An annoying screech in my studio!!

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Rorymonster

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I have just been getting used to my new Behringer Truths monitors and have been really please with them so far. :D

However they emit an annoying screeching sound that you can only hear when play is stopped. This screech changes in pitch/tone whenever the midi transmitter is active! :sad:

I have tried unplugging my MT4 midi transmitter and then the sound stops. THough I can't do much without my transmitter plugged in!

This was never an issue with my previous monitors and still isn't as I've tried to hear it through them, and I've never heard it in headphones. :? And yet it's difficult to find fault of either the monitors or the transmitter if they both work perfectly and silently in isolation.

All help or advice appreciated. Fank u merry dutch!
 
how does the MT4 midi transmitter work? does it transmit infra-red (like a remote or an IRDA mobile linked to a laptop), or is it an RF (radio frequency) signal, like a mobile phone or walkie-talkie? It should say this on the documentation somewhere.

my guess is that its RF and your monitors are picking up and demodulating the signal from the midi-transmitter. a bit like how a stereo sometimes picks up the taxi-cabs or analogue old bill radios - particularly as the whine changes with the midi signal being changed

try using better screened cable, balanced audio feed into the desk (if not using this already), and keep the midi-transmitter and monitors as far away from each other as possible...
 
Thanks a lot GL (excuse the abbrev.). I was beginning to worry noone would have any idea! Yours seems like a good suggestion - particularly better cables and a greater distance between.
The MT4 works by USB so I would assume it is neither infra-red nor RF, but maybe I'm missing your poing here, I'm not sure.
I'll try shifting things about abit and see what happens.
Cheers. :)
 
Rorymonster did you manage to get rid of that annoying Screech yet?
 
Rorymonster said:
Thanks a lot GL (excuse the abbrev.). I was beginning to worry noone would have any idea! Yours seems like a good suggestion - particularly better cables and a greater distance between.
The MT4 works by USB so I would assume it is neither infra-red nor RF, but maybe I'm missing your poing here, I'm not sure.
I'll try shifting things about abit and see what happens.
Cheers. :)
Click to expand...

apoliogies for any confusion - I had assumed that as you'd describe the equipment as a "transmitter" it was some sort of wireless midi interface so you could play a keyboard and dance around the room (like DiscoPete does with his lighting kit).


It appears looks like the circuitry in the MT4 is giving off interference - so phsically seperating it from analogue audio cables could be a good idea.
 
what you're experiencing is an "earth-loop" type situation. sometimes it shows up as a 50hz hum, but I found with computers (especially laptops) in the studio you end up hearing the computer working.

I guess that the previous monitors you had weren't active? I had exactly the same problem, using Tannoy Reveal passives : No problem. Install Reveal Actives and suddenly could hear the computer running in the background (the sound is there constantly, it's just you don't hear it when your music playing too!)

There are two ways to sort it:

1) disconnect the earth from any computer equipment (the computer, external drives etc)
2) get a DI box (behringer have an 8way rackmountable one for £80) and patch it between the output of your desk and the inputs to your monitors

btw the MT4 is just a standard USB midi interface made by emagic, that screeching sound is usually the sound of the hard-drive doing it's thing, moving windows around the screen should cause the same effect.

hope that sorts your problem rory! :)

love & light

richie x
 
THanks for the further recommendations.

A couple of points:
My old monitors were also active.
Moving windows around does not have the same effect, and if I use my studio with no midi then there is no problem at all.
I think the solution lies in creating the greatest distance possible between the transmitter and the monitors, though I still need to buy new cables to achieve this!

Meanwhile if I monitor at a high enough level I don't notice... Not good enough really is it!!??

Cheers anyway. :)
 
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