u/T1k1Punch

Hi
I’m a DJ playing old records in pubs on weekends.
In some pubs where I play, some records (usually Beatles) have say John and Ringo coming out if one speaker at one end of the pub, and George and Paul out of another
It’s quite annoying as ideally I’d like the whole sound out of each speaker.
Is there anything in my setup to fix this?
Bear in mind I can’t really measure with the house sound system where I plug the RCA master out from my mixer into.
Thx!