Technics SB-T20

The SB-T20 (also SB-T20K) was a 60-watt honeycomb disc speaker system manufactured by the Technics Corporation of Japan. It is a 2-way 2-speaker system with 18 cm honeycomb disc woofer, and 2.8 cm honeycomb disc tweeter. The dimensions of the cabinet are 23.0 cm × 75.5 cm × 22.5 cm, and mass 9.5 kg. In this service manual you can get detailed specifications of the crossover circuit diagram, and parts list. A nice feature of these speakers is that it has built-in circuit breakers for overload protection. If your speakers are not working, then this information may be very useful to you.