This information pertains to the 55HX70, or any similar sets which use a center speaker channel input. I had been having a problem with video interference coming from the center channel input audio signal. This was especially noticable during high volume/sounds, or periods of stronger signal strength. I e-mailed Toshiba Customer Service and they told me that the center channel input is designed for line-level, or pre-amplified, signals only. I told them I thought this was wrong since: A) The manual clearly shows this connection from an amp/receiver to the center input on the TV ,(thus from the amplified center channel output); and B) the manual indicates to control volume with the amp/receiver, which is not possible if this were a line-level output. Toshiba insisted this should be a pre-amplified input only. This still didn't sound right to me so I contacted two different Toshiba service persons. Both stated that the center channel input is for pre-amplified levels only, and that using amplified signals could damage the internal amp and/or power supply. When I pointed out that the manual states NOTHING about this (and, in fact, shows the exact opposite), they both stated that the manual was wrong. Is there anyone with a Toshiba set (or knowledge of) that can confirm or refute this ? I've disconnected the center channel input until I can find out if this is true about Toshiba sets, or just a problem with my set.