Rich is an audiobook narrator and he just finished building his own vocal booth to record his audio files. But since the booth is so small, he wants to have his laptop on the outside with a monitor connected and a monitor on the inside. WIll an HDMI splitter do the job with a 2012 MacBook Air? Leo says that a splitter can degrade the image quality. The Air also has a mini display port, so he'd need an adapter for HDMI. They're pretty cheap. The Air won't really have an issue with the splitter.
Check out Rich's podcast: The Audiobook Speakeasy.