I need an Audio Detective


Hello AG I have a unique situation with my audio system that I have no answer for. Here’s the deal. I was playing my Magnum Dynalab tuner and noticed my Denafrips Terminator 2 DAC standby light was not on. The power cord had come loose from the back so I snugged it up and the light came on. For whatever reason I hit the on button on the DAC and when I did it crushed the signal on my tuner. I cut DAC off and signal came back. I tried another tuner same result. Any ideas as to what is going on?

128x128jr96aolcom

Sounds like RF interference. 

I want to point out though that this isn't much of a problem unless you like to keep your gear warmed up.  Distance, shielded interconnects and shielded power cables are the usual solutions.

DAC and Magnum Dynalab are about a foot apart, both plugged into a PS Audio P12. The second tuner that I had the same thing happen is 4 feet away and is on a Furman power conditioner. Balanced on both Magnum and DAC unbalanced or second tuner which is a Mcintosh MR71

Erik you are right it really isn’t a problem because I don’t keep the DAC on but you will have to admit this is a head scratcher

@jr96aolcom

Is this the first time this has ever happened when both units were powered up, and you were listening to the tuner? Or have you never had a reason to power up the DAC before, when listening to your tuner?

It sounds like the DAC is emitting some RFI which is getting into the tuner circuitry. The question is, how is the DAC emitting this RFI; via audio interconnects, or AC cable? Is the RFI energy entering the tuner circuitry by each chassis being so close together? 

If I really want low noise FM reception, I have to turn off all LED lighting in my house. Most LED lighting and dimmers emit RFI which reaches into the FM and AM bands.

Antenna is on the roof. I have 4 tuners with a quick disconnect I have set up so I don’t weaken my signal by having all 4 on a splitter. I only have 1 at a time. I am beginning to believe it is an RF issue being picked up by cabling. I am going to try this with my other 2 tuners tonight to see if the same thing happens