I'm at a loss as to why anyone would want to hook that up. Most receivers have integrated equalizers and a fairly robust set of controls for the LFE output and the high pass for most devices connected to it.
It seems like that is a much more powerful tool when you don't have a decent A/V receiver... I'm not sure at all where you would use it, but I guess it would need to be on the LFE output before the subwoofer.