If your receiver will let you, you might want to try rolling off the Encores a bit lower , woth trying. If I recall, they are naturally -3 db at around 50Hz
Don't see why you couldn't pick up one of the inexpensive plate amps from PE and use it for you Paradigm. Then just hook it up to the LFE as you would normally and away you go
You could pretty much get away with any amp using the c/o and gain setting on the receiver. If you've already got something or have access to something, give it a try
jay