Whistling sound with dancers and lav mics

1. nyen5
   Member

   
   I have a group of dancers who want to shoot instructional videos. We don't have a pro video team and are basically learning from scratch. We have two Audio-Technica Pro 88W/T lav mics with only 2 frequencies. It works perfectly when there is only a single dancer using one mic. When I have two dancers doing instruction with different mics, I get a whistling sound. I'm using a Beachtek and I'm inputting in mono mode.
   
   I realize my mics are on the lower end of the usability spectrum, but I was advised that they would fit our simple needs. Is there a problem with my receiver placement, the distance between the dancers, their movement around each other, or is this unavoidable interference? Your help is greatly appreciated.

   Posted 5 years ago #

2. compusolver
   Member

   
   First - switch your Beachtek to stereo. In mono mode, you're mixing your two audio inputs permanently together. In stereo, each mic goes to its own track where you can tweak each in post.
   
   As for the whistling - perhaps one system is interfering with the other. Can you change frequencies? Does this happen in other locations or only in this one?
   
   If you can't change frequencies, contact your transmitter's manufacturer and ask for an exchange. If all else fails, sell one on ebay and buy a different brand that will allow a frequency different from either of the first two transmitters.

   Posted 5 years ago #

3. nyen5
   Member

   
   Thanks so much for your reply, Hank. Your advice makes sense. The whistling only happens when the two mics are being used together. We bought the mics in person at B&H in New York and the salesperson said that two systems wouldn't interfere with each other. Each system has 2 frequencies. I will definitely look into this. Thank you again!

   Posted 5 years ago #

4. compusolver
   Member

   
   B&H has fairly knowledgable people and they may have sold hundreds of those sets without any problems, but the manufacturing process is such that you are always liable to get a "lemon". B&H will take care of you though.

   Posted 5 years ago #

5. nyen5
   Member

   
   How far apart do frequencies have to be in order to not interfere with each other? One of my systems has 169.505MHz and 170.305MHz while the other system has 169.445MHz and 170.245MHz. Thanks!

   Posted 5 years ago #

6. compusolver
   Member

   
   You have already gotten the full extent of my ability to assist here. I am not a ham radio guy. Sorry.

   Posted 5 years ago #

7. pplui
   Member

   
   Could this be a feedback whistle?
   
   Maybe system "A" can eliminate feedback "A", and system "B" can eliminate feedback "B", but while using together, system A cannot eliminate feedback "B" and viceversa.
   
   Hope this can help...

   Posted 5 years ago #

8. compusolver
   Member

   
   Can you get feedback if you're not sending the signal to speakers? I've never experienced anything like that. But if he's running the signal through a field monitor with speakers, then yeah, that sounds like a good possibility.

   Posted 5 years ago #

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