Can anyone tell me whether I can use speakers of a home theater system to hook up with regular receivers?

Speakers plus dvd player in a package like Pioneer HTS-950NXT – Home theater system cost less than a pair of good quality speakers. I have good main speakers. Just want to have speakers as Presence speakers for a Yamama system and want an extra subwoofer as an add-on to the main speaker and two surround speakers or surround back speakers. Thx

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