Klipsch Forte (1985)

At 98dB sensitivity, it demands little but delivers a room-shaking roar when fed serious power.

Overview

The Klipsch Forte isn’t a speaker that tiptoes into a room—it announces itself the moment the first note hits, with a dynamic punch and clarity that stunned listeners in 1985 and still turns heads today. Born from the arrival of the CD format and the growing appetite for home theater, the Forte was Klipsch’s answer to a new era of high-resolution audio. True to Paul Klipsch’s lifelong obsession with efficiency and low distortion, the original Forte used horn-loaded tweeter and midrange drivers, delivering 98dB sensitivity with just one watt. That efficiency meant even modest amplifiers could drive them to lifelike levels, but it was with high-wattage gear—like the Hafler and Adcom monoblocks commonly paired in dealerships—that the Forte truly came alive. Owners report that in a showroom setting, the speaker’s effortless slam and startling dynamics often left customers laughing in disbelief. One review from Stereo Review in 1986 put it plainly: the Forte’s low-frequency distortion was “by far the lowest we have ever measured,” and its sensitivity so exceptional that “comparison with most other speakers is impossible.”

Despite its technical prowess, the original Forte had quirks. The midrange was wired out of phase with the woofer and tweeter, a design choice that some listeners found altered the tonal balance in subtle but noticeable ways. The crossover, tucked behind the rear jack panel, used a mix of iron-core and air-core inductors, along with blue KSC mylar capacitors—solid components for the time, though later owners often upgraded them for tighter control and clarity. The cabinet housed serious engineering in a relatively slim footprint, a trait Klipsch highlighted as a major selling point: huge sound without the bulk. Over time, the Forte developed a cult following, particularly among those who appreciated its raw, unapologetic delivery. It wasn’t trying to be polite—it was built to move air and command attention.

Specifications

Manufacturer	Klipsch
Product type	Floorstanding loudspeaker
Sensitivity	98dB @ 1 watt
Frequency response	32Hz-20kHz ± 3dB
Power handling	100 watts continuous
Impedance	The impedance rose to a peak of 20 ohms at 65 Hz, then dropped back to 8 ohms at 200 Hz

Key Features

Horn-Loaded Tweeter and Midrange

True to Klipsch’s core design philosophy, the Forte employed horn-loaded drivers for both the tweeter and midrange. This wasn’t just about volume—it was about control. Horn loading increases driver efficiency while reducing distortion, allowing the speaker to reproduce transients with startling speed and precision. The result was a midrange that cut through dense mixes without strain and a tweeter capable of shimmering highs without harshness. These drivers were central to the Forte’s reputation for clarity, especially with early CDs, which exposed the limitations of many contemporary speakers. The horn geometry helped project sound evenly across a wide listening area, contributing to what Stereo Review called “one of the widest and smoothest” room responses they’d ever measured.

Out-of-Phase Midrange Wiring

One of the more debated aspects of the original Forte is that the midrange driver was wired out of phase relative to the woofer and tweeter. This unusual configuration altered the acoustic summation between drivers, potentially affecting the speaker’s tonal balance and imaging precision. While not universally criticized, it was a point of contention among technicians and audiophiles. Whether this was a design oversight or an intentional compromise to manage lobing patterns remains undocumented, but it’s a quirk that owners must account for when setting up or restoring these speakers.

Internal Crossover with Iron-Core Inductor

The Forte’s crossover is mounted inside the rear of the jack panel, a space-saving design that also protected the components from tampering. The crossover used an iron-core inductor on the woofer—effective for power handling but potentially prone to saturation at high levels—and an air-core inductor on the tweeter, which preserved high-frequency detail. Capacitors included blue KSC mylar film types, known for their reliability, plus a single KSC electrolytic capacitor on the woofer circuit. While functional, these components became a common target for upgrades. Enthusiasts in the 2000s routinely replaced the film capacitors with higher-tolerance models, swapped in audio-grade resistors, and upgraded the electrolytic cap for improved bass control. The tweeter’s inductor was also sometimes replaced with a larger-gauge air-core coil to reduce inductance losses.

Transformer-Based Midrange Attenuation

Rather than using a simple resistor to attenuate the midrange output, the Heritage series Forte models—including later reissues—employed a transformer. This approach preserved impedance matching and minimized signal loss, a more sophisticated solution than resistive padding. Transformers can introduce their own coloration if poorly designed, but in this case, the implementation was used to match volume instead of using a resistor. This attention to detail reflected Klipsch’s commitment to high-fidelity engineering, even in passive circuitry.

Historical Context

The Klipsch Forte was introduced in 1985, a pivotal moment in audio history. The compact disc had arrived, promising pristine digital sound, and home theater systems were beginning to emerge with Dolby Surround decoding. Klipsch saw an opportunity to blend high efficiency with modern performance demands, resulting in the Forte. It competed against popular models from Polk Audio, Boston Acoustics, Mission, Infinity, Advent, and JBL—brands that often prioritized aesthetic integration over raw output. The Forte stood apart with its horn-driven design and commanding presence. In 1989, Klipsch retired the original model and replaced it with the Forte II, which featured a redesigned Tractrix horn midrange, a larger 15-inch passive radiator, and magnets for grill attachment. The Forte line was later revived in 2017 as the Forte III, part of Klipsch’s Heritage series, and updated again in 2021 as the Forte IV with modern materials and cosmetics.

Collectibility & Value

Original Forte models were available in a wide range of wood veneers, including exotic options like macassar ebony, zebrawood, rosewood, and teak. However, around 1990, Klipsch discontinued these finishes due to environmental concerns about rainforest sourcing, making early examples with rare veneers particularly desirable. While no original MSRP is documented in the fact sheet, a 1985 price of $1,100 per pair has been reported, which was substantial at the time. Today, used Forte I and II models occasionally appear on the market, with Forte IIs reportedly selling near $1,000 per pair in recent trades. Maintenance is a key consideration—horn diaphragms can degrade over decades, and Given their reputation and efficiency, well-maintained originals remain sought after, especially by those who value vintage high-sensitivity designs.