So my bedside setup had been a Mac mini, topping dx3, and a little topping headphone amp, all running unbalanced. but I started getting a low-level hum that disappeared if I touched a case or unplugged the Mac mini. I ruled out the USB connection. The Mac mini was a 2012.
In the course of troubleshooting, the old Mac mini got much worse! Really loud buzzing. So I threw that shit away and got a new, dinky Mac mini. Pretty cool.
Low-level hum persists. So I pull out a Topping DX7 combo DAC/amp that had been mothballed owing intermittent weird screeching in the signal. No more hum. Since it's defective, I'm using it until my new Topping DX5 combo unit arrives. No idea what to do with the DX7 -- obviously I can't sell it to anyone.
Over the years, I've had these problems crop up, and I usually just ditch a setup and replace stuff until things work again. But I suppose the DX5 will break in a year or two, and I'll be back to square one. Sigh.
In the course of troubleshooting, the old Mac mini got much worse! Really loud buzzing. So I threw that shit away and got a new, dinky Mac mini. Pretty cool.
Low-level hum persists. So I pull out a Topping DX7 combo DAC/amp that had been mothballed owing intermittent weird screeching in the signal. No more hum. Since it's defective, I'm using it until my new Topping DX5 combo unit arrives. No idea what to do with the DX7 -- obviously I can't sell it to anyone.
Over the years, I've had these problems crop up, and I usually just ditch a setup and replace stuff until things work again. But I suppose the DX5 will break in a year or two, and I'll be back to square one. Sigh.