High Efficiency Speaker Asylum

is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn?

173.80.184.112

freddyi

I'd like to have low cabinet "talk" at low to high (100W+ peak) input power. Should central back panel to back chamber braces be employed and if so, should they have a large window area? - multiple holes? - how about the lid? - is it counterproductive to go 5/8" vs 3/4" BB trying to save a bit of weight? I can feel some back (unbraced) panel flex on my little K's made of 5/8" BB.
Karlson Evangelist

Follow Ups:

RE: is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn? - RCA-fan 14:06:44 09/15/15 (5)
Yes, brace back to horn interior.

Just make the top double thick.

You can use a D120, or a jbl 2206 12".... A very nice overlooked driver.

Bill

PS no stuffing
- RE: is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn? - BofService 11:54:11 09/16/15 (0)
  Bill Fitzmaurice's designs prove you can build just about anything out of 5/8" with the proper construction techniques and bracing. Usually there is no need for bracing "windows" except to reduce weight.
  - http://billfitzmaurice.com/ (Open in New Window)
- RE: is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn? - lokie 08:20:41 09/16/15 (0)
  What about a B&C 12pe32?
  
  What's the upper crossover point?
  
  Thanks
- RE: is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn? - Scholl 04:18:34 09/16/15 (0)
  I like the smaller size and simplicity.
  
  How low would it go sitting on top of subwoofers 60cm to 1 m off the floor in a large room away from walls?
  
  I'm looking more for a mid-bass "hit box" than bass bin.
  
  Thanks!!
  
  Scott
- RE: is 5/8" Baltic birch sufficient for RCA-Fan's 70Hz horn? - freddyi 14:43:25 09/15/15 (1)
  thanks! - according to hornresp kludge, Kappa12a would work in a pinch (?) can the trapezoid braces be solid w/o holes/windows? - I assume needs also to run to the bottom.
  Karlson Evangelist
  - bracing. horn.... - RCA-fan 16:45:30 09/15/15 (0)
    No holes, but connect it to the bottom.
    
    We never used this box, but I was surprised how smooth and how high it went.
    Of course the is zero directivity.
    
    Let me know how you make out.
    Bill

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