I'm interested in the W3 wireless adapter and the A2 speakers to extend TV sound into another room. Can I do this?

Yes; you would need to connect the W3 Sender to the line-level outputs or headphone jack of the TV and the W3 Receiver to the analog input of the speakers. You'll need a second USB power adapter or iPod charger for this application. These power supplies are inexpensive and can be found at your local electronics store.