My wife and I bought an 49X900e last week and a Sony HT-CT390 sound bar/subwoofer today. We use the TV as a computer monitor plus "everything else" and so far we really like the TV.
Because the TV's audio system isn't the greatest, again, we bought the aformentioned sound bar. Unfortunately, although the soundbar has a separate, rather limited subwoofer volume control, it does not have an adjustable internal audio equalizer, so for when the TV is being fed by our Win 10 HTPC via HDMI 1, I installed on the PC a really nice, really effective Win 10 x64 sound equalizer program from Sourceforge and jacked up the lower end of the spectrum of audio frequencies according to my taste. Being a one-time organist, I used a youtube.com pipe organ solo video as a reference while making adjustments. In short, by the time I had completed making adjustments, I found it hard to believe that such a small audio system was the source of pipe organ sound so realistic. This proved to me that the soundbar/subwoofer is more than capable of producing great sound, but it must be fed a proper signal.
The reason I'm posting is that the soundbar's audio, when being fed by the TV's internal android Netflix, Youtube, etc. apps, as well as when outputting audio from a standalone BD disk player on HDMI 2, is only moderately better than the TV's own speakers, although there is a fair bit more bass noticeable on the former. I'm trying to figure out how to correct this situation.
The "equalizer" within the 900e's advanced "settings" menu is, quite frankly, poor. For example, if I remember right, the lowest frequency than can be boosted is 125 Hz, while the Win 10 equalizer allows adjustment right down to 20 Hz and then upward in rather small increments right up to 20 kHz, if I remember right. What I think is needed on the TV is some kind of android equalizer app that would do the same fantastic job that the Win 10 equalizer app does for Netflix.com and Youtube.com in Win 10. Is there such an android app available for the 900e?