Correct speaker placement has become something of a lost art. Lots of people get it all wrong. As any self-respecting audiophile will tell you, it's not how big they are, but where you put them. Here's what you need to know.

The history of technology is littered with discontinued products that failed to enter the mainstream -- from unsupported home entertainment platforms to computing systems that were beyond their time. Despite ending up in discount bins at the time of release, these gadgets can now command top dollar on eBay and the like. This infographic looks at 12 dead and largely forgotten tech products that regularly sell for hundreds of dollars online.