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Title says my question.
What's the difference between those?

Thanks

Thank you very much. One last question: Some people mentioned the left and right line-in on sub are usually bridged internally. It means there will be no difference between connecting to the left and...

Thanks. Does speaker wire connection any better comparing with that?

How about RM6800? It seems not powerful enough when I connected "sub pre-out" on receiver to left line-in on sub. Does Y splitter any help on that? Or any other better connection?

Got the replacement back and installed. humming goes away. I connected it on LEFT line-in to receiver's sub pre-out with RCA cable. The sub seems not as powerful as before. I have to roll the knob to...

Thanks for the reply. Will this resolve the both issues?

My RM6800 subwoofer which I purchased about two months ago has the following problems:
1. Humming, even without any audio cable connected
2. Auto-off fuature does not seem to work properly. When I...

My RM6800 which I purchased two months ago has the exactly same problem. What should I do? I'm in US.

Thanks Nebbrojk,
You are right on the connection. Initially I followed the Polk Recommended connections. But I got the unexpected result (strang sound like described here in the Troubleshooting...

Thank you!

Thanks for the reply.
1. Only a light hum noise. It goes away if unpluged.
2. As the photo you saw, there was no plastic covers. Where can I get it?

I have RM6800 and Onkyo TX-LR552 receiver. Here is my questions. Hope someone could answer them:
1. Subwoofer: I used recommended connections from RM6800 manual (Connect to speaker in on sub) and...

I have RM6800 and Onkyo TX-LR552 receiver. Here is my questions. Hope someone could answer them:
1. Subwoofer: I used recommended connections from RM6800 manual (Connect to speaker in on sub) and...

Could you please tell your solutions in detail? From what I understand,
- Use RCA cable with Y splitter to connect sub out from receiver to both L/R line-in on subwoofer
- Set X-over to the...