Decent Sub for the money,but the buzzing is definitely annoying

I'm on the fence on this subwoofer. I think the output could be there, but I have not found the best placement yet. The same place my previous subs were placed don't appear to be the best spot for these. I also have the notorious buzz that is claimed to be a ground loop, but my previous subs in the same plugins do not exhibit any of this noise. I have tried virtually every plug in the house and it does not change the buzz. I'm going to contribute this to poor amplifier design or components because it does it all by itself with nothing but the power cord. It is more noticeable when watching movies and there is not a lot of of low frequencies. I have not contacted support yet and not sure if I should because I'm not sure if the replacements would be any better. For those wondering it has plenty of output below 50hz if you get it setup right.