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Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?



 
 
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  #1  
Old September 15th 20, 03:12 PM posted to rec.audio.pro
slinkp
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Posts: 27
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

I'd like to try the shunt resistor trick, as per eg. that old Paul Stamler article, but i have no idea where my soldering kit has got to, and exercising my soldering skills (terrible) is no longer on my list of "fun things to do with my very limited free time". Plugging in a presumably inexpensive thing that's already wired up and seeing if I like it does sound fun though..

So if there's a place or person that sells eg. an XLR barrel with a suitable resistor already correctly wired into it, I'd happily buy one. Google's not turning up such a thing but it's hard to know exactly what to search for..
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  #2  
Old September 15th 20, 03:35 PM posted to rec.audio.pro
Mike Rivers[_2_]
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Posts: 2,136
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On 9/15/2020 10:12 AM, slinkp wrote:
> I'd like to try the shunt resistor trick, as per eg. that old Paul Stamler article, but i have no idea where my soldering kit has got to, and exercising my soldering skills (terrible) is no longer on my list of "fun things to do


> So if there's a place or person that sells eg. an XLR barrel with a suitable resistor already correctly wired into it, I'd happily buy one.


This isn't the sort of thing that becomes a commercial product, though
you might find some on this newsgroup or some other recording-related
forum who will volunteer to make one for you for cost and shipping.

I would, but I won't - because the 600 ohm resistor that Paul came up
with for his article was the best compromise, as evaluated by his
students, for the mic, preamp, and source. Different resistors sounded
different and may sound better than 600 ohms (or no resistor) on a
different source.

The other thing - and maybe now that I think about it, it might not be a
600 ohm resistor after all, but a different value - is that what they
really determined. This is the load on the microphone, which equals the
preamp's input impedance with a resistor in parallel that total 600
ohms. I may not have the number right, but that's the principle.

Paul conducted his experiment using a preamp that he designed and built
himself, so your preamp will be different.

If you want to experiment with varying the load on a microphone, I'd
suggest that you give some consideration to buying a Cloudlifter Z. It's
a pre-preamp with a built-in variable load resistor. Even with the load
resistor switched out, the Cloudlifter will make your SM57 sound better,
and you can fiddle with the variable load to see how (and if) it affects
what you're recording.

https://www.cloudmicrophones.com/cloudlifter-cl-z

Unfortunately it costs about $250 new, but they're available on the used
market.





--
For a good time, call http://mikeriversaudio.wordpress.com
  #3  
Old September 15th 20, 06:43 PM posted to rec.audio.pro
Roy W. Rising
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Posts: 381
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

I can't seem to find a suitable XLR F/M barrel, how about a 2' cord with a 1% 600 ohm resistor in one end? Send me an email, it's yours for $10, including shipping. ~ Roy
  #4  
Old September 15th 20, 07:02 PM posted to rec.audio.pro
Roy W. Rising
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Posts: 381
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

Some newsreaders don't include my email, so here 'tis -
  #5  
Old September 15th 20, 07:45 PM posted to rec.audio.pro
slinkp
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Posts: 27
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On Tuesday, September 15, 2020 at 10:35:26 AM UTC-4, Mike Rivers wrote:
> On 9/15/2020 10:12 AM, slinkp wrote:
> > I'd like to try the shunt resistor trick, as per eg. that old Paul Stamler article, but i have no idea where my soldering kit has got to, and exercising my soldering skills (terrible) is no longer on my list of "fun things to do
> > So if there's a place or person that sells eg. an XLR barrel with a suitable resistor already correctly wired into it, I'd happily buy one.

> This isn't the sort of thing that becomes a commercial product, though
> you might find some on this newsgroup or some other recording-related
> forum who will volunteer to make one for you for cost and shipping.
>
> I would, but I won't - because the 600 ohm resistor that Paul came up
> with for his article was the best compromise, as evaluated by his
> students, for the mic, preamp, and source. Different resistors sounded
> different and may sound better than 600 ohms (or no resistor) on a
> different source.
>
> The other thing - and maybe now that I think about it, it might not be a
> 600 ohm resistor after all, but a different value - is that what they
> really determined. This is the load on the microphone, which equals the
> preamp's input impedance with a resistor in parallel that total 600
> ohms. I may not have the number right, but that's the principle.
>
> Paul conducted his experiment using a preamp that he designed and built
> himself, so your preamp will be different.
>


Thanks for the thoughts, Mike!

It took some poking on archive.org but I found the article.
It was a UA 610 preamp, did he design those? (Honest question I have no idea)
Point taken anyway - I don't have one
https://web.archive.org/web/20171123...etail/330.html

He says "I chose 698 ohms as a good compromise resistor value that gives a total load of about 500 ohms (±10%) with common available preamp impedances from 1500–2400 ohms. If you want to tailor the resistor to your preamp or board’s actual value, see the sidebar" and then there's a section where he discusses the formula.

