Isabel, the latest version of the 1400 which has been shipped beginning the last week or so will have DPLIIx on the box or unit and a little manual supplement describing it. Any order should probably be by phone to confirm that the new version will be shipped.
As Nick pointed out, that particular brand comes only with a clear jacket, but other inexpensive brands are available in solid colors. Just for example, Parts Express has
this .
Also, note that you'll want to use a coaxial cable with an RCA plug on each end to connect to the sub, not speaker wire.
