Propeller Head Plaza

Source impedance is normally the important factor

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Ole Lund Christensen

(M)

In Reply to: Re: What kind of cartridge, Pat? posted by Pat D on November 22, 2002 at 06:15:06:

The lowest of the two impedances the cable see, is normally the source impedance, say 1kOhm for MM, down to 2 Ohm for MC.
The source impedance load down the cable's generator, which is a high impedance generator.
Microphones often have 600 Ohm source impedance and low levels, making this cable microphonic effect audible.
Preamps and CD players have from a few Ohms to 2kOhm source impedance, but much higher levels, and thus relative less audible effect of microphonic cables.

Follow Ups:

Re: Source impedance is normally the important factor - Pat D 16:14:09 11/22/02 (3)
I have no idea what the source impedance of a Grace cartridge is.
What sort of magnitude are cable microphonics?
____________________________________________________________
"Nature loves to hide."
---Heraclitus of Ephesus (trans. Wheelwright)
- Re: Source impedance is normally the important factor - john curl 15:23:47 11/23/02 (2)
  Ole is correct. The Grado cartridge is low Z.
  - Re: Source impedance is normally the important factor - Pat D 18:25:19 11/23/02 (1)
    Well, I do own a Grado cartridge, but I no longer use it. They are supposed to maintain their FR pretty well into various capacitances, as I recall.
    I currently use a Grace F9E. Is it low impedance, too?
    
    ____________________________________________________________
    "Nature loves to hide."
    ---Heraclitus of Ephesus (trans. Wheelwright)
    - Re: Source impedance is normally the important factor - john curl 19:21:28 11/23/02 (0)
      I don't think so.

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