Hi (and thank you again!),
I apologize for not being clearer earlier...we never use anything other than the Samsung Smart TV. That is, we never watch anything via our iPhone or ipads, or via any other device.
Our Samsung TV has icons for Netflix, YOUTUBETV, Amazon Prime Video, etc. We click on each of those to watch stuff (on HDMI 1).
Occasionally, we watch things on the TV via HDMI 2 (which is Chromecast GoogleTV plugged into HDMI 2).
Your post inspired me to try our ipads. Interestingly, the apps I downloaded to the ipads (Netlix, Amazon Prime, YouTubeTV) all played just fine - the volume didn't vary at all (so far as we could tell).
I then went back to the TV, and I now believe the problem is isolated to when we use Chromecast Google TV (HDMI 2). That's when each Chromecast GoogleTV App seems to open at a different sound level.
I couldn't find an overall Chromecast Google TV setting for "Sound" or "Volume" or "Leveling," or for the individual apps with Chromecast Google TV (Netflix, etc.), and it doesn't seem like the Samsung "levelling" Setting affects any of Chromecast Google TV or the Apps within it.
Does everyone who streams Apps just adjust the volume every time they open one? It would be nice if each App remembered that user's sound preference...
Thank you again...
Alan
Try turning Samsung Auto Volume off. Then test the various sites - determine if the change makes any difference on one or more of the sites.
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Also right click the small speaker icon usually located in the lower right screen corner.
A five item menu should appear with each menu item, in turn, leading to any number of windows, tabs, and properties. Explore first and do not make any immediate changes. There may be other "equalization" like options somewhere that were "added in" via other software.
Then try the Troubleshooters. The troubleshooters may find and fix something.