Above and below the picture is the end of the amplifier circuit, so-called booster amplifier. Picture above using 14 pairs of transistor MJ15025G and his partner MJ15024G . Transistor price range of $5 - $6 , has power output of 250W on each transistor , for more details , see datasheet of each transistor.
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|Installed transistor with resistor but still a mess|
Transistors MJ5025G and MJ15024G very fith with power amplifier 300 Watt subwoofer , 450 Watt , 600W , 750 Watt , 1050 Watt , 1200 Watt , and higher. The buffer and its driver using transistor not ic. For power schematic diagram can be found here.