I did this test last night
With the Bryston powered up and connected to the speakers, without any inputs, there is a low-level hum/hiss from the tweeter and midrange of my speakers!
Also, now mind you this is a 19 year old amp, the transformers emit a fairly loud humming noise (audible out to 10 feet away) when plugged in, even with nothing connected!
I figured, from reading some posts, it's either a ground loop hum, or it's 60Hz hum from the AC line. My understanding is that a balanced or isolated power line may solve this problem. If a balanced transformer doesn't address line noise, then what the heck is it, good for nothing?
I've also decided to send the amp back to Bryston for service, but I'm not sure they'll agree with me that something's wrong with it! I'll have to see how that goes. The amp will be shipped out tomorrow or the next day...
Thanks for the input, everyone!
With the Bryston powered up and connected to the speakers, without any inputs, there is a low-level hum/hiss from the tweeter and midrange of my speakers!
Also, now mind you this is a 19 year old amp, the transformers emit a fairly loud humming noise (audible out to 10 feet away) when plugged in, even with nothing connected!
I figured, from reading some posts, it's either a ground loop hum, or it's 60Hz hum from the AC line. My understanding is that a balanced or isolated power line may solve this problem. If a balanced transformer doesn't address line noise, then what the heck is it, good for nothing?
I've also decided to send the amp back to Bryston for service, but I'm not sure they'll agree with me that something's wrong with it! I'll have to see how that goes. The amp will be shipped out tomorrow or the next day...
Thanks for the input, everyone!