Klipsch Heritage Heresy IV

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, continuing a design lineage that began in 1957. Originally conceived as a compact center channel for Klipschorn owners, the Heresy was named by Paul Klipsch himself, who called it a "heresy" to not use a corner horn. The Heresy IV maintains the series' signature horn-loaded three-way design, engineered for accurate sound reproduction across low, mid, and high frequencies using 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 uses a three-way horn-loaded design with a sealed enclosure, featuring a 12" fiber composite cone woofer, a titanium diaphragm midrange driver, and a titanium compression tweeter. It includes dual binding posts connected by jumpers, allowing for bi-amping or bi-wiring. The system is engineered to deliver precise, high-efficiency sound reproduction using premium components for durability and long-term performance.

Context

The Heresy series has been in continuous production since its introduction in 1957, originally serving as a center channel companion to the Klipschorn. The Heresy IV is part of Klipsch’s Heritage lineup, preserving the brand’s acoustic philosophy while incorporating modern materials and construction techniques. It remains a sought-after model for audiophiles and vintage audio enthusiasts.