Your Onkyo has no suitable input for turntable. I suggest you to use this
preapmlifie, connect the turntable at the preamplifier input andthe preamplifier output at any available input at the Onkyo (cd, tapein or video in, at the red and white connectors). Of course you can buy any phono preamplifier from any shop and connect it with the same procedure. The models before is just a sugestion.
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