I had a 518 going into a 565,but mine had the dts 7.1 installed. There is a Meridian user site called something like "hitchhiker guide to Meridian" That may not be the exact add, but it is something like that. I sold my 518 because of space consideration;and I didn't think it improved things all that much. After all it is just a digital filter device and as I remember you couldn't do input switching. It's been a while I hope the switching thing wasn't my error on hookup.
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