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<blockquote data-quote="Timo Beckman" data-source="post: 42041" data-attributes="member: 1173"><p>Re: First post for me</p><p></p><p>So the only sub array that doesn't change in frequency response is a end fired line and has very good rear rejection if applied correctly (means measure it and do not think that only putting in the physical distance between loudspeakers in to the processor is enough so allways verify) .The problem with putting a endfired line in to action as a centre sub array is the space needed to build it (not enough room for it) .If you build a gradient sub array (or reversed end fired as i call it) so a double line of subs with the line in the back delayed to the front line and polarity reversed there will be a problem aligning it to your main system because in the upper x-over point the back sub line will not be in phase with your mains compared to the front line of subs .Also it sounds different from a stacked sub system and a end fired because it's out of phase in the upper region of the working area of subs .The csa array (stack of 3 with the middle sub facing to the back) also will sound a little different . The back facing sub will cancel @ the back but again has a differnt phase response @ the front comparred to the front facing subs .I have build all arrays described here above also in lines of 6 to 12 subs per line and if correctly applied they all work pretty wel .If you build them in a centre sub config. make sure it's a cardioid array otherwise you might get in to problems with the lead (talent) singer and try to get the array as far away from the stage as possible .If you have a end fired line below the stage in the centre remember that the level @ the back of the array doesn't get louder than 1 single sub . So you'll have addition in front of the array by about 14 to 15 db but the level in the back stays the same like if there was only 1 sub playing . So what will happen if you start of with a 110db level on each sub . you still have a 110 db of sub level under the stage and that might be a problem regarding feedback and the perception by the people on stage . They do not hear the mains only a lot of subs witch might be directly under them .The same thing happens with a sub line . You get directional controll but if you keep it as a single line you'll also have a lot of sub on stage . Then if you align this sub line with your mains you have to aply delay to it to get in "phase" at least in the FOH possition and by doing so the sub is also late on stage and can cause serious problems for the drummer or bass player .I do not have measurement data from live shows stored on my SIM or sat/smaart sorry..... can't help you there</p></blockquote><p></p>
[QUOTE="Timo Beckman, post: 42041, member: 1173"] Re: First post for me So the only sub array that doesn't change in frequency response is a end fired line and has very good rear rejection if applied correctly (means measure it and do not think that only putting in the physical distance between loudspeakers in to the processor is enough so allways verify) .The problem with putting a endfired line in to action as a centre sub array is the space needed to build it (not enough room for it) .If you build a gradient sub array (or reversed end fired as i call it) so a double line of subs with the line in the back delayed to the front line and polarity reversed there will be a problem aligning it to your main system because in the upper x-over point the back sub line will not be in phase with your mains compared to the front line of subs .Also it sounds different from a stacked sub system and a end fired because it's out of phase in the upper region of the working area of subs .The csa array (stack of 3 with the middle sub facing to the back) also will sound a little different . The back facing sub will cancel @ the back but again has a differnt phase response @ the front comparred to the front facing subs .I have build all arrays described here above also in lines of 6 to 12 subs per line and if correctly applied they all work pretty wel .If you build them in a centre sub config. make sure it's a cardioid array otherwise you might get in to problems with the lead (talent) singer and try to get the array as far away from the stage as possible .If you have a end fired line below the stage in the centre remember that the level @ the back of the array doesn't get louder than 1 single sub . So you'll have addition in front of the array by about 14 to 15 db but the level in the back stays the same like if there was only 1 sub playing . So what will happen if you start of with a 110db level on each sub . you still have a 110 db of sub level under the stage and that might be a problem regarding feedback and the perception by the people on stage . They do not hear the mains only a lot of subs witch might be directly under them .The same thing happens with a sub line . You get directional controll but if you keep it as a single line you'll also have a lot of sub on stage . Then if you align this sub line with your mains you have to aply delay to it to get in "phase" at least in the FOH possition and by doing so the sub is also late on stage and can cause serious problems for the drummer or bass player .I do not have measurement data from live shows stored on my SIM or sat/smaart sorry..... can't help you there [/QUOTE]
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