why is there No audio from HD PVR of Pioneer VSX-1019AH-K ?

I’m not an expert but I own a 919, the only thing I canthink of is switching between the memories modes so from memory 1 to memory 2to test the sub because it might be a memory setting issue. By your statement Ibelieve that you probably have the left and right speakers set to large. Thatbeing the case, in Dolby Digital or DTS 5.1 surround sound, the subwoofer willreproduce only the sound from the LFE channel. In stereo or when creating 5.1from a two-channel source, if you don't have the left and right speakers set toSmall the sub will not output sound as there is no LFE channel in thoseformats. A thorough read of your owner's manual is in order with specialemphasis on speaker size and crossover setting.