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Half-cardioid boundary room mic pair - XY or spaced?
Old 3rd April 2021
  #1
Here for the gear
 
Half-cardioid boundary room mic pair - XY or spaced?

I got a pair of beyerdynamic installation boundary mics for almost nothing. They’re made for putting into holes drilled in boardroom tables and the like, but I’m gonna try installing them in a wood panel and use for room mics. The trouble is I’m not sure how to configure them. XY means I can use a smaller boundary panel, and seems the logical place to start. If I go spaced, I need to drill holes in the boundary - how far apart? ORTF is an easy choice I guess... and with a hemispherical/omni I’d put the holes in the middle, but I presume with cardioid I can put them at the back of the panel to take maximum advantage of the boundary panel size?
Any advice?
Thanks!
Old 4 weeks ago
  #2
Lives for gear
 
Bob Ross's Avatar
 
🎧 15 years
Quote:
Originally Posted by Bugsmasher ➡️
XY means I can use a smaller boundary panel
How do you figure? LF response is impacted by boundary size regardless of how proximate one mic is to its stereo partner.

fwiw back in the day when PZMs were the shiney new toy on the block the standard home-brew DIY stereo array consisted of a 4x8 sheet of plywood cut in half and joined with piano hinge. Mount the two boundary mics centered on the edge nearest the hinge. Splay the two boundaries 90° apart, boom! you've got an XY array. Collapse the two boundaries (i.e., 0° apart, so folded flat as if for transport) and now you've got a Jecklin Disc of sorts. If you mount the mics with velcro you can have alternate locations closer to the center of each panel, allowing for ORTF and a more legit Jecklin Disc approximation.

They were heavy and impractical AF, but they sounded pretty decent and they were cheap. Nowadays I'd see if I could use sheets of plexiglass or composite, something lighter than plywood.
Old 4 weeks ago
  #3
Lives for gear
 
🎧 10 years
Try hanging one on the chest of the drummer. If they don't move too much.
Old 4 weeks ago
  #4
Here for the gear
 
How do you figure? LF response is impacted by boundary size regardless of how proximate one mic is to its stereo partner.

I wasn’t smart enough to think of splitting the boundary in 2/ making it foldable, so thought that with more distance between mics I’d have to have a bigger boundary. Thanks for pointing out!
Old 4 weeks ago | Show parent
  #5
Here for the gear
 
Quote:
Originally Posted by Bugsmasher ➡️
How do you figure? LF response is impacted by boundary size regardless of how proximate one mic is to its stereo partner.
I wasn’t smart enough to think of splitting the boundary in 2/ making it foldable, so thought that with more distance between mics I’d have to have a bigger boundary. Thanks for pointing out!
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