The Heco SMS 770 is a compact speaker produced around 1977 in Western Germany. It features a 3-way closed design that incorporates a woofer, midrange driver, and tweeter. The woofer has a diameter of 200 mm and is cone-shaped, while the midrange driver is a 38 mm dome, and the tweeter is a 25 mm dome. The speaker is designed to handle nominal power levels of 40 Watts and can manage up to 60 Watts for music. It has an efficiency rating of 88 dB at 1 W and 1 m, with a higher sensitivity of 96 dB at 5.8 W and 1 m. The frequency response ranges from 40 Hz to 25,000 Hz, allowing for a wide range of sound reproduction. The transitional frequencies are set at 1,200 Hz and 3,700 Hz. The speaker operates with an impedance of 4 Ohms. It is available in several finishes, including natural walnut, white, and graphite black. The SMS 770 measures 460 mm in height, 250 mm in width, and 200 mm in depth, making it a manageable size for various setups. Its build quality and sound characteristics reflect the craftsmanship of the era.
