You will want to send a full range signal to the Epicenter®.
Due to how the Epicenter creates the low frequencies, it needs to see a full range signal.
If you just send the Epicenter a subwoofer signal, say 120 hz and below, it will probably sound garbled, or muffled, not very defined.
For more information on how the Epicenter works, please check out the Knowledge Base article “How does the Epicenter work?”
Epicenter product pages here