Recently purchased a set of two brand new Polk TSx300T speakers to replace old set of broken Mission speakers. Receiver staid the same, Pioneer SX-253R. New speakers are sized and connected properly but right away I've noticed that one speaker is not performing the same as the other one. On under performing speaker bass is not the same and you can tell clearly when getting closer to the speakers. It is less and not deep toned as the other one. At the receiver side, I've tried to switch left-to-right as well as speakers A-to-B and the result is exactly the same. Definitely, one TSx300T is under performing and few people confirmed it. Took the mesh out and confirmed that both large membranes are oscillating. As there is nothing to adjust at the receiver side nor speaker, just wondering what should I do next. I hate going back to the shop and replacing items I've purchased. I would rather go for a test and adjust/repair if needed.
I am from Toronto in Canada. Any suggestions?