I received my 1909 today and just finished setting up.
I did notice a few things, some expected, some not. For some reason, my Xbox 360 wouldn't fully turn on unless it had the optical dongle connected, even though attaching it directly to my monitor with HDMI it worked without the dongle connected. No big deal, because I'm getting sound without the optical cable anyway.
Also, for some reason on my PC with Windows Vista Media Center, I had to disable bitstreaming Dolby Digital and DTS through HDMI for my recorded TV to play audio correctly. That's no big deal for me anyway, I don't really care whether its decoding the audio on my PC or on the receiver for that. (I'm sending out 7.1 24/96 PCM through the HDMI for everything else anyway, so its the exact same as far as I'm concerned.) I did have to use the EDID override mentioned in a thread in the HTPC forum to get my ATI 4850 to recognize the 1909, but that was expected.
Finally, my front speakers were set to large. They're rated by the Klipsch to go to like 34Hz or something, so I expected that, but that means that any two channel music I play (from the PC, lossless WMA rips of my CDs) doesn't use the subwoofer. I was all set to complain about how horrible this made the two channel music sound... and then I turned on the DynamicEQ and it sounds just as good as it does with the subwoofer, so no complaints really there.
So I don't plan on turning off DynamicEQ ever. I haven't done much with the Dynamic Volume yet, no need for it in the middle of the day, but I did have a question about those advanced codes which Logitech has added to my Harmony profile. I know there's an EQ On Volume On, an EQ On Volume Off, and then the 3 different Volume modes. Is it enough to press the Day mode button for example to turn that on? Or if I've got EQ On Volume Off, do I have to press EQ On Volume On and then Day?
Edit: To answer my own question apparently I have to put Volume on first and then Day.