I have two of them gathering dust. There is no question about them brightening up the sound. I have one hooked up to my KN7000 and I can tell the difference. Whether or not anyone else can is a different question. I guess it's one more piece to carry and hook up.
My Audya doesn't need it at all.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact