20 Most Recent Sennheiser HDR-45 Consumer Headphones - Page 7 Questions & Answers

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.

Never used them, but distorted outputs indicates you are over-driving them, connected them to 'speaker out' rather than 'headphone out', Or you have already blown the drivers. Connect to a different sound source and see how they work then. You likely will not get a loud boom from any headset.

get new earphones those are cheap or you can adjust the head phone volume in the ipod or iphone in setings