Thanks Guys. You've answered a lot of questions.
When I tested my subs (I've got 2), I connected the output of my sound card direct to the input of my sub's amps.
So to keep things uniform, I'll redo my sub readings going via my receiver.
Also I should read my receiver's manual. I didn't realise that in stereo mode, the sub is active.
(I do know that there is some modes where the sub is not active).
Thanks Heaps.
