Dynaco SE-10 (1968–1970)

The Dynaco SE-10 is a small two-way speaker system produced from 1968 to 1970, originally priced at $77.00 each. It was part of Dynaco's family of speakers that included the A-10, A-25, and A-50, and was sometimes used as a rear channel in a quadraphonic Dynaquad setup — the period literature describes it as "a small sealed box semi-omni speaker." The design is an aperiodic/acoustic suspension type, using a 5-inch driver (model #37070) and a 1-inch driver (model #37075), the latter being a dome tweeter.

Specifications across sources are broadly consistent, though the low-frequency rating varies. The commonly cited figures: 8-ohm impedance, 10–60 watts rated power, and a frequency response of 65 Hz to 20,000 Hz (one source lists the low end as 45 Hz). Dimensions are 178 × 229 × 152 mm (7 × 9 × 6 inches), and each speaker weighs about 2.3 kg (5 lbs).

Audio (April 1977, p.69) included the SE-10 in its coverage of equalizers, listing its frequency response as 10 Hz to 35 kHz, ±1 dB, with adjustable gain from −12 dB to +6 dB, an input impedance of 50 kilohms, and an output impedance of 600 ohms — a reminder that Dynaco also marketed the SE-10 name for a separate equalizer component. The speaker itself received no formal professional review in the major audio press; most of what owners report comes from forums.

Owner reports are generally positive. On Audiokarma, users describe the SE-10s as "fantastic speakers" that are "very decent sounding when paired with good amplification," though the midrange is "a bit forward." Common maintenance items: the crossover capacitors need recapping, foam surrounds may need replacement, the foam behind the grille deteriorates, and the grille cloth is fragile and tears easily. Replacement parts are no longer available from Dynaco, as the company is defunct. The speakers are "hard to find in good condition."