Dynaco A-25 (1968–1970s)
A compact, high-performance two-way bookshelf speaker with aperiodic cabinet design and Scandinavian-engineered drivers.
Overview
The Dynaco A-25 is a compact, high-performance two-way loudspeaker system produced from 1968 into the 1970s. Manufactured by Dynaco, it was designed in collaboration with Seas of Norway and marketed as an aperiodic loudspeaker with exceptional bass response for its size. It became one of the best-selling speakers of the 1970s and was recognized as an iconic design. The A-25 was part of a broader speaker line that included the A-35, and it could be used with the optional CAB-1S passive crossover for bi-amping setups.
Specifications
| Driver complement | 10-inch extended excursion woofer matched to a specially-designed tweeter |
| System type | two-way, compact, high performance bookshelf speaker |
| Cabinet type | aperiodic |
| Designer | Seas of Norway |
Design
The Dynaco A-25 features an aperiodic cabinet design and uses a 10-inch woofer paired with a 3/4-inch dome tweeter, both engineered by Seas of Norway. The system was designed to deliver extended bass response from a compact enclosure, leveraging the aperiodic loading principle for improved low-frequency performance without porting.
Context
The A-25 was named a BEST BUY by Consumer Reports in 1970, sharing the distinction with the ADC ADC-303AX/II. It was praised as a Scandinavian-designed bookshelf speaker offering exceptional value and became one of the best-selling speakers of the decade. It was noted for its remarkable bass output from a small cabinet and remains a respected design, often compared to modern speakers in enthusiast forums.
Market
The main weakness of the A-25 is the potential for woofer burnout, though the speakers are otherwise considered very trouble-free. No specific maintenance or repair procedures were found in available sources.
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