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Just upgraded my Integrated Amp - now here a HUM out of my LUMIN - HELP

I run two systems in my home - System one is in my family room - my old Krell 400 xi died last month. I replaced it with the new Krell Integrated amp the K300i - Everything is better - soundstage is larger - highs are clearer with no harshness, bass is amazing, and midrange vocals are so real Carly Simon vocals bring me to tears! My problem is I now have a very low level pulsating hum between tracks that I cannot eliminated. I have isolated this hum to my LUMIN when i input its feed into the Krell. The low level hum follows the RCA jacks as I move them from inputs S1 to S2 to S3 on the Krell. My DVD / CD player on this system does not have this issue - it is stone silent between tracks. The only ‘odd thing’ about my LUMIN RCA inputs is they are long - 15 feet. I have my LUMIN upstairs feeding my second system via the balanced outputs. This system runs with my older Krell S550i integrated amp. The sound is stone quiet between tracks - no HUM.

i am running the Krell K300i at a volume output of 65 ( volume runs from 0 to 100). I then control my actual volume via my I pad mini via the LUMIN app. My sound is amazing , but this HUM just bothers me. Do I need to ground the LUMIN D1? Both systems get their power via two separate FURMAN ELITE 15 Power Conditioners. I am out of options. Any help would be appreciated
tom8999
tom8999 OP
151 posts
 
Thanks for the additional input - my hum is weird now - it is very faint but it rises and falls when I am not playing music out of the LUMIN, and I have to crank up the Krell and put my ear on the speaker to hear it. So I guess I have interference hum. I am rerouting my cables to get them away from the AC input cables behind all of my equipment. For me the ‘Tell’ here is that I have minimized the HUM over the last days by upgrading my original RCA interconnect to the Anticable 2.2. I just used an extension cord to move my AC input into my Furman to another outlet - trying to find another circuit.  I will let you know how this adventure works out. I guess my new Integrated Amp is ‘sensitive’. I am just glad I upgraded to the new RCA interconnect from Anticables - I am hearing ‘new detail’ in multiple albums via my LUMIN.

again thanks for the education!

kudelka8
34 posts
 
A hum you’ve got? When I installed my LUMIN s1, I heard a Chinese radio station. (I’m in Canada, so it could have been a local station.) I contacted the Asian distributor, and they were totally perplexed. Meanwhile the radio signal got louder and louder, first through the right channel, then through the both. Got louder and louder.till it almost drowned out the music I was playing through my system. No fun at all. 
My amps are a pair of coincident technology monoblocks. Cables are all shielded.  Never happened to my system before, through all its 30 years of configurations. 
Solution I found was to add a passive  pre to my system.  Like, the one I kept stored  in the basement and hadn’t used in 15 years. Actually forgot I still had it. Specifically, it was a Placete RVC. Plugged that in  and shut off the volume control function on the LUMIN. And went back to using the placete for volume control. That solved everything, don’t know why, I’m not technically minded,but it did.
tom8999 OP
151 posts
 
ieales - my LUMIN cannot come downstairs as my System 1 does not have Ethernet connection available in the family room. This is why the Lumin is upstairs - I have an Ethernet connection in the wall right behind the stereo system upstairs. Plus I am not an electrician and I do not want to short anything out.
tom8999 OP
151 posts
 
Kudelka8 - please go waste your time elsewhere.
edcyn
1,876 posts
 
I'm lucky to have found this thread.  I have a hum/radio station interference issue that that only occurs when I use my Mytek Brooklyn Bridge as a phono input for my Lyra Delos.  The high gain MC choice, of course, is noisier than the low gain MM choice, but both get that damn MOR radio station.  To be sure, the interference is quiet enough not to bug me when I'm actually playing music but still... My dedicated Moon LP3 phono stage, by contrast, is absolutely interference free. The thing is, I'm beginning to prefer the Mytek's sound more than the Moon's.  What's an audiophile to do?  I know!  Spend more money!
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