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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Pro AV Forum => Topic started by: Jeff Whitehouse on February 05, 2020, 01:09:41 am

Title: Gate Setting
Post by: Jeff Whitehouse on February 05, 2020, 01:09:41 am
We just got an Allen and Heath Q24 mixer for our venue. It wasn't too hard to figure out how things work without the manual, however, there is something about the gate setting that has me wondering what is happening. When the gate is disengaged there is a bit of a white noise(lack of a better term) detected. The graphic shows the signal reaching about 30 db before the audio opens the gate. 
My guess is that If I were to engage the gate and set the db level to about 50 it would get rid of the brief but sudden white noise.
Does this sound correct?
Also, does any one know if the Q24 default gate setting is always running in the background when disengaged?
Title: Re: Gate Setting
Post by: Jean-Pierre Coetzee on February 07, 2020, 04:48:58 am
I noticed that the gate seems to be always running even if disengaged. Now for the other question...

Can you clarify what you mean by a bit of white noise? If there is no mic plugged in then yes the pre-amp will have some residual noise on it and if you push the gain enough then it will likely get high enough to open up the gate. Simply try turning down the gain.

IF the issue is that the console is generating noise that is audible when the gate is disengaged for a few seconds then likely you need to update firmware or contact A&H support since that seems like a fault on the console.
Title: Re: Gate Setting
Post by: Mike Caldwell on February 07, 2020, 06:13:14 pm
Out of the box the gates are bypassed, you can see them reacting on the grayed out screen.

What is the input on that channel, if it is noisy maybe look first at the cause of the noise.

As Jean said even an open mic channel with the gain cranked will put out noise.
If you turn the channel gain down does the noise go away.

If you do need to gate that channel just to hide the noise first set the gain on that channel
as needed for the source input and then with the gate find the minimum threshold that will close the gate, set it for a fast attack time, a little bit of hold time and slower release time, set the gate depth just low enough the noise is gone. That will help make it sound more natural rather than the gate slamming  open and closed.

Title: Re: Gate Setting
Post by: Tim McCulloch on February 14, 2020, 03:40:28 pm
Drive-by post.  OP logged in 12 hours after his original post and has not returned...