CyberHome CH-DVD 500 Progressive-Scan DVD Player
Sub Woofer channel
I've used this player off and on for about a year and have no complaints other than the sub woofer channel apprears not to work.  Tried every possibility and after reading these reviews, I think it is the player.  If anyone has had a similar problem, please contact me.  I'll probably buy another player and see if the problem corrects itself.