Subwoofer Amplifier

I tried several types of amplifiers to be used for home theater systems. Among ab class and class d. The result I am satisfied with the sound of the chip STK4050. Power supply +-60V x2. And use the subwoofer kenwood 10 ". Under the clear spec of this amplifier.

• My subwoofer amplifier with four low pass tone control.
  

• Using toroidal transformer 50vac x2. I turn back the coil to increase the voltage.
  

• Using apex regulator to regulate voltage from 75vdc to 6ovdc. This regulator support at 10 ampere and using 2 pair of power output.
  

• Using 12oouf Elna capacitor for regulator part.
  

• Using diy subwoofer tone control.

• Using modified stk diagram from ampslab

• Digital voltmeter to view voltage drop.

• Subwoofer crossover on output speaker.