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Klipsch Heresy IV Review
Klipsch Heritage Heresy IV

Main Features

  • 1" horn-loaded Tweeter
  • 1.75" polyimide diaphragm compression horn-loaded Midrange
  • 12" Fiber-composite Woofer
  • 48-20k Hz Frequency Response
  • 99 dB Sensitivity
  • Impedance: 8ohms
  • Power Range: up to 100watts
  • Weight:45.00 lbs / 20.45 kg
  • Dimensions(HxWxD): 24-13/16"x15-1/2"x13-1/4" / 631.0 x 394.0 x 337.0mm
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Klipsch Heresy IV Review
Klipsch Heresy IV Klipsch Heresy IV
See at AMAZON

Klipsch Heritage Heresy IV is a 3-way Passive Bass Reflex Floor-standing speaker by Klipsch. It features a 1" horn-loaded Tweeter, 1 x 1.75" Midrange and 1 x 12" Fiber-composite Woofer. The speaker has a frequency range of 48-20k Hz and a sensitivity of 99 dB. Klipsch Heresy IV has an MSRP of 3198$ per pair.

Klipsch's Heritage Series of Loudspeakers

Heresy IV is a member of Klipsch's Heritage series of Passive speakers. Below you can see the main specs of these speakers.

Klipsch Heritage Series Speakers
Model Frequency SensitivityImpedance Woofer
Klipsch Forte IV
Compare
38-20k Hz 99 dB8Ω 1 x 12"
Klipsch Cornwall IV
Compare
34-20k Hz 102 dB8Ω 1 x 15"
Klipsch La Scala AL6
Compare
40-19k Hz 103 dB8Ω 1 x 12"
Klipsch Heresy IV
48-20k Hz 99 dB8Ω 1 x 12"
Klipsch Klipschorn AK7
Compare
34-19k Hz 103 dB8Ω 1 x 15"
Klipsch La Scala AL5
Compare
51-20k Hz 105 dB8Ω 1 x 15"
Klipsch Klipschorn AK6
Compare
33-20k Hz 105 dB8Ω 1 x 15"
Klipsch Heresy III
Compare
58-20k Hz 99 dB8Ω 1 x 12"
Klipsch Heritage Series Speakers
Klipsch Heritage Series Speakers


**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.

Frequency Response of the Klipsch Heresy IV Speaker

Klipsch Heresy IV has a Frequency response range of 48-20k Hz at ±3dB and Power Range of up to 100 watts. With a minimum frequency of 48 Hz, Heresy IV delivers moderate bass depth so depending on your use case, you might want to consider adding a subwoofer to your system.

To focus on the subwoofers that are in a similar price range with Klipsch Heresy IV, check out the Powered Subwoofers under $5000. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how Heresy IV's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Floor-standing Speakers
Klipsch Heresy IV
Min
Average
Max
High Frequency
Floor-standing Speakers
Klipsch Heresy IV
Min
Average
Max

Among the speakers in our database with a max MSRP price of 5000$ (Pair), these are the 5 Passive Floor-standing speakers that have the deeper bass levels than the Klipsch Heresy IV's 48Hz:

  • KLH Kendall with Low Frequency of 25 Hz (Compare w/ Heresy IV)
  • GoldenEar Triton Five with Low Frequency of 26 Hz (Compare w/ Heresy IV)
  • Monitor Audio Silver 500 7G with Low Frequency of 27 Hz (Compare w/ Heresy IV)
  • KLH Concord with Low Frequency of 28 Hz (Compare w/ Heresy IV)
  • SVS Ultra Tower with Low Frequency of 28 Hz (Compare w/ Heresy IV)

Impedance and Sensitivity

Klipsch Heresy IV's nominal impedance level is 8 ohms and has a sensitivity of 99 dB.

Sensitivity
Floor-standing Speakers
Klipsch Heresy IV
Min
Average
Max

8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Klipsch Heritage Heresy IV is not considered a difficult to drive speaker from nominal Impedance perspective.

Sensitivity

99dB of the Klipsch Heritage Heresy IV is considered a high sensitivity compared to average stereo speaker which makes Heresy IV an easy to drive from Sensitivity perspective. If you are planning to power your speaker with a Tube amp which are generally very low power, the Klipsch Heresy IV will be a good choice.

Check the amplifiers that are in a similar price range to the Klipsch Heresy IV:

  • Integrated Amps under 3000 USD
  • Integrated Amps under 5000 USD
  • Integrated Amps under 10000 USD
  • All Integrated Amplifiers

Input Type

Heresy IV has 5-Way post type connectors and lets bi-amping/bi-wiring. Bi-wiring can enhance the overall transparency of your loudspeakers by using separate speaker wires for the low and high-frequency drivers from a single amplifier. Bi-amping, on the other hand, involves using separate amplifiers for the high and low-frequency drivers, potentially resulting in a greater dynamic range and reduced distortion.

