I used this for one year after purchasing it. It was bought for thousands of Taka, and it features a 15-inch speaker, a 3-inch voice coil, and a 2-inch voice coil magnet tweeter. The amplifier machine is built with 8 transistors, uses a copper transformer with 45-0-45 volts, and includes an additional 12-volt transformer. The machine requires about 3,000 Taka worth of repair work, and after getting this work done, it will be as good as new.