I just hooked up the epicenter, but it’s only outputting low muffled noise.

This is most likely caused by not sending a full frequency signal to the Epicenter®.

Did you connect the Epicenter to a dedicated sub channel?  If so, this might be your problem.

You need to send a full range signal to the Epicenter in order for it to perform optimally.

For more information on how the Epicenter works, please check out the Knowledge Base article here!