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Re: extension cables

Subject: Re: extension cables
From: "Rob Danielson" danielson_audio
Date: Fri Jan 22, 2010 11:21 am ((PST))
At 9:54 AM -0800 1/22/10, Dan Dugan wrote:
>I have a hundred-foot 3.5 mm stereo extension that's .0075 uF from 
>one channel to shield. Assuming a 2 Kohm source, it would be a 
>gentle low-pass filter at about 10 KHz, if my slide rule technique 
>is right.
>-Dan Dugan

Hi Dan--
Its a pleasure to use a rule isn't it?

Next time I install a long cable run, I'm going to record the test I 
did where I connected two Rode NT2000's (7dB[A] self noise)-- one to 
a 20' mic and the other to a 1000' role of cable and placed the mics 
side by side. Prior to this, I looked at all the charts and did the 
HF loss computations and then Richard Lee (miclist) suggested the 
obvious perception test. Result: to my aging ears (significant loss 
above 9-10Khz), I could not detect any loss of signal or HF.  I use 
Symetrix SX202 Mic preamps. RFI-wise on my two 700'+ runs, I 
sometimes get very faint radio on one mic from a station in Western 
Texas when the conditions are just right-- its very,very rare. The 
other 3, same model mics get none.  I'm running 5 conductor 
studio-grade wire ~$180 for 1000'. Rob D.


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