Amazon: Dayton Audio APA150 150-Watts Power Amplifier Apr 22, 2015Dayton Audio APA150 150-Watts Power Amplifier (Black) Has bridging ability to run a sub at 150w. Has an auto-on sensor. Low pass filter. Can daisy-chain them. This is a good little amp. No tone controls, but great for extra channels in another room. I use 2 of them to power outdoor speakers on my deck and patio with a bluetooth streamer and4.3/5(117) 150 Watt Power Amplifier Circuit Working and Applications It increases the voltage, current or power of the input signal. Amplifier 150 Watt Power Amplifier Circuit. Before going to discuss the concept of 150W power amplifier circuit lets know about the types of amplifiers, power amplifier circuit, concept of power amplifier and working of power amplifier.