naturerecordists
[Top] [All Lists]

Re: microphone cable quality

Subject: Re: microphone cable quality
From: "Raimund" animalsounds
Date: Thu Dec 2, 2010 1:41 am ((PST))
Avocet wrote:

> The ME66/K6 outputs a low impedance
> signal designed for 600 ohm systems. 

The output impedance of the K6 module is 200 ohms and the minimal terminating 
impedance of the recorder is 1000 ohms. 

See 
http://www.sennheiser.com/sennheiser/home_en.nsf/root/professional_wired-microphones_broadcast-eng-film_k6-series_003279?Open&row=2

The 600 ohm telephone system has been designed for maximum energy transmission, 
which requires that the output impedance of the sender is matched to input 
impedance of the receiver. This principle was adequate for the ancient 
telephones over 50 years ago.

This impedance matching rule however does not apply any longer to modern 
microphones and audio recorders that have their own power supply and come with 
sensitive electronic preamplifiers. The input impedance should now be instead 
much higher than the output impedance, which will ensure that the output 
voltage of the microphone does not significantly drop due to the connected 
recorder.  

Regards,
Raimund







<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU