how to figure tuning of my box?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=113649
Printed Date: May 03, 2024 at 9:57 PM
Topic: how to figure tuning of my box?
Posted By: bumpinexploder
Subject: how to figure tuning of my box?
Date Posted: May 06, 2009 at 10:49 PM
ok so i got a prefab box for my audioque sd 2.5 15's. its 2.3 cubes per chamber with port and sub displacement. now we knocked out the L part of the port so now its just a straight slot port. it gave it a 1 db gain for spl. I did a 149.5 at 54 Hertz. now i have the port dims i just cant seem to find a formula to tell me what the frequency of the box is. dims are 15 high x 1.6 wide x 16 deep.
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Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Replies:
Posted By: vibrationcustum
Date Posted: May 06, 2009 at 11:22 PM
what are dims of the box? i can tell you what it is tuned to if i know this
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Can't be loud then don't have it.
(power acoustik system)
Head unit- TID-896 7" TOUCHSCREEN
ovn1-5500d 09 and another one coming soon
4-12" mofos 12ft3 box to 40hz (wall)
2 batterys, 1 power
Posted By: bumpinexploder
Date Posted: May 07, 2009 at 3:53 PM
dims are 36.25 wide x 16.25 tall x 17.5 deep. dual chambered. 5/8 wood. i got 4.97 cubes for the whole box so each chamber is 2.485. and when u figure out the tuning will you inform me hjow you did it so i can do it next time i have this problem. thanks
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Posted By: kenwood_nut
Date Posted: May 07, 2009 at 5:03 PM
I can't tell you how to tune it, but all I CAN say is that I'm jealous! Sounds your subs are going to shatter some bones! When I last used a ported Q-Logic box, I just called Crutchfield where I got the box, and got their answer. Then I called Kenwood and asked them since they were Kenwood subs. Both Kenwood & Crutchfield has the same answer for how long to cut the port down to. This time I went with a sealed box, so I won't be worrying about ports. Man, a pair of 15's? I envy you. There was once a dude in a Suzuki Samorai that used to drive by the auto repair shop I worked at, which was right on a main street, and every time he was coming down the street, thing on our walls would shake. When he got closer, things on our shop benches would vibrate, as would our tools boxes and our bones! You could feel his bass from across the street. Finally one day he pulled into the little mini mart across the street. My boss said "Go find out what he has for subs!", so I did. I almost wet myself when he showed me! He had 6 (yes, SIX) of those huge Cerwin-Vega 5000-watt 15-inch Stroker subs, with each one being driven by a seperate Precision Power A-1200 amp!!! All that in the back of a Samurai. That didn't include all the MB Quarts he had elsewhere. Man, I can feel the bass just thinking about how hard his pounded. Good luck with your port tuning job! -------------
Posted By: bumpinexploder
Date Posted: May 07, 2009 at 5:22 PM
thanks alot man. funny thing is ppl will really be jealous when i pull a 152 next week outta a prefab box! lol
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Posted By: vibrationcustum
Date Posted: May 09, 2009 at 9:34 PM
Tuning a ported box:
your box is tuned to 37hz if you have 2 ports at the 1.6 wide but if this is one port then it is 25hz
To tune a ported box to a desired frequency, use the following equation:
LV= [(1.463 x 10^7 x R^2) / (Fb^2 x Vb)] - 1.463xR
Fb - is the desired tuning frequency of your enclosure in Hertz.
Lv - is the length of your port in inches.
R - is the inside radius of your vent tube.
Vb - is the internal volume of your enclosure in cubic inches. To convert cubic feet to cubic inches, multiply by 1728.
Hope this works for you. good luck with 152 it took me 5 years to get to where i am at. Good luck
-------------
Can't be loud then don't have it.
(power acoustik system)
Head unit- TID-896 7" TOUCHSCREEN
ovn1-5500d 09 and another one coming soon
4-12" mofos 12ft3 box to 40hz (wall)
2 batterys, 1 power
Posted By: bumpinexploder
Date Posted: May 09, 2009 at 10:03 PM
well i found that formula today and i got 37. but i peak on the TL at 54 hertz? no way my car has a 17 hertz rise right? it doenst play music hardly either so it cant be 37 i thought. but yea 152 will have to wait. i only did 151.5 today :( little more work and ill get it.
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Posted By: vibrationcustum
Date Posted: May 10, 2009 at 12:05 AM
mine is tuned to 40hz and on the TL it was 55hz. i figured that the size of port you gave me was per side but you are never sure. All ways do it both ways jut in case right. TL like to read high hz for some reason, i did notice that my self. Well sorry if I did not help. zhope you get you numbers
-------------
Can't be loud then don't have it.
(power acoustik system)
Head unit- TID-896 7" TOUCHSCREEN
ovn1-5500d 09 and another one coming soon
4-12" mofos 12ft3 box to 40hz (wall)
2 batterys, 1 power
Posted By: soundnsecurity
Date Posted: May 10, 2009 at 11:32 AM
bumpinexploder wrote:
well i found that formula today and i got 37. but i peak on the TL at 54 hertz? no way my car has a 17 hertz rise right? it doenst play music hardly either so it cant be 37 i thought. but yea 152 will have to wait. i only did 151.5 today :( little more work and ill get it.
does that prefab box have any bracing inside it? if not you might want to add a brace on the larger sides and that could give you a little extra output. -------------
Posted By: bumpinexploder
Date Posted: May 10, 2009 at 1:36 PM
yea you did confirm that i was doin the formula right but i dont know why it says its so low tuning. but yes thanks for the help. and no the box has no bracing. i just fiberglass resined the inside and out of it and ripped the carpet off to resin and spray paint it white for better looks lol
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Posted By: DYohn
Date Posted: May 10, 2009 at 3:28 PM
... so it's not really a pre-fab enclosure, it;s a pre-fab enclosure that you have heavily modified.  ------------- Support the12volt.com
Posted By: bumpinexploder
Date Posted: May 10, 2009 at 4:06 PM
lol yes. i will add some more pics to the rides and system gallery when i finish the box. i swear i have changed that system like 5 times lol. but yes it is very heavily moddified. i didnt have one built custom because the prefab barely fit and we had to cut the back deck to get it to fit so its already the biggest box i can fit. i got it free from my friend when i bought them audioques
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
Posted By: vibrationcustum
Date Posted: May 10, 2009 at 6:31 PM
longs as it loud and works keep it.
-------------
Can't be loud then don't have it.
(power acoustik system)
Head unit- TID-896 7" TOUCHSCREEN
ovn1-5500d 09 and another one coming soon
4-12" mofos 12ft3 box to 40hz (wall)
2 batterys, 1 power
Posted By: bumpinexploder
Date Posted: May 10, 2009 at 9:03 PM
lol thats what im sayin!
-------------
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
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