test this bro...SONY HT-CT370.
using it right now.have 3 HDMI inputs 1 output. optical n support NFC.wireless subwoofer.

Definitely the Sony.

The LG has more forward and pronounced mids, while the Sony has a slightly better kick in the bass. Both aren't really that good in sound quality to be honest, but if these 2 are your choices, then the Sony is a no brainer because of its functionality it provides.

At this price, you'd probably want to look at the Sony CT780 instead. There was a Sony sale before that brought it down to 1.3k+ not too long ago. Year-end is coming up, so they usually do have a sale around then IINM.

What source are you playing?

Also, have you done your calibration yet? Understand that the included mic isn't really very good, it's better to manually set the audio levels by using a sound meter.

I meant, why not just connect your android box and HyppTV directly to the soundbar, then send the sound to your TV?
It's much simpler.
By playing a test tone and using a sound meter to measure the correct audible levels in relation to the distance you sit.

Generally, you want the front LR channels to be the exact same volume. The mid channel can either be the same or slightly boosted if you have difficulty hearing vocals.
The rears can be a little tricky, in a perfect environment you could set it to the same volume as the front LR. But unless you have designed-front-scratch HT room, this isn't actually that possible. I personally set it to 0.5 decibels lower than the front LR, but that's because I have them 0.8 meters directly behind my back. Correct rear speaker placement in a 5.1 setup is actually 30-45 degree behind the listener, not directly.

As for the source, is your player properly sending the correct signals to your RT5 or not?
Example, if you are playing a movie from your PC, is your PC configured to 5.1 in the audio settings and is your movie player using the correct bitstream format? Does your source even have at least DTS/DD5.1 encoded audio?

If from other players like say an android player or something, many of them downmix multi-channel source into 2.0 but still send out a wrong signal most of the time. People wouldn't notice it on their TV speakers because they are in stereo, but when you put it on a 5.1 setup then the difference becomes very obvious.

So yeah, make sure you have all the correct settings. I have no low volume issue, setting the volume to 26-28 is very adequate for me in any 5.1/7.1 movie/game. There are not effects that I could not hear or difficulty in discerning vocals.

Tip, set the listening mode to Standard (or Movie, since they're actually the same thing). All the other pre-sets are basically pre-EQ that kinda spoils the sound in one way or another.

Have you updated your firmware on your RT5? IIRC, the launch firmware had this bug. The latest firmware fixed this issue.

Then it's 1 of 3 problems you are facing:

1) Your source/player is stereo, not multi channel.
2) You set 2ch Stereo in your Sound Effect under Audio Settings which downmixes ALL multi-channel audio to stereo.
3) Your Audio Output is set wrongly, usually set it to HDMI + Speaker.
Cinema mode takes any source and expands it to 9.1, virtually. So this is why even if your source is stereo, your back speakers has sound. But since you said your 2 rear speakers doesn't work, then it's probably because your source is stereo in the first place.

Read the manual, may not be a very good one but all these things are answered in there.

You can de-select which input you do not want in the settings. Maybe try disabling USB input, set your input to HDMI 1 and then turn off the soundbar. Re-enable the USB input after that.

My RT5 remembers the input I last have it off.

No I don't have any volume issue. Max volume for me reaches 71db, that's just -4db from the reference 75db volume in home theater usage.

Few things you can try:

1) If you used the speaker calibration, I suggest to manually tweak it by measuring your own distance and input your own volume to each channel. Understand that the rears shouldn't sound louder than the front, many people don't understand this when doing multichannel setups.

2) Maybe don't use ARC at all, just connect everything directly to your RT5.

3) Try to use the Cinema 9.1 soundfield, but I only suggest that mode if you are playing 5.1 or 7.1 content. Using it for stereo content will make everything sound very tinny.