I use my Sony DA4ES as a preamp only (do not use any internal amps) ... however, when pushing it hard yesterday playing a DTS demo DVD at -20db the Sony shut down with the display showing "Protection". It was pretty warm (the Sony)... it does have a good 6" of clearance above it. Is there a particular setting for the receiver that will do away with this annoyance? A way to disconnect the amps from power? Thanx in advance for your ideas/experiences.