Class d noise rejection


Recently I had the opportunity to try out some really expensive audio equipment that was class d. I currently run a typical big ass amp with a large linear power supply. I have very nice cables and power management. The system is dead silent. Now the twist. We are older and use a ringer pemf unit to treat different conditions. We may lay in it while watching tv etc through the stereo. Everything is dead silent while using the machine. When the class d amp was put into the system, the pulse from the pemf until pops through the amp producing a pop through the speakers. This totally leads me to believe that class d amplification is poor at best for spurious noise rejection. I also really did not care for the sound quality near as much as linear power supply amps. I felt the same way when I tried magnetic field amps back in the 90’s. Has anyone had these type of experiences? Regards, Greg 

gregp858

No, really trying to understand the topology, so brand is irrelevant. As stated, a totally not normal situation that just wanted input from someone far more familiar with the technology.

Why omit the name of the brand of the class D amp?  Was it Aavik or something like that?

To the moderator, please remove this thread. I’m not conveying what I was looking for properly and this is going to cause an irrelevant discussion 

Greg,

Really wish people would not make such broad blanket statements about amplifier classes based on single samples of unnamed equipment and a rather weird circumstance.

The wide variety of Class D amplifiers, and their power supplies, as well as the variety of linear amps really should not encourage this kind of argument.

I have a Luxman integrated. Sometimes when I turn my ceiling fan off I can hear a small pop through the speakers. Should this put me off all integrated amps?

Of course not.

If linear amps were immune to noise audiophiles wouldn’t be plunking down tens of thousands of dollars on power cables, boutique conditioners and putting new power meters on the outside of their homes to isolate them. 🤣

I also find it interesting how often extremely non-specific, Class D  bashing posts show up on Audiogon.