Good morning.
I just signed this forum because i've notice that some of you guys know different microphones.
I'm having a problem while recording with my T.Bones SCT 2000 microphones. I red the wonderfull article about these mics and i decided to buy 3 for my professional audio recordings. I just do voice recording in my studio (books, and voice over for vídeos). And very often when i'm recording i listen to a kind of an whistle (hiss noise - 5Khz-10kHz) that is destructing my recordings. It happens with that 3 microphones and i dont have others the check if it is from the mics or from other source. The fact is that when i go in the voice booth i can listen to the noise coming from the mic itself.
Do you guys have any idea about if this is a problem with this mics or if it can be something else?
Does anyone have these mics too? Happens the same?
Thanks for helping me!
oh...and i'm from portugal.
By the way... i tried to isolate the problem.
At first i thougth it was cables: so i connected diferente cables directly between the Mbox and the mic. It was giving me the noises anyway.
Than i tried the electri source that feeds the mic pre-amp. So i used UPS batteries to feed electric power - and i still had the noise that is getting in my recordings.
Later i thougth it could be my PC. So i sent alll my system information to the Digidesign forum help and i was told that it could be my firewire drive - i bougth the recomended one and i still have the noise.
I just dont know what to do now, i i question myself if it could be the microphone. The mic sounds great when i don't have the noise. It doens't make sense. If someone could suggest me which way to go now i would appreciate that. Thank you very much.
Are you using a laptop, or do you have anything else with a laptop-style power supply plugged in? It could be noise from that on the earth (or just through the air) causing this, especially if it's a cheap or not-very-good power supply.
I have one desktop. I just have connected to my PC one external Lacie Firewire drive (but i've tested to work without it) and i have my ilock key connected too (for my plug-ins). Nothing else.
Do you think i should try to change my power supply from the PC? Or you mean the mic power supply?
This is strange because whe i turn off the mic power supply for 10 seconds i can work the next 10 minuts witout noises. Do you think is the mics power supplys? But i can't use that mics without the power supplys... Don't know what to do..
despite your using an isolating transfo in the UPS, I would also get the phase and the earth to your house supply checked by a GOOD electrician.
Especially the earth. If you have an external spike, you could try chucking several gallons of water on the ground all round it, especially if you have not had much rain in a while.
But your most recent post indicates something that is loading up over time.
Interesting.
Do you have three power supplies for the mics or just the one split over three mics? This too could be a potential cause of problems.
In fact the more I think about it, the more I am convinced you have a mic power supply problem, probably capacitor(s) gone bad.
Unless of course you have more thean on ePSU and they all do it.... once again back to it being unlikely that you`d have three bad power supplies.
Well, i still have the problem when is rainning, and i have 3 different power supllys. The mic is the T.Bone SCT 2000 (you can see it in thomann.de website).
It does seem unlikely that all 3 mics would have the same fault.
Could the mics be picking up some noise that is inside the booth ?
What kind of lighting do you have ? some energy saving bulbs or flourescent tubes can wistle or hiss.
You could try turning the lights off, even if you only prove it is not a problem from the lighting.
Is there really no other mic you could borrow from somebody?
I have one of these mics being used in the uk and it does not have this problem. I agree with some of the above, there must be a common denominator and not 3 bad mics/PSUs.
First thing I'd check is that the phantom power is switched off on the interface, as these mics don't like phantom coming into their PSUs.
It could be anything electrical sitting around, I remember recording in a radio broadcast room and all the equipment made their own symphony on the recording. No beethoven though.
Until you find it use the EQ in pro tools and try and find that frequency with a cut with a fine Q.
