> >>I'm now at the point trying to sort out a value for the cap as
>>>Sennheiser did not specify. And that's all they show, just a cap symbol.
>>
>>
>> Big, big, big cap in series for low-frequency response. What's the
>> output Z of the mike?
>
>I have a impedance of 90 ohms. It's all in german, just to make it more
>fun. I don't have a lot of specs for the mic, sounds like you have about
>as much as I do.
>
>The biggest non polarized cap I have right now is 30mf, I'll give that a
>try, though it sounds like bigger from what you are saying.
Doesn't have to be non-polarized, it's got 5V on it! 3 dB down at 2
Hz with 90 ohms? Off-scale on my Shure (the mark of quality)
reactance slide rule. It gives 90 uF for 20 Hz response with 90 ohms,
so I think you want at least 900 (1000 uF) for 2 Hz response. Heck,
try 10,000 and let the mike limit the response. Of course the
preamp's and the recorder's inputs will both high-pass.
-Dan Dugan
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