It is a shame the company has not tried even modestly to keep that under control. We could argue average person can't hear distortion but noise is easy to hear (and measure). Clearly there was no noise specifications for the unit to meet. Modification of that architecture with new digital subsystem has sharply raised the noise level of the AVR-X4700H, reducing its performance across the board. My answer was that it had equal odds of being an accident seeing how these companies have no design specifications/metrics. Someone asked me in the review thread of Denon AVR-X3600H if the good performance of that AVR was by design. If you don't have any goals, you are likely to miss them! - Amir when reviewing Denon AVR-X4700H Luckily our hearing threshold is pretty high at low frequencies so this is more of an engineering issue than audibility. Performance at lower power levels and frequencies is not as good as 3600H due to high noise level. Let's start with HDMI input and leaving the unit as shipped (i.e. So we always start there by tapping the "pre-out" from the back of the unit instead of using speakers (to eliminate the effect of amplifiers). The heart of the audio subsystem in an AVR or processor is conversion of digital audio samples to analog. Appreciate everyone's patience until we get to the bottom of this. Some progress has been made but more work is needed. We are investigating the differences between our setups hoping to get more insight as to why we are getting different results. Their data does NOT show a regression from AVR-X3600H. NOTE: Denon engineering has been in contact with me and has shared their measurements with me. Why not state the bit depth and sampling rate of the audio as well? Sadly, it only shows video settings and not audio! What a shame. There is a nice diagnostic mode to show you the HDMI signal being received and transmitted to the TV. So please stay with me and pay attention to the notations on the graphs and review on what configuration is being tested. To avoid literally hundreds of combination of modes, I weave my way through the unit switching configurations back and forth as necessary to get through it. Testing these AVRs is a bit of a nightmare as features that should be orthogonal (independent) of each other, aren't as you will see in testing. Why Denon doesn't recognize that the center channel in movies carries most of the content and hence requires strong amplification is beyond me. In this regard, there is no improvement over the last generation AVRs. Alas, there is no way to do the same for the center channel which is a miss. For some of the tests, I selected the 11 channel mode which allowed me to reassign them to "external amp" which provides better performance in that configuration. I worry about long term reliability of this unit so I suggest assisted cooling if you are going to use it anywhere near full power.įor testing, I turned off the eco mode and operated the unit with just two large front right and left speakers. There is a fan under them but it did not come on. It was so hot that it was uncomfortable to touch the top of the case even though it is 1 inch or more removed from the heatsink. However, the right side of the unit where I think the front left and right channels exist, got very hot. In use, the unit was robust, never shutting down in 2-channel testing.
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