1. Register NOW and become part of this fantastic knowledge base forum! This message will go away once you have registered.

Cable specs. Capacitance / resistance ???

Discussion in 'Accessories & Connections' started by PJ, Aug 26, 2001.

  1. PJ

    PJ Guest

    Pro Line microphone cables CPM # FM - technical data
    This cable is equipped with these
    NEUTRIK connectors. Cable used: CORDIAL CMK 222
    Conductors: 2x28x0,10mm = 0,22 mm2
    Shield: Spiral Wound Copper
    Overall Diameter: 6,4 ± 0,2mm
    Capacitance Cond./Cond.: approx. 70 pF/m
    Cond. Resistance: < 85 Ohm/km Ohm/km

    Fair Line microphone cables CFM # FM - technical data
    This cable is equipped with these
    NEUTRIK connectors. Cable used: CORDIAL CME 220
    Conductors: 2x25x0,10mm = 0,2 mm2
    Shield: Spiral Wound Copper
    Overall Diameter: 5,8 ± 0,2mm
    Capacitance Cond./Cond.: approx.200 pF/m
    Cond. Resistance: < 100 Ohm/km Ohm/km

    Yes. There I have specs of two different microphone cables. I know one is named Pro line and another just Fair line. But heck I don't understand a word of what these specs are trying to tell me.
    Ok, maybe I understand a little, but could someone clarify what are CAPACITANCE Cond./Cond. and Cond. RESISTANCE ??
    How much does this Fair line vs. Pro line affect the sound quality and in what kind of situations are smaller pF/m numbers better?
    Thanks!
     
  2. hargerst

    hargerst Active Member

    Joined:
    Jan 28, 2001
    Originally posted by PJ:
    Yes. There I have specs of two different microphone cables. I know one is named Pro line and another just Fair line. But heck I don't understand a word of what these specs are trying to tell me.
    Ok, maybe I understand a little, but could someone clarify what are CAPACITANCE Cond./Cond. and Cond. RESISTANCE ??
    How much does this Fair line vs. Pro line affect the sound quality and in what kind of situations are smaller pF/m numbers better?
    Thanks!The first part of the specs is what cable is used and the numbers are basically the thickness of the wires (conductors, or cond. for short).

    When you have two pieces of metal seperated by an air gap, you have a capacitor, which can act like a tone control and roll off the high end of the signal, if the cable is long enough. 70 pf/m means the cable adds 70 picofarads across the signal leads for every meter (39") of cable length. Cond./cond. means the capacitance is between the two conductors. The smaller the number, the better the cable.

    No wire is perfect; you lose a little bit of signal as the wire gets longer because the wire adds resistance (that's how wire-wound resistors are made). The 100 ohms/km means that in one kilometer of cable length, the cable will act like a 100 ohm resistor, in series with the mic output. It's measured from one end of the conductor to the other end. Again, the smaller the number, the better the cable.


    Is that any clearer?
     
  3. PJ

    PJ Guest

    Yep. Thank you! :D
     

Share This Page