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Author Topic: Gain of Neumann microphones  (Read 865 times)

RuudNL

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Gain of Neumann microphones
« on: August 02, 2018, 03:08:15 am »

Some time ago, I found a document with an overview of the gain and de-emphasis of several Neumann microphones.
(The amplifier circuits.)
I am almost certain that it contained amongst others, the data of the U47, U87, U87ai and U89.
Unfortunately, it seems I can't find it anymore...
Who knows where to find this information?
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Brian Campbell

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Re: Gain of Neumann microphones
« Reply #1 on: August 02, 2018, 11:27:11 am »

This chart?
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RuudNL

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Re: Gain of Neumann microphones
« Reply #2 on: August 02, 2018, 01:49:44 pm »

Yes that is the one! Thanks a million!!
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uwe ret

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Re: Gain of Neumann microphones
« Reply #3 on: August 03, 2018, 12:00:41 am »

Here is an older 'official' document for nearly all pre-1981 Neumann tube microphones and the first generation (T-powered 70-series FET series). Unfortunately it does not include the U47/U48...
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RuudNL

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Re: Gain of Neumann microphones
« Reply #4 on: August 03, 2018, 02:13:20 am »

That is also an interesting one! Many thanks!
(I wasn't sure about the U47, it was a long time ago I saw it.)
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David Satz

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Re: Gain of Neumann microphones
« Reply #5 on: August 03, 2018, 07:16:57 pm »

I created the table that is in Brian Campbell's "Reply #1". It lists all the test parameters I could find in Neumann's InfoPool for microphones based on the K 67/87/870 capsule type. To my knowledge that's the only capsule type for which Neumann has built EQ into the amplifiers specifically to tailor the sound quality of the microphones, rather than simply to provide bandpass filtering--and that's why microphones such as the U 47 and U 89 were not included.

I think that the different design choices are interesting. Also, they should serve as a caution--for example, if you compare a U 87 with a U 67 or M 269 with the intention of hearing "the difference between tube sound and transistor sound" you will only fool yourself, and the table shows why.

BTW, Mr. Sattler's document was one of the sources for the table. It's listed as "docu0048.pdf" since that was its filename in the Neumann InfoPool.

--best regards
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