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Your TV speakers should be turned all the way down or off when you use a separate sound system such as a soundbar. Using them with the soundbar may cause echoes and the TV speakers do nothing to improve the sound.
Look at your TV's audio menu. If you can, turn the TV speakers off completely at the menu. Also see if you can set the analog audio output to "variable." This will allow you to control the soundbar's volume with the TV remote.
Your TV may have a setting to make its Audio Output Variable or Fixed. That is, as you turn the TV's volume down or up it will either vary the output (as it seems to be doing in your case) or keep it Fixed so external electronics can still use it when the TV's volume is down or off. Some TV's do it another way - they have a selection to turn the TV's speakers OFF.
My thoughts is to look through the menus. You may have the option to turn the TVs speakers off and use the Variable Audio outputs. Many use this feature to connect their audio to a surround sound system. Just a thought.
Since you have it hooked up to the stereo system, you need to go to on screen audio set up and turn off the TV built-in speakers (you will be listening the TV sound through your stereo system speakers), then go to the audio output set up and set it to 'variable' so the audio output of the TV's RCA audio out put will vary with the volume control of the TV (not all TV will alow this function), you will need to set the stereo volume to certain level (around 9~10 O'clock setting) since the sound coming from the TV will be controlled by the TV remote volume control. You can otherwise set the TV output to be at 'fixed' level, which means the sound output of the TV will not be controlled by the TV remote volume control, you will use the stereo remote volume control to adjust the sound level instead. I hope this is clear to you.
I would suggest moving them close to the base unit (if you havent already) to see if that improves the sound quality. If so, then you know you have some kind of interference in the area. Also, what output are you using from the BOSE? If you are using a headphone output or other variable output, you may be overloading the input circuit of the wireless base unit. Try turning down the volume on the BOSE or connecting to a different output.
There may be a setting in the TV's menu to set fixed or variable output for the rca's. You want variable. Some have two sets of audio outputs for fixed and variable. Depends on the TV. Check those two things. If no help let me know what the TV is and we'll see what we can do.
On some sets that have audio output jacks, the level of the audio output on the RCA jacks is fixed, and it does not change with the TV's volume control. On some sets, such as Sony, you can choose fixed or variable output. I have also seen some sets that have both fixed and variable RCA jacks on the back. With variable audio out, the audio level at the audio output jacks follows the TV's volume control. If you go into the TV's menu and navigate to the audio page, look for fixed or variable output options. If you have the owner's manual, read the section on audio output. If variable output is not an option on your model, then the level is constant and the volume will have to be adjusted with the stereo's volume control.