Hi all !
I'am working as Sound Manager in a french room
Actually solving a problem with our 60 channels passive transformer isolated microphone splitter.
This spliter box contain 15 x 4 channels SommerCable Modules likes This :
Generally we use it like
Direct out for the Mnt Desk witch feed in Phantom Power
Iso Out 1 for the Foh Desk
Iso Out 2 for the Brocasting or Reccord Desks
The problem is a hum sound and the poor quality passing thru this modules :
About the quality question :
SommerCable supply this 4 channels modules with two options around the transformer
No Name SommerCable Or Lundhal 1570
With have the "no name" version ... of course // i hope to get the budget to buy individually 60 x Lundhal 1570
Regarding the 2 two transformers tech spec they are big differences :
Please see in link this two tech specs :
https://drive.google.com/open?id=0BwGGieYb0SNwM0c2Wk5FWnVVLTQ
About the Hum Sound question :
When i hear this sound, i think about explorating the ground wiring topic
I don't have any problem between the input and the direct out (logic isn't it ?)
All the wiring in input and output is in common ground ... i can't change it
It's in harting connectors 20 pairs with common global ground like this :
This is the schematic simplified by only one channel of the module :
What is exactly the goal of all this caps and resistors ?
What about the grounding management ?
After reading some splitter literature i'm a bit perplex about this schematic
Please read in link this 3 documents :
https://drive.google.com/folderview?id=0BwGGieYb0SNwaFJpNzVTTFctSWM&usp=sharing
What about the Step-down mode ?
--------------------------------------------------------------------------------------------------------------------
Can i do this ? :
I'am working as Sound Manager in a french room
Actually solving a problem with our 60 channels passive transformer isolated microphone splitter.
This spliter box contain 15 x 4 channels SommerCable Modules likes This :
Generally we use it like
Direct out for the Mnt Desk witch feed in Phantom Power
Iso Out 1 for the Foh Desk
Iso Out 2 for the Brocasting or Reccord Desks
The problem is a hum sound and the poor quality passing thru this modules :
About the quality question :
SommerCable supply this 4 channels modules with two options around the transformer
No Name SommerCable Or Lundhal 1570
With have the "no name" version ... of course // i hope to get the budget to buy individually 60 x Lundhal 1570
Regarding the 2 two transformers tech spec they are big differences :
Please see in link this two tech specs :
https://drive.google.com/open?id=0BwGGieYb0SNwM0c2Wk5FWnVVLTQ
About the Hum Sound question :
When i hear this sound, i think about explorating the ground wiring topic
I don't have any problem between the input and the direct out (logic isn't it ?)
All the wiring in input and output is in common ground ... i can't change it
It's in harting connectors 20 pairs with common global ground like this :
This is the schematic simplified by only one channel of the module :
What is exactly the goal of all this caps and resistors ?
What about the grounding management ?
After reading some splitter literature i'm a bit perplex about this schematic
Please read in link this 3 documents :
https://drive.google.com/folderview?id=0BwGGieYb0SNwaFJpNzVTTFctSWM&usp=sharing
What about the Step-down mode ?
--------------------------------------------------------------------------------------------------------------------
Can i do this ? :