Hum issue with Icepower

olivier

VIP/Donor
Nov 27, 2016
42
30
225
Munich
www.olivier-schmidt.com
Dear all,
a new M2TEch Crosby is in the house and i am wondering why there is a hum through the speakers when connected to the MX 150.
There is no difference if connected balanced or unbalanced.
With another Pre (Doge 9) there is no hum.
With a Hypex am or any other amp there is no hum connected to MX 150.
I thought like it could be the switching power supply of the M2Tech but it is onboard of the Icepower i think,
Any ideas?
Thanks
olivier
 

Kingrex

Well-Known Member
Feb 4, 2019
317
161
50
Is rhe MX 150 a Mcintosh preamp. Different manufacturer of amp and preamp. Seems like a mismatch.
 

Kingrex

Well-Known Member
Feb 4, 2019
317
161
50
If its all quiet in other configuratuons, its not faults in individual components. Do you have the output impedance of rhe Mc and input of the M2. What are they.

I can't answer these type questions but others can tell from those numbers if it will work together. Someone may even know how to change one or the other or how to make them communicate better.
 

Kingrex

Well-Known Member
Feb 4, 2019
317
161
50
Is there a voltage difference? In the signal. Im not an engineer. I don't know what im talking about, but I would assume voltage would need to be the same.

Also power cords. Same circuit in wall for amp and preamp.

I actually have a more quiet system by amps on one receptacle and branch and front end on another receptacle and brance. Of course both same phase. Much more quiet. Equipment can inject noise onto power. Having 30 feet of wire between them helps.

Check for a ground issue. Move the plugs around to different receptacles. Even non audio. And change cables. On both. Disconnect all other gear. Pull the power cords and interconnect and or ether/coax. You know what I mean. Isolate the amp, preamp and speaker.

Good luck
 

olivier

VIP/Donor
Nov 27, 2016
42
30
225
Munich
www.olivier-schmidt.com
Maybe it´s a voltage difference, cause when i unplug the unbalance connection the hum is gone...
But it is really strange that this only happens with this combination. With same setup but another amp or another preamp there is no hum
 

Kingrex

Well-Known Member
Feb 4, 2019
317
161
50
I don't have anything else. Im not a tech or engineer. It does not sound like a gear problem. It sounds like a mismatch for some reason.
 

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