Kenwood LS-770A (ca. 1986)
A magnetically shielded bookshelf speaker using a double voice coil woofer and ion-plated titanium tweeter
Overview
The Kenwood LS-770A is a 3-way, 3-speaker bass-reflex bookshelf system made around 1986. It features magnetic shielding for safe use near video displays and integrates advanced driver technologies for its time. This compact speaker was designed to deliver extended low-frequency response and high-resolution audio, drawing from Kenwood's LS series engineering.
Specifications
| Playback frequency band | 33 Hz to 40 kHz |
| Max Input | 150W (EIAJ) |
| Impedance | 6 Ω |
| Output sound pressure level | approximately 92dB/W/m |
| Crossover frequency | approximately 900 Hz, 4 kHz |
| External dimensions | Width 280 x Height 510 x Depth 261 mm |
| Weight | 11.5kg |
| Woofer | 22 cm cone type with double voice coil |
| Midrange | approximately 7.5 cm Semi-dome Type |
| Tweeter | 2.5 cm dome type with ion-plated titanium diaphragm |
Design
The woofer uses double voice coil technology with two-stage magnets of opposite polarity and reversed current connection for strong, controlled drive and reduced distortion. It reportedly features a new HR carbon diaphragm and class A suspension for improved durability and linearity. The woofer edge employs a push-pull tangential design to enhance performance under dynamic loads. The midrange unit is reportedly magnetically shielded, and the system includes an acoustic level control for tonal adjustment.
Product Family
The LS-770A is a compact speaker system incorporating technologies from the broader Kenwood LS series, combining high-end materials and engineering in a bookshelf format.
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