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Horizontal Subwoofer array spacing?
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<blockquote data-quote="Jeff Hague" data-source="post: 209592" data-attributes="member: 128"><p>Hey all! Its been a while. How has everyone been?</p><p>Yes its a cross post on that other site - sorry...</p><p>I have been searching for basic information on horizontal subwoofer array spacing and have found a lot of material but so far nothing that really spells it out. I used to have a free program (that I thought I found here) that would let you place array elements with a few basic parameters and view SPL heat maps at various frequencies but have been unable to find that too.</p><p>Most of what I do is 1 or 2 ground stacks per side and rarely have the ability to center stack the subs because I need to get the tops in the air but I have a multiday outdoor event coming up and will have the resources to play with this a bit.</p><p>The stage is 32' wide and 6' tall with 5' clearance from the ground and a very flat unobstructed space to stack subs underneath. The only things in the way are the poles that support the deck.</p><p>I will have 8 SB1000z powered by 2 Itech 8000s and 8 Vertec 4888DP to work with. I am planning on stacking the 4888s, 4 per side on stacking frames, on each side of the deck itself and plan on center stacking the subs underneath - 4 stacks, 2 high.</p><p>If I stack them all right next to each other the array would be 10' wide which is essentially the same wavelength as the crossover - 100Hz. My understanding is that with that there will be little to no power alley, no discernable narrowing of horizontal coverage throughout the subs passband - 30HZ to 100Hz - and they will couple nicely.</p><p>Does that sound right?</p><p>What I would like to experiment with though is spacing the stacks - I have enough room to put as much as 3' between stacks.</p><p>3' seems really wide but I really dont know.</p><ul> <li data-xf-list-type="ul">What effect on response and horizontal coverage will spacing have - 30Hz to 100Hz?<ul> <li data-xf-list-type="ul"><br /> </li> <li data-xf-list-type="ul"></li> </ul></li> <li data-xf-list-type="ul">How do I calculate optimal spacing?<ul> <li data-xf-list-type="ul"><br /> </li> <li data-xf-list-type="ul"></li> </ul></li> <li data-xf-list-type="ul">Will I need or want to delay the outside stacks?<ul> <li data-xf-list-type="ul"><br /> </li> <li data-xf-list-type="ul"></li> </ul></li> <li data-xf-list-type="ul">Or should I stair step the outside pairs (back a ways from the inside pairs) instead of delay?</li> <li data-xf-list-type="ul"></li> </ul><p>Any help would be appreciated!</p><p>Thanks all!</p></blockquote><p></p>
[QUOTE="Jeff Hague, post: 209592, member: 128"] Hey all! Its been a while. How has everyone been? Yes its a cross post on that other site - sorry... I have been searching for basic information on horizontal subwoofer array spacing and have found a lot of material but so far nothing that really spells it out. I used to have a free program (that I thought I found here) that would let you place array elements with a few basic parameters and view SPL heat maps at various frequencies but have been unable to find that too. Most of what I do is 1 or 2 ground stacks per side and rarely have the ability to center stack the subs because I need to get the tops in the air but I have a multiday outdoor event coming up and will have the resources to play with this a bit. The stage is 32' wide and 6' tall with 5' clearance from the ground and a very flat unobstructed space to stack subs underneath. The only things in the way are the poles that support the deck. I will have 8 SB1000z powered by 2 Itech 8000s and 8 Vertec 4888DP to work with. I am planning on stacking the 4888s, 4 per side on stacking frames, on each side of the deck itself and plan on center stacking the subs underneath - 4 stacks, 2 high. If I stack them all right next to each other the array would be 10' wide which is essentially the same wavelength as the crossover - 100Hz. My understanding is that with that there will be little to no power alley, no discernable narrowing of horizontal coverage throughout the subs passband - 30HZ to 100Hz - and they will couple nicely. Does that sound right? What I would like to experiment with though is spacing the stacks - I have enough room to put as much as 3' between stacks. 3' seems really wide but I really dont know. [LIST] [*]What effect on response and horizontal coverage will spacing have - 30Hz to 100Hz? [LIST] [*] [*] [/LIST] [*]How do I calculate optimal spacing? [LIST] [*] [*] [/LIST] [*]Will I need or want to delay the outside stacks? [LIST] [*] [*] [/LIST] [*]Or should I stair step the outside pairs (back a ways from the inside pairs) instead of delay? [*] [/LIST] Any help would be appreciated! Thanks all! [/QUOTE]
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