3-Way Horn-Loaded Loudspeaker with Passive Radiator | Brisbane HiFi Specialist

The Klipsch Forte IV is a three-way floorstanding loudspeaker from Klipsch's legendary Heritage Series, combining high-efficiency horn-loaded architecture with contemporary driver and crossover engineering.

Featuring a 12-inch K-281 woofer, 1.75-inch K-702 midrange compression driver, 1-inch titanium high-frequency driver, and a rear-mounted 15-inch passive radiator, the Forte IV delivers exceptional dynamic capability from a relatively compact cabinet.

With a 99 dB sensitivity rating, the Forte IV is particularly well suited to both low-powered valve amplification and high-quality solid-state electronics.

At Brisbane HiFi, we recommend the Forte IV for listeners seeking the distinctive immediacy, efficiency, scale, and dynamic expression associated with Klipsch Heritage loudspeakers.

Key Features & Audio Engineering Highlights

High-Efficiency 3-Way Architecture

The Forte IV combines three dedicated acoustic sections:

• 1-inch K-100-TI titanium diaphragm HF compression driver
• 1.75-inch K-702 polyimide midrange compression driver
• 12-inch K-281 fibre-composite woofer

This architecture provides high acoustic efficiency while allowing each driver to operate within its intended frequency range.

Tractrix® Horn Technology with Mumps

The high- and mid-frequency compression drivers use redesigned Tractrix® horn geometry.

Klipsch's Mumps technology is incorporated into the horn design to help provide more consistent dispersion across the listening area and a broader usable listening window.

15-Inch Rear Passive Radiator

Rather than using a conventional rear bass port, the Forte IV incorporates a substantial 15-inch KD-15 passive radiator.

The passive radiator responds to pressure generated inside the enclosure and extends the low-frequency output to a specified 38 Hz while avoiding the need for a large conventional bass port.

Updated Crossover Network

The Forte IV uses a revised crossover architecture derived from engineering developed for Klipsch's Heritage loudspeakers.

The crossover divides the signal between the HF, midrange, and woofer sections while supporting the high efficiency and power-handling capabilities of the design.

Handcrafted Real-Wood Veneers

The cabinet is finished with carefully matched real-wood veneer.

Available finishes include:

• American Walnut
• Natural Cherry
• Black Ash
• Distressed Oak

The book-matched veneer construction gives each pair a distinctive, symmetrical appearance.

Bi-Wire / Bi-Amp Connectivity

The rear input panel incorporates robust binding posts supporting both:

• Bi-wiring
• Bi-amping

This provides additional flexibility when integrating the Forte IV with compatible amplification.

Product Specifications

Amplifier Matching

One of the Forte IV's defining characteristics is its 99 dB sensitivity.

This high efficiency means the loudspeaker can achieve substantial acoustic output with relatively modest amplifier power, making it particularly attractive for:

• Single-ended triode amplifiers
• Low-powered valve amplifiers
• Integrated valve amplifiers
• High-quality Class A amplification
• Solid-state integrated amplifiers

The 8-ohm nominal impedance also provides straightforward compatibility with a broad range of amplification.

Room Placement & Bass Integration

The rear-mounted passive radiator makes positioning relative to the rear wall an important part of system setup.

Trimira Audio can assist with:

• Rear-wall positioning
• Toe-in
• Listening distance
• Stereo spacing
• Passive-radiator clearance
• Amplifier matching
• Bi-wire versus single-wire configuration
• Room acoustic optimisation

The goal is to balance the Forte IV's substantial bass output with the acoustic characteristics of the room.

Why Choose Brisbane HiFi for Your Klipsch Heritage System?

Brisbane HiFi Heritage Showroom

Visit the Brisbane HiFi showroom to audition the Forte IV with high-quality valve and solid-state amplification.

In-Room Placement & Calibration

Our specialists can help optimise:

• Speaker positioning
• Rear-wall distance
• Toe-in
• Listening position
• Amplifier pairing
• System gain structure

Australian Support

Brisbane HiFi provides specialist support for Klipsch Heritage systems throughout Queensland and Australia, including local warranty assistance and carefully managed delivery.

What's Included in the Box?

• 2 × Klipsch Forte IV Loudspeakers
• 2 × Magnetic Woven-Grain Grilles
• Owner's Manual
• Official Klipsch Heritage Warranty Documentation