Dynaco is probably more familiar as a manufacturer of hi-fi electronics, but Scan Dyna, based in Denmark, built high quality hi-fi speakers during the 1970s that are still well regarded today. Features such as aperiodic damping and large soft-dome tweeters, were sophisticated developments that "raised the bar" for affordable speakers. Several companies, including Scanspeak, Dynaudio, and SEAS have roots that lead back to Dynaco.

The speakers had walnut veneer, and were assembled by B&O’s woodshop. The patented aperiodic design provided smooth response, good bass definition, and a more resistive load. Power ratings used the DIN 45.500 test method, and were quite conservative.

A-10, smallest of the family, released in 1971. 170mm LF, 38mm HF. Aperiodic vented. Well regarded, with very acceptable performance

A-25, most popular model, with over 1 million sold from 1969~1979. 250mm LF. 38mm textile dome HF. Aperiodic enclosure. Designed by M Stauning and Ed Laurent. Early A-25's had the port above the tweeter, later moved underneath the woofer.

A-35, 2-way system, in a slightly larger, dual chamber aperiodic enclosure. Smooth, articulate sound.

A-50, largest of the Dynaco family. 2x 250mm LF, and one 38mm soft dome HF, in a big, dual chamber aperiodic enclosure.

Sadly, the speakers were rather bland-looking, and because they were often sold for far below their true market value, they were widely regarded as 'department store' speakers. Nothing could be further from the truth. Later X and XL series speakers tried to capitalize on the success of the early products and while they were respectable speakers, the insanely low prices were never repeated.

Unfortunately for us, we rarely see these speakers for repair. Dynaco used rubber edges on their woofers, which don't rot away, and the sort of abuse that ended with burned voice coils or blown tweeters doesn't usually get repeated. The most common of the occasional failures that we see in Dynaco speakers are accidental damage to the woofer voice coil. They date from an era when 35 watts was considered ‘high-power’. As long as their unusually shallow cone is not physically damaged, woofers can be repaired quickly, at very reasonable cost. And if the cone has been damaged, we keep a couple of spare drivers in stock, generally salvaged from enclosure that someone unwisely painted. Why i\s it always purple or black?.