STK4172-2 power amplifier IC gives you a very low-noise ratio THD stereo 2x40w = 0.4% max supply voltage symmetrical 2x48v dc recommended value 8 ohm speaker with amplifier is feeding on a solid addition to the same pcb with passive tone, voice control circuit.
STK4172II AF Power Amplifier
• Small-sized package whose pin assignment is the same as that of the STK4101II series
• Built-in muting circuit to cut off various kinds of pop noise
• Greatly reduced heat sink due to substrate temperature 125 °C guaranteed
• Excellent cost performance