Yes. Connect the cable box to one HDMI input on the TV, and PS3 and the DAV-HDX275 to the switcher. Then connect the switcher to the other HDMI input on the TV. You switch inputs with the remote control. I use the Apogee HDMI 3x1 Mini Switcher and it works flawlessly. It's on sale for $20.
http://www.supermediastore.com/apog...full-hd-1080p-25m-amplified-bulk-package.html
http://us.st12.yimg.com/us.st.yimg.com/I/supermediastore_2027_24769213
