Preparing the contact microphone Ischell C1


Choice of adhesive putty for the C1 Original:

  • Your system is delivered to you with 2 doses of adhesive putty, one white and one gray, they do not have the same sound.
  • The white putty has a linear sound and rather bright in the highs, this is the one you should use by default for your testing.
  • The gray putty sounds rounder in the bass and duller in the treble. When the sound remains too bright with the white putty, try with the gray putty in the same spot. Suitable for very brilliant instruments and sometimes for quartet, double bass, violin ...
  • We recommend that you start testing with the white putty. If after determining the best position the sound remains too bright or lacks roundness, then try with the gray putty in the same spot.

Preparation of the C1 Original contact microphone

  • Knead and stretch a portion of the supplied putty audio adhesive for at least 30 seconds to heat it up and make it stickier.
  • If it is less than 18 ° in your room, you can possibly warm it slightly by bringing it near a source of gentle heat.
  • Then make a regular roll 6cm long and 6mm in diameter.
  • Then place it around the edge of the microphone provided for this purpose, taking care to connect the two ends of the roll well by covering them, then release the central part without crushing it
  • The place chosen for installation must be clean and dry, degreased if necessary.
  • Put the microphone down then press it lightly, it should not touch the instrument, approximately 2 / 3mm.
  • Then seal the putty all around the mic to make the middle part of the mic airtight.
  • Then place a cable clip 3/4 cm with a little putty to avoid picking up noise by the cable.
  • If during the first tests a sharp feedback is heard, it means that the seal has not been respected, press the putty all around the microphone again.
  • If you find that the tonal balance is good but the sound is not homogeneous in its dynamics (volume of the notes) or harmonics, lightly press the microphone again, this will compress the sound and may correct these problems. If possible, use the adjustable shim provided. See below.
  • If you think you have compressed your sound too much, you can, without removing the microphone, try to pinch it to make it go up a bit. Attention, all these manipulations must be unplugged microphone.
  • Important: Only use the audio adhesive putty ISCHELL, any other putty will distort the sound.

Compression control

You can use the included adjustable compression shim to control the pressure on the mic. Indeed, the pressure on the microphone acts as an audio compressor, the more you push it into the adhesive putty, the more you compress the output sound, so you will have less level but a more stable sound in its dynamics. Can also correct harmonics that would be redundant on a violin, folk guitar ...

  • Place the microphone where you want it and lightly press it down.
  • Adjust the level of compression by turning the knob on the cleat.
  • Place the wedge on the microphone and press until it touches the surface of the instrument.
  • Wait a few seconds, remove the wedge then seal the putty all around the microphone to ensure a seal.
  • Try the instrument.
  • Increase the compression level if necessary by repeating this operation. 
  • The average compression point is located between the 5th and 7th point on the cleat, starting from the smallest.
  • Can be used to know the compression of your microphone if you need to remove it in order to reproduce it. Position the cleat on the microphone and then turn the knob until you feel you touch the microphone. Note the value of the button in order to reproduce this depression during the next pose.

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