The amplifier in the midle price category has the output power 2x20W in the Classs A and 2x40W with a continuous transition to the Class AB. This amplifier is cheaper because the demands on refrigerators, a source and effacing capacitors are not so great.

 But the view of "a snakes' nest" on the bottom picture showes that the amplifiers from this price category are not neglected in any way. All conductors for a distribution of feeding voltages and an active output power signalare properly elaborated.