Thank you all for the advice and help. I have performed the isolation drill with no success. Next step is to physically move things to another room and or to a dedicated circuit.
Good listening.
Chris C
Good listening.
Chris C
McIntosh power issue
Hello,
Just recently, I’ve noticed when I power on my MC7300 and MC7150, there is the pop, the meters jump and then they hang around -50 to -48db on either amp instead of going back to their resting positions when no signal is being sent to them. Both are in the same room, same circuitry. There is no input being provided to these amps when they do this . I’ve also noticed that the meters do not begin to move while I’m sending signal to them from a C50 pre until the C50 is turned up some, around 27-30.
I’ve been searching for days on what might be causing this issue and all I get is marketing literature from Mc and explanations on how to interpret these meters.
The amps are also slightly humming, they may have before and I just didn’t notice but something is not normal. Really hoping it’s my power and not the amps.
Can some one please tell me what this means or help give me some ideas to search on?
Thank you very much,
Chris C
Just recently, I’ve noticed when I power on my MC7300 and MC7150, there is the pop, the meters jump and then they hang around -50 to -48db on either amp instead of going back to their resting positions when no signal is being sent to them. Both are in the same room, same circuitry. There is no input being provided to these amps when they do this . I’ve also noticed that the meters do not begin to move while I’m sending signal to them from a C50 pre until the C50 is turned up some, around 27-30.
I’ve been searching for days on what might be causing this issue and all I get is marketing literature from Mc and explanations on how to interpret these meters.
The amps are also slightly humming, they may have before and I just didn’t notice but something is not normal. Really hoping it’s my power and not the amps.
Can some one please tell me what this means or help give me some ideas to search on?
Thank you very much,
Chris C
4 responses Add your response
The amps are also slightly humming, they may have before and I just didn’t notice but something is not normal. Really hoping it’s my power and not the amps.If there DC present on your AC main, the Emotiva CMX-2 should be able to eliminating it. https://forum.audiogon.com/discussions/what-is-dc-offset-on-the-ac-power-line https://emotiva.com/collections/accessories/products/cmx-2 |
You say no input, but does that mean your C50 is on at zero gain? Should be on at zero gain and preferably a non-active source. If so, do the isolation drill by powering everything off, removing the ICs from the amps and turning just them on. If you still have the pop/hum issue, try different outlets in the house. Go so far as to move the amps to different rooms if you continue to have issues; there could be a device elsewhere in your house that's creating noise. If all of that doesn't seem to make any difference, you may have some kind of problem with the main house ground or sadly, with the amps themselves. No way to know that without getting the amps out of the house onto a completely different main circuit. Good luck! |