Maybe.

Uhhhhh...

OK.

The crossover in the receiver refers to removing frequencies below a certain level for the regular speakers, right? Now, the high pass filter in the receiver removes frequencies above a certain level for the sub. You want to set that at the same level or higher than the highest crossover level (probably your surrounds). That way you're fully covered, and there's not a lot of doubling.

I am the Doctor, and THIS... is my SPOON!