I too have a Belkin 25 pin cable, except that it's a replacement cable and not an extension, and it too gives me that echoing effect that went away when replaced w/ a BNC video cable thing. Belkin ...

Z-680 Owners Report!<BR><BR>The "monitor" cable running from the control pod to the subwoofer is way too short. However, the customer support people will tell you that a "logitech-approved" extension ...