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The Jensen AS-27 / Sigma SG-300 is a highly efficient, vintage triaxial speaker (often rebadged from Jensen to Heathkit) valued by tube audio enthusiasts for its natural, warm sound, efficiency (94%+), and low power needs (around 25W), perfect for vinyl/tube amps, but needs recap (electrolytic caps) and isn't for modern high-power solid-state gear. Reviews highlight its dynamic, "raw" sound, good mids, and efficiency, but note potential mushiness needing restoration (like cap replacement) for optimal clarity, offering a classic, detailed sound for low-wattage systems.
"Great for vinyl lovers and tube freaks like myself" (Reverb seller description).
In essence, they offer a classic, efficient, and lively sound but benefit greatly from restoration to overcome age-related degradation, making them a rewarding project for vintage audio fans.
The Jensen AS-27 / Sigma SG-300 refers to two different classic audio products: the Jensen AS-27 (often Heathkit branded) vintage triaxial speaker from the late '50s/early '60s (a large, full-range speaker for tube Hi-Fi) and the modern Sigma GJR-SG300 acoustic guitar (a solid Sitka spruce top, rosewood body, jumbo-size, all-solid wood beauty). The speaker specs focus on driver size (likely 12-15 inch with midrange/tweeter), impedance (8 Ohm typical), and power handling, while the guitar specs detail woods, construction (dovetail neck), scale length (25.4"), and features like Micarta fingerboard/bridge.
Jensen AS-27 / Heathkit SG-300 (Vintage Speaker)
Type: Full-range Triaxial Speaker.
Era: Late 1950s - Early 1960s.
Origin: Made in the USA.
Application: Designed for classic tube Hi-Fi systems.
Key Features: Three drivers (woofer, midrange, tweeter) in one frame for full-range sound.
Sigma GJR-SG300 (Modern Acoustic Guitar)
Body Shape: Grand Jumbo 14-Fret.
Top: Solid Sitka Spruce.
Back & Sides: Indian Rosewood (often laminated in the SG300).
Neck: Mahogany with a Walnut Strip, Low Profile.
Fingerboard & Bridge: Micarta.
Scale Length: 25.4 inches (645mm).
Nut & Saddle: Bone.
Construction: Dovetail Neck Joint.
Tuners: Grover.
Electronics (Optional): Sometimes includes a Fishman pickup system.
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