Ace bass addon

I got the idea because I saw a modified NAD that contained ACE Bass.
I figured it doesn't go for push pull amps.
What features are required for operation?
Being able to hook it up to a normal amp would be fantastic because it would allow it to be used in a speaker with a stereo amp using one channel for the bass and one for the rest. Obviously I know that an ACE Bass woofer must be clipped to 250Hz max.