![]() The truth is that what you perceive as the final sound is a combination of multiple factors and most AVRs are severely power-limited because of cost constraints. An AVR may or may not, depending on its design and power supply - and the sensitivity of the speaker, be able to adequately provide the needed level of power. Movies may have peak power levels up to 25-30dB above the mean listening level (which for THX calibrated systems is 85dB at listening seat). If they aren't you will hear a difference. If the gain is the same there is no change. The gain of the amplifier, if different from the one inside the AVR, will affect the volume level at a given position - however this is temporary.
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