2. amps-preamps
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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

Showing 3 responses by kudelka8

kudelka8
34 posts
 
Back to tom 8899

apology accepted. Same point — the noise with my lumin stopped completely when I added a passive pre-amp to my system. 
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.
kudelka8
34 posts
 
Back to tom8999

I solved my noise-with-lumin issue. Have you?
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