Subwoofer output

I have a HK 3385 receiver with a line-level subwoofer jack. There is no mention of a Xover in the receiver. Do I need a subwoofer with a Xover?
The receiver will only pass bass through the subwoofer out.
You do need a powered sub with frequency and level controls to properly blend it with your other speakers. You don't need an external crossover.
If it's line level output don't I need a powered subwoofer?
Please disregard my previous post.
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The Outlaw is on my list, but the HK will do for now.