High Efficiency Speaker Asylum

Stacking them would decrease the vertical dispersion angle

12.76.233.7

Alpha Al

In Reply to: RE: EV HR9040 Triple Stacked ? ? ? posted by moray james on February 18, 2012 at 09:23:27

by a considerable amount. Horizontal dispersion would remain the sameunless they were splayed.

Follow Ups:

RE: Stacking them would decrease the vertical dispersion angle - moray james 12:25:36 02/19/12 (10)
I know that in the EV stacked set up the central horn runs full range and the two vertically flanking horns are allowed to roll off naturally in the mid range. From what I understand the vertical dispersion is maintained and horizontal would be unchanged. I would like to read the EV app notes to learn more about the idea and what happens to polar pattern control. Best regards Moray James.
moray james
- RE: Stacking them would decrease the vertical dispersion angle - dwkurfman 17:27:07 02/20/12 (9)
  Completely apples and oranges given the size and pattern control of the HR9040 but you might find the link interesting.
  - http://www.jblpro.com/pub/technote/tn_v1n07.pdf (Open in New Window)
  - RE: Stacking them would decrease the vertical dispersion angle - moray james 17:58:05 02/20/12 (8)
    dwk:rhank you for the JBL link that one has popped up a few times. it would seem to suggest contrary findings to those of the EV bulletin. While the work is decades old that does not mean it is not still sound though seeing the JBL bulletin which came out after the EV one is not a very positive I must admit. Given that it may well have been D.B. Keele came up with the triple stacking arrangement I am hot willing to write it off just yet.
    I am unclear as to why you would suggest that the size of the horn used would impact the method. I would think that it it does in fact work fairly well (and it must or EV would have never recommended it) it should work on any size horn in triples.
    moray james
    - RE: Stacking them would decrease the vertical dispersion angle - djk 23:42:15 02/20/12 (7)
      "it would seem to suggest contrary findings to those of the EV bulletin."
      Why would you think that?
      It is not even on the same subject.
      The JBL note shows three stacked horns with no aiming, and running full-range signal through them all.
      Please explain how that would be relevant to three stacked with the top horn aimed down, the bottom horn aimed up, and only the central horn with HF EQ?
      Can't you figure out that the JBL three-stack at 1Khz looks like the single horn at 8Khz?
      Can't you figure out that the JBL three-stack at 2Khz is starting to narrow and show secondary lobes because the horns are without tilt?
      Can't you figure out that the JBL three-stack at 4Khz looks like it is excessively narrowing and showing strong comb-filtering in the vertical plane?
      Can't you figure out that an EV style three-stack that rolled-off the outer horns wouldn't be narrowing excessively or have the lobes, but would in fact look like the single horn pattern at HF (because only the single central horn is running)?
      
      Edits: 02/20/12
      - RE: Stacking them would decrease the vertical dispersion angle - moray james 18:16:51 02/21/12 (6)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by djk on February 20, 2012 at 23:42:15
        
        Dennis: there are plenty of things that I can't figure out and that's why we have questions. So is this a bad day sort of response? I have no idea of how to respond to this post. I do appreciate your assistance. Time out. Best regards Moray James.
        moray james
        
        RE: Stacking them would decrease the vertical dispersion angle - djk 00:05:13 02/23/12 (5)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by moray james on February 21, 2012 at 18:16:51
        
        ""it would seem to suggest contrary findings to those of the EV bulletin."
        
        Do you understand any better now?
        
        RE: Stacking them would decrease the vertical dispersion angle - gibber 13:44:49 11/19/12 (0)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by 1907 on February 23, 2012 at 00:05:13
        
        djk, would you have the EV material mentioned in this thread?
        I'd be intersted as i run a stack of three per side.
        rgds,
        Ralph
        
        RE: Stacking them would decrease the vertical dispersion angle - Inmate51 10:17:59 02/23/12 (3)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by djk on February 23, 2012 at 00:05:13
        
        What I can't figure out is why this discussion is about JBL horns, when the question was about E-V horns.
        
        ;)
        
        RE: Stacking them would decrease the vertical dispersion angle - dwkurfman 12:24:40 02/23/12 (2)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by Inmate51 on February 23, 2012 at 10:17:59
        
        It's all my fault ;^)
        
        Since I did not know what the objective was when stacking 3 HR9040's, I provided the JBL reference.
        
        The JBL reference shows how a particular set of challenges can be overcome by stacking their flat front bi-radial horns, and the new issues that arise when stacked.
        
        Given the opportunity, the need, and the space, I would choose a horn such as the HR9040 to eliminate the reason for stacking. Or, choosing from the EV lineup, select an HR9040 rather than an HR90.
        
        RE: Stacking them would decrease the vertical dispersion angle - dwkurfman 12:31:51 02/23/12 (1)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by dwkurfman on February 23, 2012 at 12:24:40
        
        Sorry - glitch caused a premature post.
        
        I believe that stacking HR9040s (in a vertical array, firing directly forward, with identical signals) would create the same behavior JBL describes. There are ways of addressing these issues, which DJK has noted. He is far more knowledgeable on than I am.
        
        For a domestic environment, it remains unclear to me what "problem" one would attempt to address by using 3 HR9040s per side. Vertical control? Unlikely. Power handling? Unlikely.
        
        Dan
        
        RE: Stacking them would decrease the vertical dispersion angle - gibber 13:51:09 11/19/12 (0)
        
        In Reply to: RE: Stacking them would decrease the vertical dispersion angle posted by 45964 on February 23, 2012 at 12:31:51
        
        The problem to be adressed is vertical coverage angle and fixed by EV with the (inferior sounding) HPx040 series. The vertical dispersion starts to deviate from the nominal 40 deg below 2500 Hz due to insufficient vertical mouth size. There are three physical layouts possible a) all parallel firing, b) verical toe-in, c) vertical splay, of which a) and b) were treated here.

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