I'd like to connect an Apple Airport Express to my A5+ Classic speakers to stream music from my Mac. I also wish to connect the speakers to my Samsung LCD TV. Is it possible to have simultaneous connections to the A5+ Classic?

Yes, there are 2 audio inputs on Audioengine powered speakers so connect the Airport Express to one input and the variable output from your TV into the other. Both inputs are "open" or active so you can leave 2 audio sources plugged in at the same time with no need to flip any switches.