Integrated amplifier is softer on the Right channel compared to the Left channel, what....

Just curious what would be the cause or fix so do speak.
Probably around 3 - 4 db in difference.

I swapped the speaker cables on the amplifiers end and the its has changed, speakers on the right is now louder so....... problems should be with the amp until I try a new pair of speakers to confirm but pretty sure it the amp.

What could be the problem, amplifier is fairly new and could have been an existing problem that went unnoticed.