Question about Definitive BP7004 Main / Stereo Speaker

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Sub not working

I have a pair of definitive technologies 7004's for my left and right speakers. I just bought them from a guy on craigslist. He says he had no problem with the sub's.
I'm not using the optional LFE input on my pair of mains. My reciever has my mains set to large, and sub is set to none. One sub works in one tower and not the other.
When I plug the bad tower into the wall, i can hear the amp 'pop' like the DT site says is normal. the red light is on, on the back, which signals the amp is on. however the sub doesnt ever activate. no vibrations. If i take my other 7004 and swap it in place, using the same speaker connection and electrical socket, the sub works fine.
This tells me the amp is ok? but something else is messed up? How do I troubleshoot this? I'm afraid to unscrew the back plate and mess something up.
when I transported them in my car on the way home I had the speakers resting on their backs. I was afraid to rest them on their sides since they have speakers on the sides.
On the back of this tower the level knob axle was a little bent. meaning when you turned the knob it wobbled a little. I bent it back straight and it feels like it funcitons just like the other tower. the knob is still turning something in there. it doesnt 'feel' broken.
any help would be greatly appreciated!
Thanks
Rob

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SOURCE: placement of definitive supercube 2

Make shure your crossover on the amp is set at 80hz. If closer to side walls you will get more response but may be muddy. Make sure it goes low enough to comliment the klipchs.
GOOD LUCK
BIGRED

Posted on Apr 11, 2008

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