |
 Price per pair* |
3198USD
vs
17998USD
|
costs less (*prices may change depending on the seller, location and time) |
 Sensitivity |
103 dB
vs
99 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
15 inches
vs
12 inches
|
Larger woofer |
|
Low Frequency Response |
34 Hz
vs
48 Hz
|
Generates deeper bass |
| General |
Klipsch Heritage Heresy IV |
Klipsch Heritage Klipschorn AK7 |
| Brand |
Klipsch |
Klipsch |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
up to 100 watts |
up to 100 watts |
| Sensitivity |
99 dB |
103 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
4 ohms |
| Frequency Response |
48-20k Hz |
34-19k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
12" |
15" |
| Woofer Composition |
Fiber-composite |
fiber-composite with a trihedral exponential folded horn |
| Woofer Surround Material |
Treated cloth |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
horn-loaded |
Tractrix horn |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
1.75" |
3" |
| Crossover Frequency |
n/a |
380Hz - 290Hz |
Physical Specs |
|
|
| Height |
631.0mm (24.8") |
1347.0mm (53") |
| Width |
394.0mm (15.5") |
794.0mm (31.3") |
| Depth |
337.0mm (13.3") |
718.0mm (28.3") |
| Weight |
20.45kg (45lbs) |
118.00kg (259.6lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Finish |
MDF/Wood veneer |
MDF/Wood veneer |
| Available Colors |
Black |
American Auburn, Black Ash, American Walnut |
| 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 |