Akai SW-157 (1978)

Little is documented about the Akai SW-157. The public record is a service-manual listing and one brief period directory entry. No factory specifications, design notes, sales history, or dedicated contemporary review of the base model have surfaced.

The most concrete description is under the "SW-157 II" name. HI-Fi-Stereo-Buyers (1980, p.206) listed it as a three-way floor-standing bass-reflex speaker system with a 12-inch rolled-edge cone woofer, a 5-inch cone midrange, and a tweeter with acoustic lens, crossing over at 2000 Hz. The same entry noted an LC quarter-section network with a two-position control switch (flat or HF-slope response), a 52 Hz resonance, and 4-ohm impedance. Whether the "II" suffix means a revised version of the original SW-157 or just a directory convention isn't recorded.

Apart from the period press, a 25-page factory service manual in English exists for the model. It is guaranteed to contain circuit diagrams. Service manuals of this type usually include printed-circuit-board layouts, block diagrams, exploded views, assembly instructions, and a parts catalog.

Known facts:

• Listed in HI-Fi-Stereo-Buyers (1980, p.206) as the "SW-157 II": three-way floor-standing bass-reflex system; 12" rolled-edge cone woofer; 5" cone midrange; tweeter with acoustic lens; 2000 Hz crossover; 52 Hz resonance; 4-ohm impedance.
• 25-page English factory service manual exists, with circuit diagrams and typically the full service-manual contents.
• No further specifications, pricing, production dates, or history documented.

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