I have the 557 and 502. When I went to Balanced connectors I used the shorter plugs which eliminated the Buzz sound of not using them. I went to Delta Labs Siver interconnects with Great results. Very Quiet indeed!! Nothing to compare them with other than my JPS RCA interconnects.Also have the 508.24 CD Player.Your slight hum can be from anything. I'm using a ByBee Signature line conditioner and upgraded Power cords throughout the system with hospital grade power outlet.
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