Klipsch Heresy IV External Dimensions and Weight

Klipsch Heresy IV has external dimensions of (Height x Width x Depth) 24-13/16 x 15-1/2 x 13-1/4inch (631.0 x 394.0 x 337.0mm ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of Klipsch Heresy IV is approximately 1327.8cm2 / 205.8inch2.

To get a better perspective on the real life size of Klipsch Heresy IV, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).

Klipsch Heresy IV Real Life Body Size Comparison
Klipsch Heresy IV Speaker Size Compared to a Compact Disc

Here we place the Klipsch Heresy IV virtually next to a standard width amplifier and turntable on a media center to get a better idea about the size.

Klipsch Heresy IV placed next to a Media Stand
Klipsch Heresy IV Floor-standing Speaker next to a Media Stand

Weight

The Klipsch Heresy IV weighs 20.45kg / 45lbs per piece. Here is a comparison of how Heresy IV's weight compares with the average, max and min weights in its class.

Weight
All Floor-standing Speakers
Klipsch Heresy IV
Min
Average
Max
Weight
Floor-standing Speakers under $5000
Klipsch Heresy IV
Min
Average
Max

How does the Klipsch Heresy IV compare to the Klipsch Heritage Forte IV?

One of the natural alternative to the Klipsch Heresy IV is the Forte IV which is located one step higher in Klipsch's Passive Floor-standing selection.

Check the Detailed Comparison of Klipsch Heresy IV vs Forte IV for more details.

Cabinet type and Materials

Klipsch Heresy IV has a Bass Reflex type cabinet and a MDF/Wood veneer finish. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.

Available colors

Klipsch Heresy IV is available in Black.

Does the Klipsch Heresy IV come with a Grille?

Heresy IV comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.

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
  • Recommended Accessories

    Here is a list of accessories that we think you may need for the Klipsch Heritage Heresy IV.

    • Speaker Cable and Connectors
      • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
      • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
      • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
    • Vibration Isolators: IsoAcoustics isolators more affordable options too.
    • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

    Warranty

    10 Years of parts warranty and 10 Years of labor warranty is generally provided by the manufacturer.

    Klipsch Heritage Heresy IV Alternatives in Passive Floor-standing Speakers
    Model Type Sensitivity Impedance Frequency
    Klipsch Forte IV
    Compare
    3-way 99 dB 8 ohms 38-20k Hz
    Klipsch Heresy III
    Compare
    3-way 99 dB 8 ohms 58-20k Hz
    Klipsch RP-8000F II
    Compare
    2-way 98 dB 8 ohms 32-25k Hz
    Klipsch RP-6000F
    Compare
    2-way 97 dB 8 ohms 34-25k Hz
    Klipsch Cornwall IV
    Compare
    3-way 102 dB 8 ohms 34-20k Hz
    B&W 603
    Compare
    3-way 88.5 dB 8 ohms 48-28k Hz
    Polk R700
    Compare
    3-way 88 dB 8 ohms 38-38k Hz
    Klipsch La Scala AL5
    Compare
    3-way 105 dB 8 ohms 51-20k Hz
    Frequently Asked Questions about Klipsch Heritage Heresy IV
    What is the External Dimensions of Klipsch Heritage Heresy IV
    What is the Speaker Sensitivity of Klipsch Heritage Heresy IV
    is the Klipsch Heritage Heresy IV an easy to drive speaker?

    Klipsch Heresy IV Detailed Specifications

    General
    BrandKlipsch
    Full Model NameKlipsch Heritage Heresy IV
    Speaker Type3-way Floor-standing
    Power Rangeup to 100 watts
    Sensitivity99 dB
    Impedance8 ohms
    Frequency Response48-20k Hz
    DRIVERS
    Woofer Size12-inch
    Woofer CompositionFiber-composite
    Woofer SurroundTreated cloth
    Tweeter Size1-inch
    Tweeter Typehorn-loaded
    Midrange Size1.75-inch

    CONNECTIONS
    Connector Type5-Way post
    Biamp InputsYes
    PHYSICAL SPECS
    Height631.0mm ( 24-13/16-inch)
    Width394.0mm ( 15-1/2-inch)
    Depth337.0mm ( 13-1/4-inch)
    Height631.0mm ( 24-13/16-inch)
    Weight20.45kg ( 45.00 lbs)
    EnclosureBass Reflex
    FinishMDF/Wood veneer
    Available ColorsBlack
    Mounting BracketNo
    GrilleYes
    Moisture ResistanceNo
    OTHER
    Handheld RemoteNo
    Parts Warranty10 Years
    Labor Warranty10 Years
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