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 shiny 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. Place the wedge 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.

Choice of adhesive putty for C2 and C3:

• Your system is delivered to you with 2 doses of adhesive putty, one white and one gray, they don't 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.

Preparation of contact microphones C2 and C3

• The amount of putty used to place the microphone influences the compression of the sound. The dose provided is 3,5 grams. With the full dose of putty, the sound is not compressed, with half, or 1,5 grams, the sound is very compressed.
• By default, to start your tests, remove a third of the dose to have approximately 2,4 grams which corresponds to an average compression. Knead and stretch the putty for at least 30 seconds to warm it up and make it stickier before use.
• 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 6 cm long.
• 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 pull out the central part to form a bowl. Take inspiration from the photos below for the preparation of the putty and its placement around the microphone.
• The place chosen for installation must be clean and dry, degreased if necessary.
• Place the microphone then press on it by making a very small movement from left to right to make it adhere well and ensure the seal.
• Then place a cable clip 3/4 cm with some remaining putty to avoid picking up resonances through the cable.
• If during the first tests a high-pitched feedback is heard, it is because the seal has not been respected, press the microphone again.
  
• About sound compression: it allows you to balance the power of the strings or notes between them, it also helps to attenuate any annoying harmonics and to reinforce bass and precision. However, if it is too compressed, the sound can become harsh in the attacks, closed, with a lack of resonance, expression or presence in the treble. With a sound that is not compressed enough, there may be an imbalance between notes or strings, redundant or distracting frequencies, a sound that is too broad with a lack of precision. Adjust the dose according to the result obtained.
• If the microphone does not seem to be in the right place, gently remove it then reform the putty all around by giving it height, you can then try again positioning without having to redo the process of preparing the microphone.
• If the sound is too bright, use the gray adhesive putty which has a duller sound in the highs and rounder in the lows.
• Important: Only use the audio adhesive putty ISCHELL, any other putty will distort the sound.