Dynaco A-25XS (circa 1973–1975)
The Dynaco A-25XS is a 2-way bookshelf speaker that appears to have been sold mainly in the Japanese market under the Dynaco/Scandyna banner. Documentation is thin. The most complete record comes from Japanese audio database entries and period catalogs. What they show is a carefully engineered compact speaker from the early 1970s.
The design uses a "dumped bass reflex" enclosure, a middle path between a sealed box and a conventional ported design. The baffle opening is filled with special glass fiber. The period literature claimed this combined the advantages of both enclosure types and avoided the weaknesses of each: the over-braking of a sealed system's low-frequency response and the "bass reflex sound" resonance coloration of a ported cabinet. The inner walls were lined with two layers of glass fiber and rock wool with different absorption coefficients to cut internal reflections.
The drivers are a 25 cm cone woofer with a laminated cone paper, polyurethane rubber surround, and an in-line 4-layer voice coil, a lightweight assembly designed for small excursions, plus a 2.7 cm soft dome tweeter. A 5-stage switch controls tweeter level, and the crossover is at 1.5 kHz. The enclosure is finished in walnut and weighs 9 kg. It measures 270 mm wide, 500 mm high, and 250 mm deep (the 1973 catalog lists the width as 290 mm).
Pricing was ¥35,000 per unit around 1973, later reduced to ¥32,000 in the 1975 catalog. The sensitivity spec is where things get curious. The 1973 catalog lists 95 dB, while the 1975 catalog lists 88 dB. That is a big gap, and it likely reflects a change in measurement method rather than a redesign. Frequency response is rated at 30 Hz to 20 kHz, max input 60W, impedance 8 ohms.
Beyond the Japanese database records, surviving evidence is mostly auction listings and owner chatter. One forum commenter noted the A-25XS "sound great with acoustic relaxed music but break up when things get fussy." That is a single data point. Used pairs appear periodically on Yahoo Auctions Japan, and at least one listing shows SEAS 25 TV-EW woofers being sold separately as A-25XS replacement parts, confirming SEAS supplied at least the low-frequency driver.
- Type: 2-way / 2-speaker bookshelf, dumped bass reflex
- Woofer: 25 cm cone; Tweeter: 2.7 cm soft dome
- Frequency response: 30 Hz – 20 kHz
- Max input: 60W; Impedance: 8 Ω
- Crossover: 1.5 kHz; 5-stage HF level switch
- Dimensions: 270 × 500 × 250 mm (width per 1973 catalog: 290 mm)
- Weight: 9 kg
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