Dynaco A-25 (1968–1970s)

A compact two-way bookshelf speaker with an aperiodic cabinet and Scandinavian-engineered drivers.

Overview

The Dynaco A-25 is a compact two-way loudspeaker built from 1968 into the 1970s. Dynaco designed it with Seas of Norway and sold it as an aperiodic speaker with exceptional bass response for its size. It became one of the best-selling speakers of the 1970s. The A-25 belonged to a speaker line that also included the A-35. The optional CAB-1S passive crossover let you use it for bi-amping.

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 A-25 uses an aperiodic cabinet with a 10-inch woofer and a 3/4-inch dome tweeter, both made by Seas of Norway. The aperiodic loading is there to get extended bass out of a small box without porting.

Context

Consumer Reports named the A-25 a BEST BUY in 1970, sharing the honor with the ADC ADC-303AX/II. Reviewers praised it as a Scandinavian-designed bookshelf speaker with exceptional value, and noted its remarkable bass output from a small cabinet. It became one of the best-selling speakers of the decade. Enthusiast forums still compare it to modern speakers.

Market

The main weakness of the A-25 is woofer burnout. Otherwise the speakers are considered very trouble-free. No specific maintenance or repair procedures turned up in available sources.