Kenwood LS-407B
The Kenwood LS-407B is a 3-way bass-reflex floor-standing speaker system. Documentation on this model is thin. The reliable record comes down to a single Japanese spec sheet, but what that sheet says is clear enough.
It uses a 25cm cone woofer, a 6.5cm cone squawker, and a 2.5cm horn tweeter, with crossover points at 900Hz and 6kHz. The cabinet is bass-reflex, rated for 70W maximum input at 8 ohms, and the frequency response is listed as 40Hz to 20kHz. It's a big box: 340mm wide, 620mm high, 345mm deep, and 17.0kg.
The LS-407B appears in period Kenwood advertising alongside the larger LS-1900 and LS-1200 models. High Fidelity (1978, p.172) listed it at $245, which put it at the budget end of that 1978 Kenwood speaker range. An earlier High Fidelity (1978, p.172) rundown noted its 8-ohm impedance and 10-watt minimum power recommendation. That sits comfortably with the 70W continuous rating on the Japanese spec sheet.
Plenty is still missing. No production years are confirmed, no sensitivity rating survives, and there's no documented information on the crossover components or terminal type. If you own a pair and can fill in any of those gaps, the archive would be glad to hear from you.
- Type: 3-way bass-reflex, floor-standing
- Drivers: 25cm cone woofer, 6.5cm cone squawker, 2.5cm horn tweeter
- Frequency response: 40Hz – 20kHz
- Maximum input: 70W (250W max per period listing)
- Impedance: 8Ω
- Crossover: 900Hz, 6kHz
- Dimensions: 340 × 620 × 345mm (W×H×D)
- Weight: 17.0kg
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