Apparently the 610 has a nominal input impedance of 2k according to the article. My Focusrite Scarlett 2i2 is even higher at 3k.
By his formula, 600 ohms would work for me: 1 / (1/500 - 1/3000) = 600

> If you want to experiment with varying the load on a microphone, I'd
> suggest that you give some consideration to buying a Cloudlifter Z. It's
> a pre-preamp with a built-in variable load resistor. Even with the load
> resistor switched out, the Cloudlifter will make your SM57 sound better,
> and you can fiddle with the variable load to see how (and if) it affects
> what you're recording.
>
> https://www.cloudmicrophones.com/cloudlifter-cl-z
>
> Unfortunately it costs about $250 new, but they're available on the used
> market.
>


Those do look fun to play with. Thanks!
  #6  
Old September 15th 20, 07:45 PM posted to rec.audio.pro
slinkp
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Posts: 27
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On Tuesday, September 15, 2020 at 2:02:40 PM UTC-4, Roy W. Rising wrote:
> Some newsreaders don't include my email, so here 'tis -


Thanks Roy! I'll email you.
  #7  
Old September 15th 20, 10:12 PM posted to rec.audio.pro
Mike Rivers[_2_]
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Posts: 2,136
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On 9/15/2020 2:45 PM, slinkp wrote:

> It took some poking on archive.org but I found the article.
> It was a UA 610 preamp, did he design those? (Honest question I have no idea)


No, Paul didn't design the UA 610. My recollection was that they
performed this experiment with a preamp that Paul called Project-R,
which was published as a DIY project in a multi-part article in
Recording Magazine, back when people would build relatively complex
gadget like that preamp.

Anyway, thanks for the link to the article.

> https://web.archive.org/web/20171123...etail/330.html


> Apparently the 610 has a nominal input impedance of 2k according to the article. My Focusrite Scarlett 2i2 is even higher at 3k.
> By his formula, 600 ohms would work for me: 1 / (1/500 - 1/3000) = 600


That makes sense. The closest standard 10% value to 600 ohms is 610 ohms
- close enough, particularly since you don't know exactly what the
preamp's input impedance is, exactaly, and and at what frequency that
was measured. The idea is just to get close to a 500 ohm load across the
mic.

Oh, and as to Roy's offer - there's nothing wrong with using a pair of
XLR's with a short piece of cable between them. Just be sure you mark
the cable so you'll know what it is when you dig it out of your junk
cable box 20 years from now.

Oh, qne the genuine Male-Female barrel is the Switchcraft S3FM:

ttps://www.markertek.com/product/s3fm/switchcraft-s3fm-xlf-xlm-unwired-feed-thru-audio-adapter.


Roy's $10 offer is a better deal.


--
For a good time, call http://mikeriversaudio.wordpress.com
  #8  
Old September 15th 20, 10:35 PM posted to rec.audio.pro
geoff
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Posts: 1,688
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On 16/09/2020 2:12 am, slinkp wrote:
> I'd like to try the shunt resistor trick, as per eg. that old Paul Stamler article, but i have no idea where my soldering kit has got to, and exercising my soldering skills (terrible) is no longer on my list of "fun things to do with my very limited free time". Plugging in a presumably inexpensive thing that's already wired up and seeing if I like it does sound fun though.
>
> So if there's a place or person that sells eg. an XLR barrel with a suitable resistor already correctly wired into it, I'd happily buy one. Google's not turning up such a thing but it's hard to know exactly what to search for.
>


Ask any local electronic/TV/appliance repair place - they'd happily do
it for you for a few $$$ ( or a beer) if you turn up with the bits.

geoff
  #9  
Old September 15th 20, 10:35 PM posted to rec.audio.pro
geoff
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Posts: 1,688
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On 16/09/2020 2:35 am, Mike Rivers wrote:
> On 9/15/2020 10:12 AM, slinkp wrote:
>> I'd like to try the shunt resistor trick, as per eg. that old Paul
>> Stamler article, but i have no idea where my soldering kit has got to,
>> and exercising my soldering skills (terrible) is no longer on my list
>> of "fun things to do

>
>> So if there's a place or person that sells eg. an XLR barrel with a
>> suitable resistor already correctly wired into it, I'd happily buy one.

>
> This isn't the sort of thing that becomes a commercial product, though
> you might find some on this newsgroup or some other recording-related
> forum who will volunteer to make one for you for cost and shipping.
>
> I would, but I won't - because the 600 ohm resistor that Paul came up
> with for his article was the best compromise, as evaluated by his
> students, for the mic, preamp, and source. Different resistors sounded
> different and may sound better than 600 ohms (or no resistor) on a
> different source.
>
> The other thing - and maybe now that I think about it, it might not be a
> 600 ohm resistor after all, but a different value - is that what they
> really determined. This is the load on the microphone, which equals the
> preamp's input impedance with a resistor in parallel that total 600
> ohms. I may not have the number right, but that's the principle.
>
> Paul conducted his experiment using a preamp that he designed and built
> himself, so your preamp will be different.
>
> If you want to experiment with varying the load on a microphone, I'd
> suggest that you give some consideration to buying a Cloudlifter Z. It's
> a pre-preamp with a built-in variable load resistor. Even with the load
> resistor switched out, the Cloudlifter will make your SM57 sound better,
> and you can fiddle with the variable load to see how (and if) it affects
> what you're recording.
>
> https://www.cloudmicrophones.com/cloudlifter-cl-z
>
> Unfortunately it costs about $250 new, but they're available on the used
> market.


I used to manufacture' them for sale. I used a 750R resistor, a better
compromise I found. 600R takes the combined load Z too low.

geoff
  #10  
Old September 15th 20, 10:42 PM posted to rec.audio.pro
geoff
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Posts: 1,688
Default Does anybody sell pre-made resistor "gizmos" for sm57/58 mics?

On 16/09/2020 5:43 am, Roy W. Rising wrote:
> I can't seem to find a suitable XLR F/M barrel, how about a 2' cord with a 1% 600 ohm resistor in one end? Send me an email, it's yours for $10, including shipping. ~ Roy
>


Here's one. A bit expensive. A little googling should find one for much
cheaper.

https://www.digikey.com/product-deta...048-ND/1290432

geoff
 




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