Here the power reservoirs are unusual, large polypropylene films - in fact, there are no electrolytics at all in this large add-on board. Top quality audio components are used for this distortion cancelling, zero feedback circuit which has a very short signal path using matched complementary fets. The IC audio output stages of the Philips chassis have been deleted and the c.j. board takes over this function. Small 5532 type op amps remain inside the '7321' series Bitstream D/A chip and cannot be by-passed. A high quality polypropylene decoupling capacitor is added to the D/A convertor power supply line to help lift its performance.
A score of l6 marks was given, though those more appreciative of the sweeter, more musical aspects might well be tempted to score it higher; to some degree, systems and / or personal taste will play their part here.At this level the Sonographe SD22 represented only a modest improvement over the earlier l4 bit player series.