Hi, and welcome to DC!
My 440 Pros make a slight noise when they are turned on and off. First one speaker, then a split second later, the other one. I can hear this clearly from the listening position, but it’s not loud, and I’ve never worried about it.
I’ve never heard anyone complain of noise coming from a speaker when there is nothing playing though. In fact it’s the only amp I’ve ever owned that is completely silent in this respect.
Does it matter which input you are using when you hear this “back noise”?
If I understand correctly, both the 250 and the 120have the "back noise"?
This , I think, is highly unusual and I wonder whether it might have something to do with your power supply. Do you have a bad mains supply?
Does it make any difference to your overall sound quality, is the hiss audible when playing music? If the noise increases when you turn the volume up, then I would worry.
Are you living out in the sticks far away from the nearest mains transformer?
I hope you get it sorted out.
P.S. your English is very good. Better than some English people!
My 440 Pros make a slight noise when they are turned on and off. First one speaker, then a split second later, the other one. I can hear this clearly from the listening position, but it’s not loud, and I’ve never worried about it.
I’ve never heard anyone complain of noise coming from a speaker when there is nothing playing though. In fact it’s the only amp I’ve ever owned that is completely silent in this respect.
Does it matter which input you are using when you hear this “back noise”?
If I understand correctly, both the 250 and the 120have the "back noise"?
This , I think, is highly unusual and I wonder whether it might have something to do with your power supply. Do you have a bad mains supply?
Does it make any difference to your overall sound quality, is the hiss audible when playing music? If the noise increases when you turn the volume up, then I would worry.
Are you living out in the sticks far away from the nearest mains transformer?
I hope you get it sorted out.
P.S. your English is very good. Better than some English people!
Oppo BDP-105 - Roon lifetime - Dutch & Dutch 8c - Fiio R9
South Coast England
