Here the stereo power amplifier based on single IC STK4141II. This amplifier circuit will deliver 25W on each output channel.
Recommended voltage is 27.5V for 8ohms speaker and 24.5V for 4ohms speaker while the maximum voltage to supply this circuit should be about 41 VDC.
Heatsink usage on the power IC is a must.
Use this STK4141II Datasheet for your reference.