How can I connect a second sub-woofer to a home theatre without burning the system out?

I am going to get a Samsung 1000w home theater and my friend has an extra subwoofer he is willing to let me borrow. What can i do so it wont burn out the system when i connect it?

Home Theater Projectors – Keep That Lamp Burning

Increasingly, consumers who want to experience cinema-like viewing in their home opt for a home theater projector. These devices allow users to view their entertainment in a darkened room without the size restrictions of a television screen. However, as most owners will attest to, there is a somewhat significant maintenance expense associated with this [...]