Panasonic VT50

Horror movie is ideal 

it will go through the same preamp stage as any other input. which could sometimes be detrimental to sound quality (if you're into that kind of thing).

for those that don't mind the signal going through multiple preamp stage, can connect the avr preout to the int amp input and remember the volume level at which the calibration is done. the target is to get the int amp preamp set at a gain of 1. amps with ht bypass will fix the volume gain at a constant level so that it doesn't change with the knob.
i believe only reserved at higher end of the chain. either use the method above or buy a separate stereo pre.