home theater system want to run outdoor speakers. The receiver only has the 6 outputs. How do I do this?

I have two 5 1/4" 3 WAY 150 watt outdoor speakers to install. the wire lenght will be about 50 feet per speaker. The home theater system is a Pioneer with a wireless out that says you can only use it with their equipment. they are AV jacks. Could I use some type of amp off these AV outs? or just parallel off one of the surround sound sets? Limited on funds so just something that will work. thanks j

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