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Old 3rd June 2020
  #5
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Quote:
Originally Posted by voodoo4u View Post
Yes, of course, perforated metal. This is exactly what I'm looking for. Thank you very much Avare.
you are welcome. Please note that I referenced using the equations. By lower frequencies, as we are discussing, it maybe more economical to drill holes in plywood, etc. Even with the relatively low amount of holes it is still tedious. Layer the panels to reduce the number of operations of drilling.