I recently aquired some Sennheiser HD-595 headphones, which are very nice indeed. These are highly efficient and require little power to sound great. Now, what I've discovered is when I plug them into my Harman 3480 (with no music playing,dead quiet room) , I hear an electrical zzzzzzz sound in the background(the zzzzzz sound does not get louder when the volume is turned up). This is not a ground loop humm , which is common. I suspect it is the power supply , and I'm hearing a wave in the current. I've tried other Sennheiser headphones also, same sound, so it's not the phones.
A friend has a Denon 395 receiver, which when plugged into does not exhibit this sound.
I'm auditioning a Marantz PM-7001 integrated amp this week, and the first thing I heard when I plugged headphones in was the same zzzzzz sound, but to a lesser degree than the Harman.
So, I wonder if this is common to solid state amps or am I just experiencing some defective or less than stellar amps here ?
If anyone has some decent sensitive headphones , when you plug them in(quiet room, no music playing)do you hear anything in the background , or is it dead quiet?
I'd appreciate any feedback about this. I'd like to know if this is common or should I be looking elsewhere for an amp. Harman had sent me a replacement for the 3480, yet it exhibited the same sound. So, 0 for 2 from them. They apologize and tell me I shouldn't experience this ..... hmmm..... what to think .
Thanks for reading, Garth