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You could try looking at the signal amplitudes from a chassis ear on a scope - the low frequency content usually dominates the overall amplitude particularly if you're only looking at a specific problem speed.
a Mic dies every time i use it and the control box has way to much variance in volume between channels for example channel 6 is twice as loud as any other channels and the rest are all around 20% different from each other. The advanced technology of this diagnostic tool kit makes it an ideal solution for quickly and accurately identifying problems in your vehicle.It comes with six clip-on sensors, 3 for a 5-meter extension cord, 2 for a 3-meter extension cord, and over-ear headphones, all neatly packed in the included tool case. This weekend I'm making a start on fitting the double cardan prop shaft, it could be that cures everything.
Software is compatible with Microsoft's Windows 7, Windows 8, and Windows 10 operating systems and Android devices and is available from STEELMANPRO. If you read my post you would know that the latest attempt to resolve it on my vehicle was Jan 2019.This comprehensive toolkit provides unmatched sound detection and solution identification capabilities, allowing mechanics to identify problems in all vehicles quickly. The intuitively designed and free downloadable software provides easy pinpointing of troublesome noises.