Manufacturer: Sony
Model: APM-77, APM-77 W
Type: Loudspeaker
Years of manufacture: 1981 - 1988
Made in: Japan
Colors: American Walnut, Black
Dimensions: 405 x 745 x 325 mm (WxHxD)
Weight: 34,5 kg
Original price approx.: 1'998 DM

Technical data

Type: 3-way bass reflex
Chassis:
Low frequency: 230 x 230 mm flat diaphragm with 4 voice coils.
Midrange: 52 x 52 mm flat diaphragm tweeter: 26 x 26 mm flat diaphragm Power handling (nominal/music): 100 W / 200 W

Efficiency: 90 dB / W / m
Frequency response: 28 - 30'000 Hz
Transitional ranges: 700 Hz, 4'500 Hz
Impedance: 6 Ohm

Special Features

Square flat diaphragms
Level control for midrange and tweeter

Remarks
Other models in the same series:
Sony APM-6
Sony APM-8
Sony APM-33 W
Sony APM-55 W
Sony APM-66 ES
Sony APM-77 W
Sony APM-500
Sony APM-700