Lang, don't you think soaking an mkh-20 is a little risky? Does an mkh dry
out pretty well after it is wet? I tried adapting a pair of contact mics
which was recommended for dolphin recording by the manufacturer after they
said the biggest problem was making sure the dolphins didn't eat it. We'll
to make a long (but entertaining) story short I think I got roughly 2
seconds of sound before the rest of the day was spent salvaging what I
could. In the end I bought another pair of contact mics ...
-----Original Message-----
From: Lang Elliott
Sent: Thursday, February 28, 2002 8:16 AM
To:
Subject: Re: [Nature Recordists] Re: homemade hydrophone
Mark:
Do you think the AFAB will produce better sound than a Sennheiser MKH
20/condom combo? I imagine that using a condom will drastically change the
frequency response, causing significant rolloff at higher frequencies. Is
this true?
Lang
>
>> From: Lang Elliott <>
>
>> At some point we discussed how to make a simple hydrophone using a
condom
>> pulled over a microphone.
>>
>
> Lang,
>
> For starters, use an unlubricated condom!
>
> Seal the open end around the mic cable (making sure to cover the XLR
> connector) by making rings around the cable with electrical or duct
tape.
> WD-40 will remove any sticky tape residue afterwards. You could also
> construct a cable with a couple of rubber "O" rings on it.
>
> Tie the condom tightly to the mic cable in several spots, stretching the
> condom over the rings.
>
> I've only tried this method to a depth of 10 feet, and for about 15
minutes,
> on a dynamic mic and it worked just fine (as waterproofing, the sound
was
> muffled). I didn't use an electret or condenser because I didn't want to
> risk an expensive mic in salt water.
>
> The main disadvantage of the waterproofing is the inefficient acoustic
> coupling of the mic element to the water.
>
> If you want a low-cost, good performance hydrophone, I like the AFAB.
Less
> than $150!
>
> http://www.afabsound.com/
>
> hope that helps,
>
> Mark
>
>
>
>
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