If will compare with the price , power watt and sound quality already. as a result must agree give Integrated amplifier 30W this north really. Because of circuit arrangement has designed completely model this circuit composes 2 a part. be tone control circuit get very the circuit model feed back tone control. Which be popular very extensively in contain divide. By circuit this circuit can fine the bass get 18dB at 100Hz frequencies and can fine the treble about 18dB at 10KHz part frequencies. The main Amp that can see that circuit Input be model Differential amp for output control of the circuit to 0V by live something feed back at Base of Q4 change R16 the expansion ratio of the circuit R16/R15 in circuit arrangement output that last. We very the circuit in the character Quasi – Complimentary. Then help economize more to use a pair complimentary loud directly be that we choose 2N3055 are output Q8,Q9.