Post and Click stm2448

[winger]

I am using a stm2448 for live mixing. I was getting pops, clicks snaps etc out of the right channel of the system. The noise would show up in the output meters of the 2448 but would show up no where else. I was soloing individual channels to try identify the source but could not. Even with all channels muted I would get the noise.

I am using Behringer ada8000 pre-amps to adat in for all inputs and outputs. I had a stereo channel attached to a stereo wav device for media player for break music but this we muted as well.

The only other thing is a reverb device and a delay device attached to returns. But even with the returns zeroed I would get the noise.

I am using a pulsar II and Pulsar I and and stdm cable between them. All channel in is adat optical and I was using 1 midi in/out to connect a yamaha promix 01 for a controller.

This is the same system in which I reported the 2448 giving me connection problems when I try to add another pulsar I card.

Other than these annoying pops, it works flawlessly.

Any ideas anyone?

[ReD_MuZe]

in my experience is probably a faulty stdm connection.

try tucking in your cards, and stdm cables.

if you are using ADAT make sure your Master/Slave settings are correct

[garyb]

are the ada8000s set to "adat slave"?

there can only be one digital clock master.

[winger]

all the ada 8000s are set to slaves. You can see the noise spikes on the output meters of the 2448, but not on any inputs. Also, no input channels were panned hard right or left, so getting the noise from the 2448 right channel only implies to me the noise is being generated internally from the 2448 right channel for some reason.

[Neutron]

can you load a new project with a brand new instance of the mixer and see if it still happens?
or save as a different project name, and gradually disconnect every input to the mixer just to be sure that one of your inputs isnt causing it (even when zeroed, it is behringer after all )

i use that mixer all the time and heve never had a problem like that.

[winger]

The problem is this was in a live environment. I did not have the option of reloading projects to see if the problem would go away. I was stuck with what I could do without interrupting the currently performing band. I have used this configuration before and if the problem occurred it was too infrequent to notice. I was getting 4-6 pops per minute and irregular times sometimes a couple seconds appart, sometimes I would a few minutes without any pops.

The problem did not seem to start until 3 or 4 hours after power up. It was outdoors, the temperature was about 85 degress F and we were in the shade. Heat could have been a factor I suppose though it was this is only about 10 degrees warmer than previous indoor events which did not seem to have the problem.

[garyb]

bad AC power? generators?

[ReD_MuZe]

heat is usualy not much of a problem outdoors. the real killer is humidity. especialy smoke machines...
these would render any tool useless including my cello.

[dawman]

I betcha you had dimmer packs 'eh? Even if you didn't, when performing outdoors, especially where generators and ganging of household adapters are used it is like a ghost.

I use OSHA plugs and always make sure to have my SurgeX rack when any dimmer packs are used, as the flucuation in wattage reaked havoc on my first DAW onstage.

But if you were just ganging together tons of AC lines a regular Furman conditioner will work just fine. Scope isn't very finnicky about line conditioning or surge protection until live amps, lights, and other stage related gear are concerned.

Olive from DAS has had lots of experience using Scope live w/ wireless mics. and monitors, and other hardware also, and helped explain some troubles I had w/ Sennheiser mics a while back. Maybe he could also offer some suggestions, as we encourage live usage of Scope for all who crave good sound at a fraction of the cost of hardware.


Ankyu.

[winger]

No generators. All my digital devices (the computer containing the pulsars, and a dbx drive rack pa) were on a battery backup power conditioner. Even still I had suspicions of noisy power until I realized the noise originated within the 2448 and was not being introdcude from an analog source. The noise was only present in the main output right channel originating in the 2448. I had 5 auxes in use, 4 for monitors and 1 for effects loop and never seemed to get any of these pops from any of them. If it was power I would expect the noise in everything not isolated to a single output.

[garyb]

well, if the noise is REALLY generated inside the mixer, then you have some seriously corrupt files. i use that mixer constantly and it has no such bug normally.

[dbmac]

I've seen (heard) this caused by poorly connected stdm cables, like redmuze suggested. I would double check the cables, especially since you've been moving the computer.

Also, see this topic:
http://www.planetz.com/forums/viewtopic.php?f=1&t=25580

/dave

[winger]

Humidity could be a problem on the stdm connectors. I just checked and the temp was 86 degrees F with 87% humidity. This could be the cause.

There was a discussion not too long about some chemical people were using for the stdm connectors. Anyone using it? What was it called? And where can I get it?

[dbmac]

http://www.posthorn.com/Stab_2.html

/dave

[winger]

Stabilant sounds like the way to go. However, 5 oz seems like a large amount for such a small job. Also, it sounds like you must dilute it down to a 15oz bottle included in the kit. Is that right? Now there are 15 oz where a few drops are all that is neededl. And $31+ ?? Don't get me wrong, it will be worth it if it solves the problem. Just seems line if you could buy just 1 oz it would still go a long way but should only cost $6-$7. The kit must be targeted for service people that will use it for multiple jobs, not so much for someone that will use it on a single project.

[luigicampala]

the stabilant solved my stdm problem so it was worth the price. i´m using it for other purposes (guitars etc.) too and it does a great job. give it try...

[darkrezin]

I don't think $31 is bad at all. Here in the UK a can of Caig DeOxit D5 costs £15-20 (before shipping). Maybe it's because it's usually high-end hi-fi dealers who usually sell it Anyway, things like this aren't mass-market enough to be cheap. They are definitely intended for service engineers. Stabilant 22 is used quite widely in fixing classic car electrical contacts. I think if you want a ready-diluted solution, you need to get Stabilant 22A (alcohol-reduced).