Dynaco A-25XL (Late 1970s)
The A-25XL is the model Dynaco built when it couldn't leave the A-25 alone. It shares the original's cabinet footprint and acoustic-suspension design, but it has different drivers and a redesigned crossover. That is enough change to make the two different products, not a badge job. The "XL" treatment ran across the line (A-10XL through A-50XL), and the A-25XL sat near the bottom, above only the A-10XL.
The drivers are a 10-inch woofer (SEAS-made, treated paper cone with rubber surround) and a 1-inch SEAS soft-dome tweeter. The crossover point is around 1,500 Hz (some sources cite 1,800 Hz). Both drivers sit in a sealed, non-resonant, internally braced walnut-veneer cabinet. Nominal impedance is 8 ohms. Sensitivity is usually cited at 87 dB (some sources cite 89 dB). Recommended amplifier power runs 10 to 60 watts per channel (some sources cite up to 75W).
High Fidelity (June 1975, p.43) covered the A-25XL as part of a consumer's guide, pricing it at $110. The magazine's measurements found efficiency "moderately low but still surprisingly high for so small an enclosure," and noted the speaker could produce more than 10 dB of additional output before significant distortion on steady tones. They also observed that the XL offered a bit more detail at the frequency extremes than its predecessor, while sounding similar enough overall that the two versions "should make excellent companions" in a mixed stereo pair. Audio (November 1976, p.86) later listed the price at $109 and gave the full spec sheet: aperiodic suspension (highly damped vent), 20 × 11½ × 10 inches, 25 pounds.
Now the problems. The foam woofer surrounds rot and crack on virtually every surviving example. The early SEAS soft-dome tweeters fail open, and there is no direct replacement available. The grilles are famously fragile. If you find a pair, budget for a recap and surround replacement. When sorted, the A-25XL gives the warm, non-fatiguing sound of the A-25, with a slightly more modern top end. Original MSRP beyond those period listings is not reliably documented, and production dates are inconsistently stated across sources, though the late 1970s is the commonly cited window.
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