DIYAPASON-L Digest #187 - Wednesday, November 15, 2000
 
Re: The Organ Room...
  by "Larry Chace" <rlc1@etnainstruments.com>
flutes, slots, haskell basses
  by "Brian  Graham" <briangraham@sunflower.com>
 

(back) Subject: Re: The Organ Room... From: "Larry Chace" <rlc1@etnainstruments.com> Date: Wed, 15 Nov 2000 10:46:30 -0500   John Haskey asked for more details regarding room dimensions and their relative values. Looking back at the PIPORG-L archives, there are some interesting articles there.   Searching for the subject "acoustics and architecture", the following 3 articles by Douglas Purl have lots of detail: 3187, 3239, and 4354.   Searching for the subject "improving acoustics", the following article by Tim Tikker discusses a home-buildable dispersion wall: 31906.   The following URL will take you to the PIPORG-L search facility:   http://listserv.albany.edu:8080/archives/piporg-l.html   In an attempt to (over?)simplify the comments by Doug Purl, I'd say the following: you can determine the resonant frequency by dividing 550 by the =   distance (in feet) between two parallel walls. If you do that for each of =   the 3 pairs of surfaces in a "box", you can compare the frequencies; include their integer multiples as well. If the frequencies "cluster", then you'll get an uneven response. If they spread out well (logarithmically), then you'll get an even response. Non-parallel walls behave differently!   Larry Chace          
(back) Subject: flutes, slots, haskell basses From: "Brian Graham" <briangraham@sunflower.com> Date: Wed, 15 Nov 2000 22:21:42 -0000   Thanks to all for the flute replies!   After further reflection and experiment, I think I know one of the major reasons why the Stopped Diapason was added to the organ.   ALL of the open stops, including the flutes, are slotted, giving them a somewhat "horn"ey sound. The Stopped Diapason is a nice contrast to that type of tone.   For you Haskell experts out there (and you know who you are L.C.), I've noticed recently that the Melodia basses (haskell, wood pipes with metal "qualifying tubes") are quite slow to speak. Is this usual, or is there some adjustment that needs to be made?   -Brian