20 Most Recent Sennheiser MM 550 Wireless Headphones - Page 6 Questions & Answers

I assume you mean the mic plug/jack. Bent pins or broken connectors will require a new jack and/or plug installed and they are not easy to do. These 3.5 mm jack connectors require both a light touch during install and soldering. If you're a pro then start shopping for a replacement 3.5 mm mono jack but be warned. The jack may solder directly to the PC board....which reminds me. Look for broken connections from jack to PC board..a common failure point and resolder as needed.

This doesn't sound good...mic cartridges are pretty fragile and is why I recommend buying quality mic's so that a few "drops" won't change the sound. That being said, the Sen MD431 is over $400 which should mean either you gave it one heck of an impact, or the mic has a manufacturing defect. Try returning for factory service BUT request an estimate B-4 repair.

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you might check to make sure that your gain isnt to high many times this can negatively effect your sound quality

The mic likely requires professional service.