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Tuning frequencie 12, and 15?


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Alpine Guy 
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Posted: February 10, 2004 at 7:43 PM / IP Logged  

Im doing an install with 2 12"s and 2 15"'s  in one vehicle.   I tryed to talk the guy outa doing it, but he wants it.  So im going to run the 2 12"s at 50-80hz , and the 15" 50hz down.   I was just wondering what i should frequencie you guys reccomend porting the box's too?

IM useing 2 cerwin vegas, 12"...i don't know the model/     and 2 alpine r-15"s.  The r-15\"s are going to get about 3-4 cubes each,

forbidden 
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Posted: February 10, 2004 at 8:12 PM / IP Logged  

Tune the port on the 15's to around 38-24 hz, it really does not matter too much here. Make sure that you have a subsonic filter on the 15's. I too would not mix these driver sizes, he will get much better results with 4 drivers of all the same size, especially if he steps up to better capabilty subs. It sounds like he just wants to get loud, I think he is on the wrong track, but if it's what he wants and will pay for, so be it.

Top Secret, I can tell you but then my wife will kill me.
customsuburb 
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Posted: February 10, 2004 at 8:48 PM / IP Logged  
Really, you should just stick with something like four 15s if he wants loud. I dont understand why anyone would want anything more then two 15s unless he is doing it for SPL (and dosnt mind losing his hearing).
spl_enterprise 
Copper - Posts: 62
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Posted: February 10, 2004 at 10:17 PM / IP Logged  
or 2 10" subs tuned higher up for mid-bass in a sealed enclosure and the 2 15" subs tuned low ported for good depth, extension, and a true sub freq. but the problem with this is setting it up so the drivers dont cancel each other out.
Pete - SPL Enterprise Inc.
Alpine Guy 
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Posted: February 10, 2004 at 10:53 PM / IP Logged  
Should i port the 12"s ??  there getting the same amount of power as the 15's., , so probably not.
thapimpfromchi 
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Posted: February 11, 2004 at 12:46 AM / IP Logged  
since u mentioned it forbidden, what is a subsonic filter?
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ksin291 
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Posted: February 11, 2004 at 7:47 AM / IP Logged  

A subsonic filter is a circuit that either comes on an amp or sound processor that eliminates lower frequencies that we can't hear from being reproduced, it helps protect your subs (especially in ported enclosures) and saves your amp from wasting a ton of power which makes the amp more efficient. They are usually adjustable and come on most new mid-range and up amps, especially class d's which are meant to push subs.

dcgc 
Copper - Posts: 78
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Posted: February 11, 2004 at 8:40 AM / IP Logged  
Also: It protects the speaker(S) from excessive excursion below box tuning in ported box.
It is less necessary in sealed boxes, but can still help protect the speakers.
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Alpine Guy 
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Posted: February 11, 2004 at 11:59 AM / IP Logged  
whell, the system slams!!, left box's sealed.
forbidden 
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Posted: February 11, 2004 at 12:56 PM / IP Logged  
Good job dude!
Top Secret, I can tell you but then my wife will kill me.
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