Kenwood LSF-777
The Kenwood LSF-777 is a curious one. It appears to have been a late-1990s reference bookshelf speaker from Kenwood's Japanese domestic lineup, but surviving documentation is thin. Almost everything known comes from a single Audio Database entry and the existence of a 6-page Japanese owner's manual. What the record shows is a small 2-way bass-reflex design with some unusual engineering ideas.
The LSF-777 paired a 15 cm cone woofer with a 2.8 cm soft dome tweeter, crossed over at 2.2 kHz, in a 6 Ω cabinet rated at 30W nominal / 60W max input. Sensitivity was a modest 84 dB/W/m, with response claimed from 45 Hz to 30 kHz. Each speaker measured 216 × 352 × 326 mm (W×H×D) and weighed 8.7 kg, which is hefty for a bookshelf-type cabinet. The original price was ¥90,000 for a pair, around 1997.
The design philosophy is the interesting part. Kenwood developed the LSF-777 as "a reference speaker that embodies the concept of a point source," and the engineering backs that up. The front baffle uses what Kenwood called a Diffused Diffraction Design (DDD). Corners are rounded as much as possible, and the distance from each driver to the corners is deliberately unequal, which disperses diffracted sound waves. The baffle itself is aluminum die-cast to eliminate resonance, while the rest of the enclosure uses real wood and MDF. The network is an SS (Subtraction Series) design. The same current flows through both drivers near the crossover frequency, so the total energy of the two units equals the input energy. The aim was an ideal crossover curve. Terminals are gold-plated banana jacks.
A J-GLOBAL abstract describes the model as incorporating a "virtual point source method" into both unit mounting and baffle shape, which fits the point-source concept.
Beyond that, the record goes quiet. No production years are confirmed beyond the "around 1997" price reference. No THD or S/N figures exist in the documentation. No owner reviews with substantive sound quality opinions surfaced. Nothing places the LSF-777 relative to other Kenwood speakers in the lineup.
There is a little market activity. A HifiShark-tracked Yahoo Auctions pair of LSF-777s bid to ¥24,349 in mid-2026, with the listing described as "rare" and a "superior article." Another pair went for ¥5,250. There are also active listings on Russian classifieds and Korean forums, which suggests a small following in Asia. One YouTube pairing shows the LSF-777 driven by an Aiqin EL34B tube amp. That is a reasonable match given the 84 dB sensitivity, which wants a bit of power.
Known Specifications
- Type: 2-way, 2-speaker, bass-reflex, bookshelf, anti-magnetic design (EIAJ)
- Woofer: 15 cm cone; Tweeter: 2.8 cm soft dome
- Frequency response: 45 Hz – 30 kHz
- Rated input: 30W; Max input: 60W
- Impedance: 6 Ω
- Sensitivity: 84 dB/W/m
- Crossover: 2.2 kHz
- Dimensions: 216 × 352 × 326 mm; Weight: 8.7 kg
- Original price: ¥90,000 per pair (circa 1997)
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