Hi Richard

>>The ground connection is required for the passive module. But it could
>>be done also via the connection of the active module (This was not
>>described in Dieters instruction).
> This ground connection is common to the front panel too

No, the frontpanel is not intended to be used as ground connection
(though it is connected to ground usually). You should not rely on.


Florian


BTW: In theory the housing of audio equipment should be separated
completely from the electrical audio ground.