But on the serious side, could it be one of the newer additions to the system, like a 2nd Muon Pro?
Didnāt the hums start when you added Grip P.? You have owned Apex for sometime and you have not heard hum (or didnāt notice) before?
Someone mentioned Puritan PSM156 has a DC blocker inside (donāt remember where I read it). You may try to plug Apex in it to see if the hums will stop. This is not a permanent solution because of your feeling about Puritan, but itās worth a try.
3 Likes
I donāt think a Muon Pro, or a second one, could affect house current or a transformer as they are passive devices and do not plug into anything. DC blocking might be the only cure, like Donald is suggesting. Al will figure it out.
2 Likes
2nd internet source causing a loop?
Has to be a recent change
At one time I thought it was associated with the GP. But as you know, I am a confused and silly person. I made some changes tonight and now the subs warble with no music playing. Only an Exorcist can save me now.
I am listening to Brubeck - Time Out on CD right now. I am pleased as punch with whatever is happening right now. Iāll get back to wrecking my system tomorrow.
Update: I powered off the subs. Nice change!
Both the Subs and the Amp are on the same circuit. I tried them on different circuit. That might have been better.
Hope!
4 Likes
The Gods must be appeased!. My system is much more simple than yours. However in having fun with amps over the last few months (T+A, Hegel, BAT and Levinson) everybody likes to hum at some point.
Big hum, little hum, high level, low level. Ground floated, ground at chassis.
The BAT refused to do high level. Everybody else seemed to get the picture after enough monkeying around.
I am confident you and Brubeck will figure it out.But easy for me to say. Ive been simplifying latley. Aurender-DAC-Integrated. I need to find the right dac (dont we all) but as of today no hum.
Have you checked for DC on the line?
The Endless Journey, finding the one true DAC.
I think I may try running a ground cable from the subs to my amp. The thing that may stop me is my amp is a differential design. My REL subs seem happiest when using the high level input. So each sub just hooks up to the positive of each channel. The negative connection is unused. I believe if I run a ground between the Sub and the Amp that could be bad and wrong. I am certain it is wrong. Never mind.
Sub off seems easier.
The thing that bugs me is I didnāt have any of these problems a couple of months ago. The only thing I can look at as a possible suspect, is Karma.
1 Like
How would one do that?
And as I sit here thinking about this, isnāt there a bias switch on the amp? If so, does the degree of bias affect the hum?
2 Likes
Google DC testers.
3 Likes
I will trust you on this one. I ordered two of them. I hope they solve this!
The transformers in the Apex are the size of microwave ovens. When I plugged the amp into a P20, powering it up would shutdown the P20 immediately. Lots of capacitance too.
When I use my favorite $120 IEMs with my phone, none of this schitt happens.
1 Like
Take a look at the Fluke mutlimeters. For example, the T6-1000. Set the control to DC voltageāthe symbol V with a straight line over it. If it reads a voltage, call your power company.
I found the problem:
One of the 5 20 amp circuits tested bad, Neutral reversed. I was using it to feed half my PowerZone.
I tested two others and they were fine. Amp still hums. Subwoofer noise gone. Sigh
I may have switched to the bad circuit in a fey moment. Now I have to figure out how to cancel an Emotive order. Ooops, maybe I still need them. I am going to sleep.
10 Likes
Good news. Buy a multimeter anyway. Good to have.
5 Likes
I have two. Set it to DC and stick it on the sockets?
Al, please do not try this! With an amp that has differential (floating) output, grounding it to a REL while using the high level connection could / may blow the amp outputs. Do not do this! Pass monos are also differential out, and I spent quite a bit of time researching the dos and donāts before hooking up my REL. If you have dual outputs on your amps, you can hook up the red and yellow REL wires (but not the black!) - one to each positive terminal. Itāll work fine and may help with some of your issues (assuming itās not all due to that reversed outlet).
6 Likes
Happy Cake Day Tony!
1 Like
Thanks Al!
2 Likes
Yes. Line to neutral, then line to ground, then neutral to ground. Be careful!
3 Likes