Hi, I have an AKG wireless UHF transmitter and the particular Countryman Headset mic requires lots of gain. This introduces static and hiss into my Mackie sound board. Other than replacing the wireless unit or mic, does anyone have a suggestion for a simple circuit for vocal frequencies to eliminate this.
I have tried a passive RC with R= 1.5k and C =.022uf
It works, well the vocals seem flat. It cut some of the hiss but the price is overall brightness.
If this isn't the right group, please direct me.
I have tried a passive RC with R= 1.5k and C =.022uf
It works, well the vocals seem flat. It cut some of the hiss but the price is overall brightness.
If this isn't the right group, please direct me.
The noise you are getting is probably FM background noise, which has a wide spectrum. That's why no filter would be of much use here. If you give us more detail on how the mike is connected to the console and such, we might be able to help more in identifying the culprit.
You're right. The post was in the wrong forum but I fixed it for you.
Welcome to the forums!
Regards,
Milan
You're right. The post was in the wrong forum but I fixed it for you.
Welcome to the forums!
Regards,
Milan
Well, nothing out of the ordinary.
Akg PT40 bodypack, with AKG WMS40 reciever.
COuntryman Isomax headset mic.
The WMS40 is feeding a Mackie 1402vlz Mixer thru xlr.
The gain is way high on both transmitter and receiver, inorder to get decent input to the mixer. The gain pot for that chanel in this configuration is about mid way. I can decrease the gain from the AKG side and increase the gain on the Mackie side, but with about the same results. THe mackie feeds direct to QSC and behringer amps which don't exhibit hiss normally with other equipment. Tried diff chanels, it's the AKG.
I guess i thought a simple filter would kill some of the hiss.
Maybe an active filter would work???
Akg PT40 bodypack, with AKG WMS40 reciever.
COuntryman Isomax headset mic.
The WMS40 is feeding a Mackie 1402vlz Mixer thru xlr.
The gain is way high on both transmitter and receiver, inorder to get decent input to the mixer. The gain pot for that chanel in this configuration is about mid way. I can decrease the gain from the AKG side and increase the gain on the Mackie side, but with about the same results. THe mackie feeds direct to QSC and behringer amps which don't exhibit hiss normally with other equipment. Tried diff chanels, it's the AKG.
I guess i thought a simple filter would kill some of the hiss.
Maybe an active filter would work???
I have actually 2 different bodypack and transmitters. They both work fine independantly of the Countryman Isomax headset. I emailed countryman and they confirmed that the Isomax does require more gain for this mic. Different cables, diff channels. I mean the noise is not terrible, but I just don't like any noise. The "noise" seems to follow speech patters. I mean it gets quieter when you are not talking, but then if you talk or sing the noise level increses or follows the voice input. I've almost decided to live with it, I mean when the music is playing you can't hear the "noise" over the instruments.
Now you've got me thinking about the wiring of the mic itself. I don't know enough about mic construction, but what if the polarity was swithched inside the mic itself. The mic has a mini-XLR connector. I guess I could rig up something and test switching the + and - on the mic before going to the bodypack, but then again it might not matter.
Now you've got me thinking about the wiring of the mic itself. I don't know enough about mic construction, but what if the polarity was swithched inside the mic itself. The mic has a mini-XLR connector. I guess I could rig up something and test switching the + and - on the mic before going to the bodypack, but then again it might not matter.
The AKG PT40 transmitter gives only 3.8V on the mike input that feeds the electret capsule. The Countryman Isomax headset needs 15V (as per datasheet) if you're using the electret capsule. It is possible that the supplying voltage is too low for the mike to function properly. The breathing noise is normal when the level of the signal coming from the mike is too low (it is caused by the compander).
Regards,
Milan
Regards,
Milan
Thanks Moamps for id'ing the problem.
At this point I'm not sure if there is a fix, or if it's worth the effort. Seems like a big leap in trying to get more voltage to mic.
This particular body pack has 2 AA batteries. I will have to check, but maybe a 9v battery could be substituted with a voltage divider network so that the bodypack would operate on 3v and I could supply the mic with 9.
Would it simply be a matter of supplying 9V to the + and - leads?
I know it's not 15v, but it may help?
I guess a lesson in Mic construction might be inorder.
At this point I'm not sure if there is a fix, or if it's worth the effort. Seems like a big leap in trying to get more voltage to mic.
This particular body pack has 2 AA batteries. I will have to check, but maybe a 9v battery could be substituted with a voltage divider network so that the bodypack would operate on 3v and I could supply the mic with 9.
Would it simply be a matter of supplying 9V to the + and - leads?
I know it's not 15v, but it may help?
I guess a lesson in Mic construction might be inorder.
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