How do I adjust Homepod stereo balance?

I have a stereo pair of Homepods set up in a normal Hi-Fi set up; that is I sit between the speakers and the speakers and I are in a triangle. - music volume is clearly unbalanced - a centre sound is louder on the right speaker. - I physically swapped the speakers several times to rule out a hardware issue. - My room is not symmetrical - I have tinnitus in my left ear so sound should adjust for this disablement. How do I configure things so that central sounds sound from the middle to me? I play music either directly from Apple Music on Homepods or select Airplay on my iPad.