Unbalanced vocals and instruments in audio output of Bluetooth sink example (A2DP)

[mohammed.benhadine]

Hey,
I have an issue with I2s config in the context of a Bluetooth speaker project based on ESP32 and PCM5100A (along with PAM8909 as Amplifier). This is my config :

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1. mode = I2S_MODE_MASTER | I2S_MODE_TX,
2. .sample_rate = 441000,        
3. .bits_per_sample = 32,        
4. .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
5. .communication_format =  I2S_COMM_FORMAT_STAND_MSB,
6. .dma_buf_count = 8,        
7. .dma_buf_len = 64,        
8. .intr_alloc_flags = 0,                            
9. .tx_desc_auto_clear = true

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I'm able to notice a great quality of audio output but only if the Mono source in my phone (Accessibility settings on Android) is activated along with audio baalance set to 100% right or 100% left.
If mono is desactivited along with audio balance set to 50% I feel the vocals very weak and overall experience is unbalanced .
What could be the root cause of this ?
Please find attached the wiring of the circuit