After building two other medium and high power Class D amps (see earlier posts) I thought I would like to hear what a IR (International Rectifiers) chip set base amp sounded like. This 250W module comes full assembled but, as with the others, you are required to make the PS etc.
I chose a 3U 19" rack mount enclosure. I required an enclosure this large because I wanted to use some very large and very expensive Mundorf M-Lytic capacitors I had. The PS can produce 420W and the capacitors are 2 X 47,000uf low ESR type. According to specs the caps can release several hundred amps. The usual RFI\EMI power filter fronts the 300VA transformer and gold plated brass speaker binding posts and RCAs grace the rear.
In other builds small fans are used to cool the power FETs but in this case a very thick Al block is used as a heatsink. For this reason this amp makes no noise where the others have a low fan noise. On a brief listen to the amp it sounds fine and more mellow and balanced than the other two. Further images will follow.