Took delivery of Velodyne VX10 t'other day. I was dismayed I couldn't get sound via the subwoofer pre-out on my Sony STR-DB930. I read manual and couldn't find out why - was puzzled cos the left, right pre-outs into teh sub gave sub-operation. So, can anyone guess what I was doing wrong? If not, I'll tell you........... You need AFD (Auto Format Detection) set as the sound field OR a DSP mode, e.g. Cinema EX B.