Audio design has always been a subject that stirs the passions of most electronics engineers and a subject where the pursuit of perfection has many times comes before considerations of cost. That aside sometimes the simplest circuits can offer the best solutions in terms of cost and performance. A quick look at many new low power speaker amplifiers on the market highlights the move to class D audio performance, but when it comes to low cost, low
distortion and low noise, class AB still has the edge.