I was and still am using XLR IC’s. I only ran RCA interconnects for the above test, and it still does not answer my initial question.
Yes I understood you were going to use XLR ICs. I just don’t remember reading in one of your previous posts you had bought the longer cables yet.
Even now with my ADCOM on the floor and longer XLR cables with plenty of room between the two components there is the dreaded hum.
With absolutely nothing connected to any of the inputs on the Marantz? The only two components powered up is the Marantz and the Adcom? And you have the hum?
That just doesn’t make any sense......
.
Just grabbing at straws, what mode do you have the Marantz set to?
Try setting the mode to stereo. Just the front right and left channels.
Did you try my test using only one pair of XLR cables connected to the front/main right and left channels only? Baby steps first.
.
.
Al,
For what’s it worth the Marantz balanced output XRL male connector pin out is,
Looking at the connector
Upper left pin #1 (ground)
Upper right pin #2 (Hot +)
Bottom center pin #3 (cold -)
Polarity probably is reversed with respect to the Adcom, but that wouldn’t/shouldn’t case a hum/buzz problem. Correct?
I can’t believe the Marantz would be outputting any DC. If it is where would you measure it, from what pin to what pin? Would even the smallest amount of DC cause a hum on an input of a 300 watt power amp?
There can’t be any AC difference of potential, voltage, (ground loop) from the chassis of the Marantz to the chassis of the Adcom. The Marantz uses a 2 wire cord and plug. AC wiring inside is double insulated. Unless the Marantz has a power transformer with an above normal primary to secondary coupling capacitance. Not sure that would even do it. If jo3533 disconnected all ICs between the Marantz and Adcom, powered up both units, and then checked with an AC volt meter for an AC voltage from one chassis to the other chassis he should measure zero AC volts, Correct?
Jim
http://us.marantz.com/us/products/pages/ProductDetails.aspx?CatId=avseparates&ProductId=AV8801