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JM Acoustic omni spheres
Old 6 days ago
  #1
JM Acoustic omni spheres

Hi all,

I purchased a pair of these for my KM183 pair:

https://www.shapeways.com/product/ZS...-40mm-diameter

They came today, the fit is firm but not overly so, easy to get on and off, and keep in place where you would want them. Weight is very similar to the Schoeps-brand 40mm balls I use.

I haven’t had a chance yet to plug them in and listen, but will hopefully have a chance to do that soon!

I’m attaching some photos, as they look much better in real life than on the site.
Attached Thumbnails
JM Acoustic omni spheres-911c83bb-7c18-47c3-b137-e2d20c3ecab8.jpg   JM Acoustic omni spheres-cbe6d534-d5bb-4421-a3f0-1c6965bbd897.jpg  
Old 6 days ago
  #2
Lives for gear
 
celticrogues's Avatar
 
🎧 15 years
Very cool! Looking forward to hearing your impressions of the sound.

Do they have a softer, rubbery texture, or are they hard plastic?

Thanks!
-Mike
Old 6 days ago | Show parent
  #3
Quote:
Originally Posted by celticrogues ➡️
Very cool! Looking forward to hearing your impressions of the sound.

Do they have a softer, rubbery texture, or are they hard plastic?

Thanks!
-Mike
Hard to the touch, and light, like the Schoeps branded balls, not heavy and rubbery like the DPA’s. I’ve never used a real Neumann SBK so can’t compare to those.
Old 6 days ago | Show parent
  #4
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by king2070lplaya ➡️
Hard to the touch, and light, like the Schoeps branded balls, not heavy and rubbery like the DPA’s. I’ve never used a real Neumann SBK so can’t compare to those.
I wonder if the outer surface could be made more scratch resistant by coating it with a hard enamel or varnish...like the tough clear coating applied to timber floors ? You'd have to ensure the coating didn't carry solvents which could attack and soften the surface of the sphere !

Pool/billiard ball hardness would be the desired outcome...but light reflection off a gloss finish might trouble video cameras ?

Last edited by studer58; 5 days ago at 02:24 PM..
Old 6 days ago | Show parent
  #5
0VU
Gear Addict
 
🎧 15 years
Quote:
Originally Posted by king2070lplaya ➡️
Hard to the touch, and light, like the Schoeps branded balls, not heavy and rubbery like the DPA’s. I’ve never used a real Neumann SBK so can’t compare to those.
Neumann SBKs are like the Schoeps KAs in smoothness but more like the weight of the DPAs. They're hard and comparatively heavy, with a smooth surface but without the Nextel coating found on the Schoeps. At least mine are but they might've changed since I got them.
Old 5 days ago
  #6
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fred2bern's Avatar
 
🎧 5 years
One Neumann SBK130 is 28 gr.
Old 5 days ago
  #7
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Matt Nolan's Avatar
 
🎧 5 years
Castors, lathe, drill bits, boring bar...

A less expensive solution for less expensive mics!

If you really wanted billiard ball hardness, you could start with a phenolic composite ball.
Attached Thumbnails
JM Acoustic omni spheres-ape_balls.jpg  
Old 5 days ago | Show parent
  #8
Quote:
Originally Posted by Matt Nolan ➡️
Castors, lathe, drill bits, boring bar...

A less expensive solution for less expensive mics!

If you really wanted billiard ball hardness, you could start with a phenolic composite ball.
Where do you get all those tools for less than $80?!
Old 5 days ago | Show parent
  #9
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Matt Nolan's Avatar
 
🎧 5 years
Quote:
Originally Posted by king2070lplaya ➡️
Where do you get all those tools for less than $80?!
I was fortunate enough to already have the tools. The castors were about $15 for four.

Edit: and you could do a good enough job with a pillar drill and the right sized "flat" wood drill bit. Lots of people either have something like that or know somebody who does.

Last edited by Matt Nolan; 5 days ago at 01:30 AM.. Reason: added an afterthought
Old 5 days ago
  #10
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by king2070lplaya ➡️
......the fit is firm but not overly so, easy to get on and off, and keep in place where you would want them....
When it comes to DIY spheres, this is the part that's hard to get right....
Old 5 days ago | Show parent
  #11
Lives for gear
 
MandoBastardo's Avatar
 
🎧 10 years
Quote:
Originally Posted by studer58 ➡️
When it comes to DIY spheres, this is the part that's hard to get right....
True, but if you have a 2nd tube of crazy glue handy it's easier.

I like Scott's frozen toy store rubber ball DIY spheres method. Very chic and complex, but cheap: mics for grand piano? ~$4K budget
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