Right speakers not working?

When I connect my iPhone to the surround sound consisting of 9 in ceiling front speakers, 2 surround speakers and 1 center just the left speakers work. When I connect the sound system to the tv all speakers work properly. But when my phone is connected to BT audio just one side of speakers work. Note that I use YouTube. Also the same thing with my car audio BT

If your iPhone's audio settings are improperly configured, you'll likely hear one-sided playback. Turn off mono audio from the "Accessibility settings" to allow a left and right playback. With mono audio, all the sound signals, both left and right are mixed into one signal and routed through one channel (speaker). If this mode is enabled, you'll only hear sound on one side of the headset. After adjusting this setting, increase the volume by pressing the volume button on the left side of your phone.

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