[sdiy] Frustrating RF Interference

[Jimmy .]

So I got a used Tascam M-2516 mixer and now it is picking up FM radio 
country music in my monitors/headphones.  I've tried disconnecting 
everything down to just the mixer and a single keyboard running off the same 
power outlet to no avail.  Everything works fine with my old crummy 
Behringer mixer. Just can't figure this out.. I don't think there is a 
ground loop and I'm using a short, high-quality shielded cable.

I've heard that Tascam back in the day didn't do much in their designs to 
provide proper shielding and RF rejection.  Now to my knowledge the lowest 
FM station is 88.1 mhz; the signal somehow gets rectified inside the mixer 
and becomes audible.  Is there anyway I can filter out say everything above 
50khz on the line inputs and prevent the FM signal from getting rectified?  
I've tried ferrite chokes, but I think it will be too expensive for so many 
connections.  Can anyone advise me on how to add simple RF filtering on my 
mixer inputs?

Thanks,
Jimmy

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