Introduction

The DM-100 is still the go-to microphone for all Legria / Vixia camcorders. This basically includes all Canon camcorders starting with "HF". The mic has a high price point of about 190$, and has a design flaw that will render it unusable after only a couple of years of use.

Symptoms: The microphone produces a rattling noise when the camera is being moved, basically rendering it useless for all other than stationary shots. This guide will give a quick fix to the problem for less than a dollar.

Image 1/1:
  • This is the rattly beast.

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Image 1/1: Use a set of tweezers (or a pointy metallic object, I used a tiny screwdriver) and gently pull  in a circular fashion not to destroy the metal girder.
  • You access the internals by removing the grill in the front, which is held in place by a small amount of adhesive.

  • Use a set of tweezers (or a pointy metallic object, I used a tiny screwdriver) and gently pull in a circular fashion not to destroy the metal girder.

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Image 1/2: The pipe visible behind the elastic  is supposed to be mounted toe the inner wall with the two marked circular joints. Image 2/2: These incredibly weak joints are bound to break as the rubber loses its elasticity.
  • Canon has used an elastic band for vibration reduction of the directional "sound pipe" (seen as a circle behind the elastic band).

  • The pipe visible behind the elastic is supposed to be mounted toe the inner wall with the two marked circular joints.

  • These incredibly weak joints are bound to break as the rubber loses its elasticity.

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Image 1/2: Image 2/2:
  • Rubber band is irreparable and needs to go. I scratched it out using a small, sharp screwdriver.

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Image 1/1: When the rubber band breaks because of the bad joints, this thing hits the inner side of the cylinder.
  • The culprit of the rattling noise is now apparent. A plastic cylinder stretches through the whole of the microphone, enabling the microphones forward focused / directional sound.

  • When the rubber band breaks because of the bad joints, this thing hits the inner side of the cylinder.

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Image 1/3: After some searching, I found a 2mm thick foam sheet  for about 50 cents at a hobbyist shop. Image 2/3: Use this to cut a small sheet of depth of about 2 cm and length matching the inner circumference. Image 3/3: Use this to cut a small sheet of depth of about 2 cm and length matching the inner circumference.
  • I measured the internal diameter, and found that there in total was a void of about 2mm in between the tube and the mic cylinder.

  • After some searching, I found a 2mm thick foam sheet for about 50 cents at a hobbyist shop.

  • Use this to cut a small sheet of depth of about 2 cm and length matching the inner circumference.

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Image 1/1:
  • After some scissoring, you should have something that looks a bit like this.

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Image 1/1:
  • Add a dab of glue around the foam to make sure it stays in place.

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Image 1/1:
  • Add a thin layer of glue to the yellow circle and reattach the grill and windstopper.

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Image 1/1: The audio quality isn't affected at all.
  • There! 190$ microphone fixed for less than a dollar.

  • The audio quality isn't affected at all.

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Conclusion

The DM-100 is a good, but expensive microphone for all Canon camcorders. The internal suspension is broken by design, and will render the microphone unusable after 2-3 years of use.

This fix is a permanent fix to Canons poor design. Since the pipe is solid, and the foam is only reaching about 2cm into the pipe, audio quality is not affected at all.

Bonka

Member since: 05/15/2015

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