Klipsch Heritage Heresy IV

Name: Klipsch Heresy IV
Brand: Klipsch

A 3-way floorstanding loudspeaker with horn-loaded drivers and 99dB sensitivity, part of Klipsch's long-running Heritage lineup.

Overview

The Klipsch Heritage Heresy IV is a floorstanding loudspeaker in Klipsch's Heritage series. The design line goes back to 1957. The Heresy started out as a compact center channel for Klipschorn owners. Paul Klipsch named it himself, and the name was a joke on the idea of not using a corner horn. The Heresy IV keeps the series' horn-loaded three-way layout, built to reproduce low, mid and high frequencies accurately with premium materials and components.

Specifications

Sensitivity	99dB @ 2.83V / 1m
Power Handling (Continuous / Peak)	100W / 400W
Nominal Impedance	8 ohms
Frequency Response	48Hz-20kHz (±3dB)
Crossover Frequency	4500Hz
Tweeter	K-107-TI 1" (25mm) Titanium Diaphragm Compression Driver
Midrange	K-702 1.75" (44mm) Titanium Diaphragm Compression Driver
Woofer	K-28-E 12" (300mm) Fiber Composite Cone
Enclosure Type	Sealed
Inputs	Dual binding posts
Dimensions (H x W x D)	23.81" x 15.75" x 13.19" (605 x 400 x 335mm)
Weight	43.00 lbs (19.5kg)

Design

The Heresy IV is a three-way horn-loaded design in a sealed enclosure. It has a 12" fiber composite cone woofer, a titanium diaphragm midrange driver and a titanium compression tweeter. Dual binding posts are connected by jumpers, so you can bi-amp or bi-wire it. Klipsch built it for precise, high-efficiency sound, using premium components for durability and long-term performance.

Context

The Heresy series has been in continuous production since 1957, when it first served as a center channel companion to the Klipschorn. The Heresy IV is part of Klipsch's Heritage lineup. It keeps the brand's acoustic approach and adds modern materials and construction techniques. It remains a sought-after model for audiophiles and vintage audio enthusiasts.