RS 520 Left Right Sound Balance

I have an RS520.
A really dumb question but I can’t figure it out.
The right channel is louder than the left.
How simple.
Just adjust the balance control.
I can’t find it.
Where is it?

StandardModel

@StandardModel

We apologize for any inconvenience caused.

If you change the left and right channels and the sound comes out louder in the left channel, contact the distributor in the country where you purchased the RS520 and request repairs.