Kenwood LSF-555 (circa 1997)

Documentation on the Kenwood LSF-555 is thin. Nearly everything known about it traces back to a single Japanese equipment database entry. The record shows a 2-way, 2-speaker bass reflex bookshelf design with anti-magnetic shielding, sold as a pair for ¥50,000 around 1997. It used a 15 cm cone woofer and a 2.8 cm dome tweeter, rated at 30W nominal and 60W maximum into 6Ω. Frequency response is 45 Hz to 30 kHz, and sensitivity is 85dB/W/m.

The engineering is in the details. Kenwood described the LSF-555 as developed "in pursuit of a point sound source," and the crossover is where that shows. The network uses an SS (Subtraction Series) configuration, where the same current flows through both drivers near the crossover frequency. The idea is that the combined energy of the two units equals the input energy, which gives an ideal crossover curve. The front baffle is what Kenwood called a DDD (Diffused Diffraction Design) baffle. Corners are minimized, and the distances from each driver to the baffle edges are deliberately unequal, so diffraction artifacts get dispersed instead of coloring the sound. The enclosure is MDF, but the baffle itself is aluminum die-cast to kill resonance. These are unusual choices for a mid-priced bookshelf speaker of the period.

Physically, it's a compact but substantial box: 216 × 352 × 326 mm and 8.1 kg per speaker. A Japanese-language owner's manual exists and circulates among collectors. One sold on eBay in April 2023 for $442 in "Very Good" condition, and a Russian marketplace listing has appeared at 40,000 ₽. Beyond that, there's no documented market history, no reviews, and no word on common failure points.

eBay Listings

KENWOOD LSF-555 Speaker HomeAudio Very Good

$442

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