son of a $@!#. I've noticed the hum in the past and thought it was perhaps my cabling. I went out and got shielded gold ratshack cable instead of the dinky old cable i was using, but there was still a slight bit of hum. Just tried removing the svideo connector, and the hum was gone. This was the reason why I didn't jack up the sub volume, but instead have the receiver's sub trim at a higher level, although most of the HTF folks recommended doing it the other way around. Since I use the svideo switching function on the receiver, i guess i'll just have to leave it like this. Really annoying.