what is the right to put up a home theater speakers?

I have deided to buy a latest surround receiver for my home theater.Is it still good to use the speakers of my Component that has a 5.1 channel? or i need to buy a new one? Is there a big difference when im using the old one speakers compare to buy a new one speakers? I dont mind the expenses for the new one,all i need is to satisfy when we're watching movies together.

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