In this review, we will be comparing two different types of speakers. KLH Model Four is a Bookshelf speaker whereas the Heresy IV is a Floor-standing speaker.
Let's have a brief look at the main features
of KLH Model Four and Klipsch Heresy IV first before getting into our more
detailed comparison.
| Key Specs | KLH Model Four | Klipsch Heresy IV |
|---|
| Brand | KLH
United States · founded 1957 | Klipsch
United States · founded 1946 |
|---|
| Design | 3-way | 3-way |
|---|
| Tweeter | 1" Hard-Dome | 1" horn-loaded |
|---|
| Midrange | 4" | 1.75" |
|---|
| Woofer | 8" | 12" Fiber-composite |
|---|
| Frequency response | 46-20K Hz | 48-20k Hz |
|---|
| Sensitivity | 88 dB | 99 dB |
|---|
| Impedance | 6 ohms | 8 ohms |
|---|
| Power range | — | up to 100 watts |
|---|
| Weight | 21.32kg / 46.9lbs | 20.45kg / 45lbs |
|---|
| Dimensions (H x W x D) | 32.2" x 13" x 10.9"
817.9 x 330.2 x 276.9mm | 24-13/16" x 15-1/2" x 13-1/4"
631.0 x 394.0 x 337.0mm |
|---|
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
Drivers
Both Model Four and Heresy IV are 3-way speakers.
KLH Model FourKlipsch Heresy IV
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KLH Model Four |
Klipsch Heresy IV |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 4-inch |
1 x 1.75-inch |
|
Woofer
|
1 x 8-inch
|
1 x 12-inch
|
Model Four features a 1" Hard-Dome Tweeter, a 4" Midrange and 1 x 8" Woofer. On the other hand, the Heresy IV features a 1" titanium-diaphragm compression horn-loaded Tweeter, a 1.75" Midrange and 1 x 12" Fiber-composite Woofer.
Frequency Response
Model Four has a frequency range of 46-20K Hz whereas Heresy IV has a frequency range of 48-20k Hz. With a minimum frequency of 46Hz, the Model Four can go slightly deeper then 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 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.
Impedance and Sensitivity
Model Four is a 6 ohms speaker compared to the Heresy IV which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. Model Four sensitivity is rated at 88 dB and the Heresy IV's is rated at 99 dB. This 11 dB difference makes the Klipsch Heresy IV a more sensitive speaker compared to KLH Model Four, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf Speakers
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.
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 KLH Model Four's and Klipsch Heresy IV's external dimensions. KLH Model Four has external dimensions of 817.9 x 330.2 x 276.9mm () whereas 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).
KLH Model Four is 63.8mm narrower and 60.1mm less deeper than Klipsch Heresy IV but it is also 186.9mm taller.
Size, drawn to scale
Both speakers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same surface and pushed back to the same wall, so the deeper one visibly sticks out further.
Klipsch Heresy IV needs about 45% more floor or shelf area. Klipsch Heresy IV is 60mm deeper, so it stands that much further out from the wall. KLH Model Four is 187mm taller.
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 KLH Model Four is approximately 914.3cm2 / 141.7inch2 and base area of the Klipsch Heresy IV is approximately 1327.8cm2 / 205.8inch2. The Model Four requires 31% less surface area than the Heresy IV which gives it a small advantage on placement in tight spaces.
What's in the Box of Klipsch Heresy IV?
Here are the items that come with the 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