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
| Specification | Klipsch Forte IV |
|---|---|
| Speaker Architecture | 3-Way Horn-Loaded Floorstander with Rear Passive Radiator |
| Frequency Response (±3 dB) | 38 Hz–20 kHz |
| Sensitivity | 99 dB @ 2.83 V / 1 m |
| Power Handling | 100 W Continuous / 400 W Peak |
| Maximum SPL | 116 dB Continuous |
| Nominal Impedance | 8 Ω Compatible |
| High-Frequency Driver | 1-inch K-100-TI Titanium Diaphragm Compression Driver |
| Midrange Driver | 1.75-inch K-702 Polyimide Compression Driver |
| High-Frequency Horn | K-79T Horn |
| Midrange Horn | K-703-M Tractrix Horn |
| Low-Frequency Driver | 12-inch K-281 Fibre-Composite Cone Woofer |
| Passive Bass Radiator | 15-inch KD-15 Rear-Mounted Passive Radiator |
| Crossover Frequencies | 650 Hz / 5.2 kHz |
| Enclosure Material | 3/4-inch MDF with Real-Wood Veneer |
| Inputs | Dual Binding Posts / Bi-Wire / Bi-Amp |
| Dimensions (H × W × D) | 908.1 × 422.4 × 330 mm |
| Net Weight | 32.7 kg Each |
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
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Klipsch Forte IV
American Walnut
Brisbane HiFi 202/14 Trafalgar St, Woolloongabba, 4102
14 Trafalgar Street
202
Woolloongabba QLD 4102
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