• A follow-up: On the other hand... - Inmate51 14:59:42 02/07/06 (1)
  In Reply to: Building a basement room from scratch: What to do about lally post? posted by Jeff P. on January 23, 2006 at 12:28:17:

  ...there is research which shows that a cylindrical object, such as a post, casts an acoustic shadow which can be significant at frequencies which are comparable or smaller than the diameter of the post. In the case of a 4" post, this would be at frequencies above about 3300 Hz.

  As a result, even though it doesn't affect the overall room acoustics, it certainly does affect the sound quality in a specific direction which is in line with the source and the post.
  
  
  

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  • That's why those are cheaper seats. (NT) - Kal Rubinson 19:56:58 02/07/06 (0)
    In Reply to: A follow-up: On the other hand... posted by Inmate51 on February 7, 2006 at 14:59:42:

    
    
    
    

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• Re: Building a basement room from scratch: What to do about lally post? - Conductor 21:59:03 02/01/06 (0)
  In Reply to: Building a basement room from scratch: What to do about lally post? posted by Jeff P. on January 23, 2006 at 12:28:17:

  I have almost exactly the same size room and post location. It kinda bothered me at first, but now I realize that it has zero effect on the acoustics and I just ignore it. I hardly notice it now, It is just there, like wallpaper. As long as it doesnt get in the way of where you might want to place a listening chair, it will be no problem.
  
  

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• Re: Building a basement room from scratch: What to do about lally post? - Inmate51 14:48:42 01/23/06 (3)
  In Reply to: Building a basement room from scratch: What to do about lally post? posted by Jeff P. on January 23, 2006 at 12:28:17:

  Assuming a typical support post of four or five inch diameter, and hollow, it won't affect the acoustics of the room, but it MAY "ring" enough to bother you while recording or listening, depending on the situation and the tone being played. My guess is that it will only be a problem in very specific musical situations, at which time you'll say "why didn't I wrap that stinkin' post!".

  Rap on it with your fisted knuckles and listen. Hit a tom-tom and listen. Try a range of frequencies on a trombone and a trumpet. If the ringing is louder than you can accept, just wrap it tightly with some foam insulation and duct tape. For a more pleasing appearance, do like Ethan said and wrap some fabric around it. Maybe colored duct tape. ;)
  
  
  

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  • Re: Building a basement room from scratch: What to do about lally post? - Aristée 19:06:18 01/24/06 (0)
    In Reply to: Re: Building a basement room from scratch: What to do about lally post? posted by Inmate51 on January 23, 2006 at 14:48:42:

    I had a similar problem in my home theater/listening room. The post was right in the middle of a 12'X17' room. Not very good for movie viewing. The post was supporting one of the main beams on the ceiling of the basement. I consulted an expert and he advised me to just take it off and move it in the wall I was constructing, in the 12' width. So there is about 12 feet of beam without a post. The beam is made of 6 2X10" and is very dry, so it won't budge.

    Hope this helps...

    Hugo
    Jonquière, Québec
    
    

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  • Re: Building a basement room from scratch: What to do about lally post? - maneil@fuse.net 10:20:12 01/24/06 (0)
    In Reply to: Re: Building a basement room from scratch: What to do about lally post? posted by Inmate51 on January 23, 2006 at 14:48:42:

    one nice idea is to wrap it in hemp rope glue the post and wind the rope around it start at the bottom and go up.You can use a thick rope 1 inch should be good .I have the same proplem and that is what I am going to do . My room 16.5 X 23 X 8.3 the drywall is just being taped as I write this 10 inch's of insulation in the ceiling covered in a fabric of some sort. My post is also next to where My chair will be oh well.
    
    

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  • Re: Building a basement room from scratch: What to do about lally post? - Jeff P. 15:08:28 01/23/06 (0)
    In Reply to: Re: Building a basement room from scratch: What to do about lally post? posted by Inmate51 on January 23, 2006 at 14:48:42:

    Thanks for the ideas and advice. I was definitely planning on wrapping the post in some way, if for no other reason than to make it look better (I do want the room to be as aesthetically pleasing as possible). A tight layer of insulation followed by some kind of fabric that will blend into the decor seems to make sense (I'll skip the duct tape though, despite the lovely rainbow of colors that's available!).
    
    

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• Re: Building a basement room from scratch: What to do about lally post? - Ethan Winer 13:15:06 01/23/06 (1)
  In Reply to: Building a basement room from scratch: What to do about lally post? posted by Jeff P. on January 23, 2006 at 12:28:17:

  Jeff,

  > So what would be less acoustically disastrous <

  A pole that's only 4 or 5 inches in diameter is hardly a problem acoustically because it's too small to reflect very much. Even if it does reflect some sound toward you, all you need to do is wrap it with fiberglass or thick cotton batting, and cover that with heavy fabric.

  --Ethan
  
  

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  • Thank you! - Jeff P. 13:41:57 01/23/06 (0)
    In Reply to: Re: Building a basement room from scratch: What to do about lally post? posted by Ethan Winer on January 23, 2006 at 13:15:06:

    Thanks, Ethan. That certainly sounds feasible, and it seems to make sense.

    All the best,
    Jeff
    
    

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