General SPL General discussion of Sound Pressure Level topics.

3 12" Kicker L5's Or 2 15" L5's

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Old 03-19-2006, 11:01 PM
  #21  
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i could try
when you say maximum spl are you thinking of entering comps? or just a really loud daily driver
by any chance do you have the t/s parameters for that sub?
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Old 03-19-2006, 11:05 PM
  #22  
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just a really loud daily driver and the occasional comp here and there. i found all the specs for the sub here

http://www.kicker.com/06/tech-suppor...b%20Manual.pdf
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Old 03-19-2006, 11:13 PM
  #23  
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should work well in a ported box. i see the maual suggest a 3 cf box and a 5 but they dont tell you what they are tuned to lol. ill take more of a look into in tomorrow run it thorugh some program...
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Old 03-19-2006, 11:16 PM
  #24  
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yeah i noticed that as well..25hz maybe? that would be great if ya could help me out i appreciate it! anyways im off to bed got work at 8, thx dude
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Old 03-20-2006, 07:02 AM
  #25  
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they are tuned to about 30hz for the large box and 32 for the small
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Old 03-20-2006, 11:41 AM
  #26  
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hmmmm 30hz should be decent
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Old 03-20-2006, 04:02 PM
  #27  
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...

Originally Posted by hofulstrof
the question was basic, so was my reply


ok lets do some math

to find the cone area of 3 12" square subs
x=(12*12) 3
x=(144) 3
x=432 sq"
to find the area of 2 15" square subs
y=(15*15) 2
y=(225) 2
y= 450 sq"

x<y assumeing both subs have the same x max but the difference will only be noticalbe on a mic and not by your ears

there are other things to talk into account the box and what the final resistance of the 3 subs will be.

also 2 subs is almost always cheaper than 3
You really don't know what you are talking about. The three 12s will almost assuredly be louder (of course it does depend on the box being resonably well designed). There are a few reasons for this...first Kicker L5 15s really really suck and their 12s and 10s are pretty darn good woofers (its a design thing, the design just works very poorly in the larger size woofer possibly due to the very loose suspension)...that aside you are not taking into account the fact that three woofers has 50% more motor than two woofers to give more magnetic force and also 50% more spiders than two woofers which will keep it more linear and 50% more coils than two woofers so it will handle power better. Also a 12" cone is much stiffer than a 15" cone, if you looked at the total amount of flex of the cones of all the woofers the 3 12s cones combined would flex less than the two 15" cones combined...all that would throw off your "more cone area is louder" theory because there are way more variables than cone area when you are talking less vs. more woofers (especially in this case where the cone area is so close to being the same).
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Old 03-20-2006, 04:09 PM
  #28  
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hahahahahah go Tom go!!! dude u are the best
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Old 03-20-2006, 04:12 PM
  #29  
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oh and P.S. the 12s will also work better in a Jimmy because with 4 15s you can't design a box that will be as good in a jimmy as a box that you could build for 3 12s. Jimmys (and most SUVs) like boxes with the woofers pointing up and the ports sticking out the outside of the box and pointing backwards. T/S parameters mean nothign, box programs will tell you that the bigger the box the better which is also not true at all. In reality those 12s will be loudest in around 1.75 cubic feet each with 2 4" aeroports per woofer...its a very commonly used box in SPL and is very loud. Bigger boxes are NOT better. In fact you get quite a bit louder by making the box smaller. I assume that your Jimmy is like many GM vehicles which have 40" between the wheel wells. This works well with 3 12s as you can line them all up in a straight line. This is better than what you can do with a 15 because with 4 15s your only options are to have them two across and two rows or to do a wall...if you are gonna do a wall then 15s would be just fine but if you plan to do a standard box the 15s closest to the front will not give much to the design because of the extremely poor acoustics that a woofer in that location in that vehicle will give. you really want the woofers about a two feet from the back or so (not the 4-5 feet that the second two 15s would be which would kill their output acoustically speaking)...further than that will give you serious SPL losses in such a box. You really need to talk to someone who knows what they are doing and not most of the people on here (with the exception of Arok who I beleive does know a whole lot)
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Old 03-20-2006, 04:14 PM
  #30  
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i cant believe this post went on for 3 pages untill someone spoke some sense. Tom u need to come around more, someone has to cut the bullshit before it s far and wide.
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