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So this is a weird one. Regular Sennheiser 50/30 Midside setup into a Sound Devices 552. Mics are being matrixed by the mixer and output as stereo. I've been doing a fair bit of b-roll in small towns lately and at least 1/2 the time when a loud Harley motorcycle passes by, the right channel of the mixer will drop out completely for a second. It will also happen with big (loud) diesels. Just cuts out completely on one side. 552 Level meter is fine on the left and drops to nothing on the right. As soon as the noise passes the right channel comes back. I've had this rig for a few years and have never had a problem with it except for this. It's happened a few times in the past but I seem to be in locations recording when loud vehicles pass more often lately and it's getting annoying. So the sounds that trip it are low frequency and rhythmic and it doesn't matter which side of the mic they are on. It's always the right side that goes. Which is also weird since I would imagine that if its some sort of microphone overload on the MHK 30, the mid signal would stay up - how can one side of a dual mic midside rig fail? But then again, who has ever heard of a single side of a stereo pair (momentarily) failing in a 552 because a Harley drove past? Any Ideas? I have tried different cables... Cheers, Brent Calkin