Power amplifier assembled with TDA1512

The preamplifier part of this circuit uses the King of Op Amp NE5532* and the tone adjustment part uses NE4558. In the bass circuit,
resistor-capacitance components are reasonably selected and monitored by instruments, which improves 50Hz by 8dB compared to the original design, and has a strong bass effect. Since the treble attenuation is larger when the volume is turned on, the I-,s function is added to the circuit to ensure balanced high and bass output
even at low volume .     The circuit performance indicators are as follows:     (1) When Uc-±24V, PMPO can reach 2X250W;     (2) Frequency response: 20Hz~20000Hz●50Hz, the bass boost is the largest, optional ZOdB; the treble boost is 18dB;     (3 ) Distortion: ≤0,1%;     (4) Signal-to-noise ratio: 70dB.     When listening to this machine, I felt that the treble was bright, clear, and well-defined. 6. The bass was full and thick. When the bass boost was the largest, it had the vibration of a heavy bass. When the volume of Shake Effect 6 is turned on low, there is still obvious bass effect.