Yes, I have seen the result of using Dynamic volume. Nevertheless it seems to be similar to a loudness control for an analog amplifier when I turn it to ON. Also I have use manual setup as I already told you, but this way dynamic volume is no longer working. It is only available when using audissey settings. It would be great for this AVR if it feature some sort of function similar to loudness , as per the legacy stereo amplifiers. It would allow the user to get better results for analog audio. At least this is my experience using this Denon AVR. Best Regards!!!
Manual Setup still uses Audyssey, therefore there is no reason Dynamic Volume should be disabled.
I just spent $30 on a digital audio optical cable and plugged it in to my 391 and I'm so stupid I can't figure out how to get the sound to come through the AVR
What is the source device? When connected to the source device, do you see light coming from the other end? If you are passing the audio from a smart app on the TV (eg. Netflix), ensure the TV is set to "external speakers" and connect the cable from the optical audio output of the TV to the Optical(TV) input on the 391 and select "TV" on the remote.
Also, you can purchase 6' optical cables for < $5 at Walmart, Best Buy, and Monoprice.