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Re: extension cables

Subject: Re: extension cables
From: "Colin" colinbox
Date: Thu Jan 28, 2010 8:49 am ((PST))

I can't help with technical issues but I have a feeling your problem may not 
necessarily be due to any technical issues anyway...

I'm a freediver (breath-hold diving) and used to be a scuba diver. With scuba 
equipment it's practically impossible to hear any airborne noises when 
submerged due to the noise of bubbles and equipment, but freediving is a 
completely different experience. We essentially shut down everything but the 
body's essential functions and slow down our heart rate, just like dolphins, 
whales, etc. In this extremely quiet state it is possible to hear airborne 
sounds even 10metres down. So I think you may be just experiencing airborne 
sounds as they are heard underwater. After all, air and water are not 
acoustically separated.

That doesn't help you resolve the issue but I hope it gives a new perspective.


--- In  "Grant Finlay" <> wrote:
> Slightly O/T but related..
> I've recently brought some hydrophones and tested them out a few days ago. 
> Very happy with the quality of the underwater recordings BUT have noticed 
> they seem to be microphonic, as in pick up audio from above the water at a 
> very low level but just audible.  
> info:
> Approx 10m cable, unbalanced jack to XLR input plug, into my SQN mixer.
> Is the simple solution to shorten the unbalanced cable? (But I still want 
> some length on the cable though) 
> Sorry if it seems like a dumb question but I only ever use professional 
> "balanced" equipment and have never come across this issue before...
> Grant

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