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Author Topic: Studer 900 - Low end hum with VCA fader modules - Help needed  (Read 1428 times)

Offline ilcaccillo

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Studer 900 - Low end hum with VCA fader modules - Help needed
« on: February 02, 2016, 10:49:04 pm »
Hello,
I'm working in a studio that has a Studer 900 20 channel console.

The console came with normal faders modules and also VCA fader modules with built in compressor. Both of the fader modules could be installed as choice.

The problem is that with the VCA Faders installed there was a huge low end hum introduced in all the console outputs.
With the normal fader modules there was no noise at all.
So at the time with bands booked in to record the only solution was to use those faders.

We would like to have the VCA faders installed and knowing why the desk hums with them. I did some tests and if only one VCA fader is installed in the desk no hum occurs (it can be installed in any channel doesn't make a difference) if a second VCA fader module is installed on any channel then the Low end hum occurs.

Maybe it's a know problem in this desks, maybe there's something that needs to be changed in order for the VCA faders to work properly.

Your help is highly appreciated.

Online Fletcher

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Re: Studer 900 - Low end hum with VCA fader modules - Help needed
« Reply #1 on: February 03, 2016, 02:20:45 pm »
Sounds like a grounding issue... if you know a tech who understands grounding, that would be the first thing I'd have checked.

Peace
CN Fletcher

mwagener wrote on Sat, 11 September 2004 14:33
We are selling emotions, there are no emotions in a grid


"Recording engineers are an arrogant bunch
If you've spent most of your life with a few thousand dollars worth of musicians in the studio, making a decision every second and a half... and you and  they are going to have to live with it for the rest of your lives, you'll get pretty arrogant too.  It takes a certain amount of balls to do that... something around three"
Malcolm Chisholm

Online mbrebes

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Re: Studer 900 - Low end hum with VCA fader modules - Help needed
« Reply #2 on: February 04, 2016, 09:57:14 am »
Agree with Fletcher, it is a grounding issue.  Not familiar with the board, but the standard faders are probably passive while the VCA faders would need to have active circuitry and would be more prone to grounding issues.