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11
Klaus Heyne's Mic Lab / Re: Capsule Diaphragms: Nickel vs. Gold
« Last post by Marik on April 16, 2018, 02:49:26 pm »
But your claim that a Mylar film twice as thick as nickel would still be more compliant (i.e.flexible) than nickel is something I would like to see proof of. It does not seem logical.

Klaus,

The Young's modulus (i.e. a measure of the stiffness) for Ni is 190x10^6 PSI and for Mylar 1x10^6 PSI. In other words, Mylar is by far more compliant material.

When building a microphone it's not the goal to have as high tension as possible on the diaphrag. In fact the opposite is true, the lowest tension that still gives a stable result is desirable to extend the low frequency response.

Kai,

But with lower tension then you are losing top end response. The carefully chosen optimum tension/tuning frequency for a given capsule is always a part of a system comprised of capsule acoustical chamber parameters, time delay network, resonator system (if any), and desired voicing. It will also affect capsule's sensitivity.

Best, Mark Fouxman
Samar Audio Design
Omni8 Audio
12
Klaus Heyne's Mic Lab / Re: Capsule Diaphragms: Nickel vs. Gold
« Last post by Kai on April 13, 2018, 07:36:34 pm »
But compliance comparisons...
When building a microphone it's not the goal to have as high tension as possible on the diaphrag. In fact the opposite is true, the lowest tension that still gives a stable result is desirable to extend the low frequency response.
I once talked to Mr. Wutke from Schoeps here in Karlsruhe, and he told me that is what they do with their figure of eight and cardiod capsules. Omnis are different.
Metal could have a point over Mylar in long-term stability in that regard, but I'm only (educated) guessing here.
13
Klaus Heyne's Mic Lab / Re: Capsule Diaphragms: Nickel vs. Gold
« Last post by klaus on April 13, 2018, 06:50:48 pm »
I do to argue with the weight difference between similar-dimensioned nickel and Mylar diaphragms. But your claim that a Mylar film twice as thick as nickel would still be more compliant (i.e.flexible) than nickel is something I would like to see proof of. It does not seem logical.
14
Klaus Heyne's Mic Lab / Re: Nickel vs. gold sputtering
« Last post by Marik on April 13, 2018, 04:36:03 pm »
And I canít imagine a better conductor than gold. Since so little gold is actually deposited on a membrane,  it doesnít seem like raw material cost would be significant.

Mickey,

The layer of deposited gold is in the range of only 100 Angstroms, so it has pretty low conductivity to start with, which is not a priority here, as it is a very high Z circuit, anyway.

But that may defeat the purpose of using a very thin and agile metal diaphragm instead of a plastic one that usually is twice as thick or thicker than a metal diaphragm.

Klaus,

The effect of thickness here can be quite deceiving. The density of Ni is 8.9g/cm^3, and of Mylar only 1.38g/cm^3. That means that twice as thick Mylar will still be more than 3 times lighter than Ni counterpart (and more compliant). On the other hand, there will be other factors such as mass of loading air (which is moved along with the diaphragm and which is frequency dependent) and also stiffness of the air trapped between diaphragm and backplate, which works as a spring, effectively damping the diaphragm. Those may (or may not) negate all those mass and compliance differences.

Best, Mark Fouxman
Samar Audio Design
Omni8 Audio
15
Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by klaus on April 13, 2018, 03:40:15 pm »
Please report back if you find out what the problem's cause was.
16
Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by aremos on April 13, 2018, 03:35:44 pm »
Thanks Klaus.
Unfortunately I don't have either an extra PS or 67.
But my dealer is taking care of it already.
17
Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by klaus on April 13, 2018, 01:08:10 pm »
It may be the newly designed power supply, but that is mere speculation. If you have another U67 supply, you could, on a temporary basis, plug your new U67 and observe the result.

You could also do the reverse test: plug another (original) U67 into the new cable + power supply.
18
Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by aremos on April 13, 2018, 09:45:22 am »
Received the U67 reissue and after 1 hour of recording the mic started with a hum & no signal coming in!
Turned it off for 1/2 hour then turned it back on & has been working so far.
Any thoughts?

Called Sennheiser & they wanted me to trouble shoot my power source, power cable, preamp, etc. Told them that that protocol has been used by other mics, etc. Their response was to send the mic in - if I wanted to.

BTW, Mic sounds very nice.
20
Klaus Heyne's Mic Lab / Re: 7 Mics for Kim Jong Un - Why? What are they?
« Last post by gtoledo3 on March 31, 2018, 12:11:07 am »
Wouldnít they be rebranded Alctron mics? Stock guts (or cheaper), red, and with a big Trump logo? The Yuge47?
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