curious why you posted this in the dell forum. did it come with your dell? either way, altec lansing is going to be the one you'll want to contact.
http://www.alteclansing.com/ae/us/page/contact/
There is a Dell Zyluk subwoofer which is probably the same unit re badged. I have one I found, and I am completely stumped on how the 9 pin male d connector inputs audio and outputs to satellite speakers. I Dell or Altec Lansing websites?