Hey Guys, So I have tried a few things and I definitly have a bad speaker. First I swapped the speakers to th opposite sides and sure enough the lower volume was on the other side now. So I put them back and opened my DAW and duplicated a drum track and panned it to opposite sides, taking in turns to solo each one and by doing this it was very clear that one speaker is a lot quieter.

So i'll ring the store that I bought them from in the morning and hopefully get them swapped for a new pair. I just hope that because I have had them 16 days it doesn't affect my rights. Thanks for the help guys