Denon VS-370 (circa 1976)

The Denon VS-370 is a 3-way, 3-speaker bookshelf system from around 1976, originally priced at ¥65,000 per unit. The cabinet is hermetically sealed. The front baffle is 19mm lumber core, the rest is 25mm particle board, and it's finished in real wood veneer. At 23.5kg and 647mm tall, it's a substantial bookshelf speaker by any measure.

The big technical feature is Denon's collagen cone construction. Collagen fibers were extracted from animal skin by chemical treatment and fused into the cone paper, which controlled internal loss and split resonance. The same treatment went into the edges. The woofer (30cm, 30RW11B) and the midrange (12cm, 12RM22) both use this cone material. Denon claimed it prevented the tonal discontinuities that can plague multi-way designs. The woofer's magnetic circuit used an Alnico cast magnet, and its frame was mounted to the baffle with synthetic rubber isolation. The midrange reached 12,000 gauss flux density, and its aluminum die-cast frame had a back cover to shield it from woofer vibration. A continuously variable level control for mid and high frequencies sits on the network, which used low-DC-resistance coils and paralleled capacitors to minimize error.

Specs are respectable for the era: 40 Hz - 20 kHz ±5 dB, 80W maximum input, 8Ω impedance, 87 dB/W/m sensitivity, and crossover points at 280 Hz and 2 kHz. The drivers are laid out symmetrically on the baffle, so left and right channels stay consistent in directionality.

Documentation on the VS-370 is thin beyond the technical record. No production years beyond "around 1976" are confirmed, and no period reviews have surfaced. The cabinets have found a second life in the DIY community. One Japanese auction in 2024 sold a pair of homemade speakers built around Rogers 30cm woofers mounted in VS-370 cabinets. A catalog for the model also periodically appears on Yahoo! Japan auctions.

Known Specifications

• Type: 3-way, 3-speaker, airtight bookshelf
• Drivers: 30cm cone woofer, 12cm cone midrange, 5cm cone tweeter
• Frequency response: 40 Hz–20 kHz ±5 dB
• Maximum input: 80W (program source)
• Impedance: 8Ω
• Sensitivity: 87 dB/W/m
• Crossover: 280 Hz, 2 kHz
• Dimensions: 386 × 647 × 296 mm (W×H×D)
• Weight: 23.5 kg

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