or is the sub-woofer separate?
If it came with the Phillips HTS then have a look at the manual.
There may be something listed in Phillips HTS3450/37 Parts List.
I have a Phillips HTS 3450/37 Home theatre system. I recently moved and seem to have lost my inter-connection cable for my sub-woofer. What do I do? guy at Radio Shack sold me a video cable. Cable is 15 p male-male. Phillips has been non responsive.