Kenwood KL-555X (Late 1970s (approximately 1977-1979))

At 23kg, these floorstanders are heavy. They use a rare 3-way, 4-driver layout built around a 12-inch woofer.

Overview

The Kenwood KL-555X is not a subtle speaker. It was built in Japan in the late 1970s as a floorstanding system for audiophiles who wanted both power and precision. Owners report it was marketed as a high-end offering, meant to anchor a serious stereo setup with deep bass and a layered driver array. The cabinets are 650mm wide and weigh 23kg, so they need space. A contemporary listing calls it a "popular choice for audiophiles seeking a classic audio experience." It has walnut-grain finishes and a bass reflex cabinet. Its place within the Kenwood speaker family is undocumented, but the construction and spec sheet suggest it was positioned as a flagship-grade system.

Specifications

Key Features

12-inch Cone Woofer with Bass Reflex Cabinet

The low end comes from a 12-inch (300mm) cone woofer in a bass reflex enclosure. That design gives extended low-frequency output without needing a huge cabinet. The 30Hz lower limit on frequency response suggests real sub-bass reach, which was rare in consumer-grade systems of the late 1970s. The port helps with efficiency and dynamic headroom, particularly when the speaker is driven near its 50W power handling limit.

5-inch Midrange and Dual 2-inch Cone High-Frequency Drivers

This is a true three-way design, with dedicated drivers for mid and high frequencies. A 5-inch (130mm) midrange cone driver handles the vocal and instrumental range. Two 2-inch (50mm) cone-type drivers split the upper spectrum, one labeled as a tweeter and the other a super tweeter. They cross over at 5,000Hz and aim for smoother dispersion and extended airiness above 10kHz, which reduces strain on any single driver.

Internal Crossover Network with Defined Frequency Splits

An internal crossover network routes signals across the four drivers. The crossover points are 600Hz (woofer to midrange) and 5,000Hz (midrange to tweeters). The filtering keeps each driver in its optimal range, minimizing distortion and time-smearing. The crossover is accessible and replaceable, as listings for standalone units show, which suggests a modular design that helps repairability decades later.

96dB/W (1m) Sensitivity in a 23kg Cabinet

Sensitivity is rated at 96dB/W (1m), which is highly efficient by modern standards. Even modest amplifiers can drive these speakers to lively levels without strain, including the tube and mid-power solid-state units common in the late 1970s. The 23kg weight comes from dense wooden cabinet construction, which helps dampen resonance in the bass reflex design.

Collectibility & Value

Market data for the KL-555X is sparse. Individual parts are traded: a standalone crossover network sold for $10.00 in January 2024, and a single midrange driver (identified as 4", part number T06-0077-05, 8 ohm) listed for $25 on the same date. Complete pairs have appeared with asking prices from $200.00 plus shipping to EUR 250.00 (~US $271.14), often described as "TESTED," "Working," or in "Mint condition." No original pricing or production figures are documented, so rarity and depreciation are hard to judge. No common failures or maintenance requirements are reported, and the system appears to have aged reasonably well. Foam surrounds on the woofers and midrange drivers may need eventual replacement, a typical concern for speakers of this vintage.

eBay Listings

Vintage Kenwood KL-555X 3-Way Speaker System Crossover Netwo

$10.00

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• Kenwood kl-3090 (Late 1970s to early 1980s)
• Kenwood kl-7090 (Late 1970s (approximately 1977-1979))
• Kenwood kl-777 (1970s (circa 1975-1977))
• Kenwood kl-888s (Late 1970s (approximately 1978-1980))
• Kenwood ge-920 (Late 1970s (approximately 1977-1979))