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Author Topic: Neumann U67 Reissue: Complete Tear Down and Analysis  (Read 1767 times)

Offline RuudNL

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Re: Neumann U67 Reissue: Complete Tear Down and Analysis
« Reply #15 on: September 04, 2018, 01:30:30 pm »
I was a bit surprised that I didn't read a word about the change in shape of the base below the microphone capsule.
In the 'old' U67 there was a dome shaped piece just below the capsule itself.
In the 'new' U67 the capsule sits higher in the headbasket, but the base where the capsule is mounted on, is flat.
IMHO this could influence the sound. Any opinions?

Offline Jim Williams

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Re: Neumann U67 Reissue: Complete Tear Down and Analysis
« Reply #16 on: September 05, 2018, 11:22:43 am »
That will affect the response. I noticed in similar mics with a domed mount that the shape does create reflections, resonances and some nulls too.

Mounting the capsule a few mm higher can overcome some of those reflections. A complete frequency response plot with the differences would also be informative but that isn't likely to happen here.

Offline klaus

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Re: Neumann U67 Reissue: Complete Tear Down and Analysis
« Reply #17 on: September 05, 2018, 05:38:47 pm »
That (shape of mounting base) will affect the response.
Whether or not, or if, how much the shape of the base affects the sound of the mic is probably hard, if not impossible, to listeners. Unless all that is done, the statement is speculation.

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I noticed in similar mics with a domed mount that the shape does create reflections, resonances and some nulls too.
Again, speculation, unless proven. I could as well argue (and probably trace) the exact opposite: parallel surfaces - here, a flat base plate, flat capsule sides, flat top of basket- may create standing waves of a higher audible magnitude than the somewhat random reflections off a curved surface (as with the old base).

But the reason I mentioned only the capsule-height differences in my review, and not any acoustical effects of the U87Ai base used in the Reissue vs. the old U67/87 curved one: I did not hear any. And what I heard was the focus of my review.
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Mounting the capsule a few mm higher can overcome some of those reflections
How would you know? It might as easily affect just the wavelength of the reflection, with little decrease in its volume, or may result in nothing audible at all. For me, it was the latter. So I left it out of the review.
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A complete frequency response plot with the differences would also be informative but that isn't likely to happen here.
No, indeed, "here" we listen to detect subtly of sounds, rather than running test tones or protocols.

« Last Edit: September 06, 2018, 09:28:18 am by klaus »
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Offline Jim Williams

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Re: Neumann U67 Reissue: Complete Tear Down and Analysis
« Reply #18 on: September 06, 2018, 11:42:52 am »
I have done some tests that exposed the reflection effects. It was so audible the capsule had to be raised up 5 mm to overcome it. It was on a Rode NT-2 that I designed for Rode back in the mid 1990's.

No, I didn't bother with frequency sweeps as I don't have the anechoic room to do that here.