Group Buy Interest?

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chance said:
What is the purpose of the corrogations. Is it increased surface area?
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I've been wondering the same thing...maybe it helps to get the thing moving. If it were flat, it might not catch the air pressure waves/sound waves as easily, especially from multiple directions. The corrugations, with their multiple faces, are aligned toward many directions at the same time. Best guess...

apl said:
My guess is that they give the ribbon some stretchiness.
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That does make sense. It seems to me the corrugations would also lend some structural integrity to the ribbon, helping it hold it's length.

I await my well-deserved correction :D
 
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chance said:
What is the purpose of the corrogations?
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Wow, we are already on page 77 and that part still hasn't been covered, yet :eek:.

There are two important points.
1) Think of the ribbon without corrugation as a marimba bar, which would resonate like crazy any time sound waves hit it.
Once we put "folds" they work like a spring, absorbing lots of nasty resonances (but not all).
2) The ribbon microphone is a so called mass controled system, where for flat frequency response throughout the band we need it tuned to the lowest frequency. If there was no corrugation, there would be impossible to tune it. On the other hand, if the corrugation overdone, then it is... impossible to tune it right, either ;).

Best, M
 
Chris Long said:
I've been wondering the same thing...maybe it helps to get the thing moving. If it were flat, it might not catch the air pressure waves/sound waves as easily, especially from multiple directions. The corrugations, with their multiple faces, are aligned toward many directions at the same time. Best guess...



That does make sense. It seems to me the corrugations would also lend some structural integrity to the ribbon, helping it hold it's length.

I await my well-deserved correction :D
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Strange
How did you quote APl before he even posted what you quoted?
 
I'd like to say I can read minds, or had a time machine handy, but...it's just a cut and paste job. I was editing my post when APL posted, so I responded to his. Doesn't help the flow, perhaps...sorry.
 
Marik said:
Wow, we are already on page 77 and that part still hasn't been covered, yet :eek:.

There are two important points.
1) Think of the ribbon without corrugation as a marimba bar, which would resonate like crazy any time sound waves hit it.
Once we put "folds" they work like a spring, absorbing lots of nasty resonances (but not all).
2) The ribbon microphone is a so called mass controled system, where for flat frequency response throughout the band we need it tuned to the lowest frequency. If there was no corrugation, there would be impossible to tune it. On the other hand, if the corrugation overdone, then it is... impossible to tune it right, either ;).

Best, M
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Interesting. So when one takes up the slack, do you simply remove the slack? or do you put some tension on the folds. (or is that where the expertise comes into play) Trial & error?
 
How does everyone feel about the cost vs the ribbon problem?
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my ribbon hasn't arrived yet, but i'm assuming that i'll have to re-tension it...and honestly, i don't really care. i was planning on upgrading to one of the edcor transformers regardless, so i can do that at the same time...

when it comes down to it, the $55 mic with the $20 transformer and an hour or two of labor is probably going to sound damned close to mics that are $1000+, so there's no room for complaint IMO
 
Forgive me if this has already made the rounds:

Who's transformers are you switching the stock transformers out with? Please link.
 
There's a number of options, several are looking into a couple, no-one has actually completed the task yet...

I don't think there's a single "recommended" model/link as of yet.
 
Just got through staring at my ribbons with a flashlight. I'm pretty sure the ACM-4s (the double ribbon mics) are fine, but it's hard to see through them to know for sure. :)

As best I can tell, both of my ACM-2 and ACM-3 mics have a tiny bit of sag... maybe half a millimeter from straight when I tilt the thing to one side or the other. That's probably within acceptable tolerances, though. Definitely nowhere near far enough to have a double bend or touch the magnets. No scraping sound or anything.... I'd say that all four are ok. Of course, looking through the headbasket skews your perspective almost as much as watching Fox news, so I could be wrong.... :D

What's a reasonable amount of allowable bow when resting one of these on its face?
 
dgatwood said:
Of course, looking through the headbasket skews your perspective almost as much as watching Fox news, so I could be wrong.... :D
its face?
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ROFL
If they ever turn Signatures back on I really must put this in my quote. That's just beautiful!
 
dgatwood said:
Of course, looking through the headbasket skews your perspective almost as much as watching Fox news, so I could be wrong.... :D
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I ordered mine with "fair and balanced" headbaskets, so I should be OK?
 
dgatwood said:
Just got through staring at my ribbons with a flashlight...As best I can tell, both of my ACM-2 and ACM-3 mics have a tiny bit of sag... maybe half a millimeter from straight when I tilt the thing to one side or the other...What's a reasonable amount of allowable bow when resting one of these on its face?
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1/2 mm sag from horizontal is going to work fine - though perhaps with a resonant frequency a bit too low, maybe in the 10-20Hz area. Not worth the risk to retension.
 
one of my ACM-3s is severly sagging and it even looks like some of the corrugations in the middle are barely even there anymore. does this mean i might need a new ribbon altogether?
 
crazydoc said:
Marik -
Do you have any knowledge of and/or comments about these or other transformers?
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It is a matter of taste, but I generally like the Lundahls more than Cinemags, as they nicely compliment the "ribbon sound". For me Cinemags, due to their Nickel core have more accent on the lower end, which ribbons have plenty, to start with.

I did not use Edcor. Although reasonably priced, what turning me off is an advertised high primary DC resistance (0.4 Ohm, IIRC). If true, it can lead to a high noise (hiss).
Besides, I don't quite understand what "virgin copper" means :eek: :).

Whenever I need some "special effect" or perfect match with particular ribbon mic, I wind the transformer myself.
 
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