Not being mean or anything but I had one of those sub cables before and cut it open to remove a piece of the shielding from the connector itself to try and get rid of a slight hum I was having. I cut it open I was surprised at how disappointing the quality was and didn't reuse it. Monoprice HDMI's are fine, but their analog cables are seriously lacking (my opinion).
For a quality and inexpensive sub-cable try LC-1 cable and one foot Y-cable Blue Jeans Cable.
http://www.bluejeanscable.com/store/subwoofer/index.htm