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View Full Version : tuning, whats your tuned to?



jeepintn
09-04-2006, 10:03 PM
whats your box tuned to? just trying to get a general idea of what i need to tune to, i HAD my design ready for 35 hz, but now that imhaving to redesign for various reasons... it would be much easier in my app to tune to around 37, would this be too high for daily? i listen to mostly rap/hip-hop

tank65
09-04-2006, 10:04 PM
mines tuned to 32hz and i listen to mainly rap/hip-hop

danteBirosel
09-04-2006, 10:05 PM
i always love the way 32hz sound...

JimJ
09-04-2006, 10:05 PM
For your purposes, it should be fine...

ravendarat
09-04-2006, 10:06 PM
27.8 hz :)

dleccord
09-04-2006, 10:08 PM
43.102hz

jeepintn
09-04-2006, 10:32 PM
ok, i just still wanna be able to hit the lows. my problem is, after redesign, my box is 6.375 after subs displacement, and my port area is 12.5 tall x 7.25 wide... how long would that have to be for 35hz? maybe my math is wrong, but i get 139.1 inches... and with the same numbers to tune to 37 hz, its only about 37.7 inches long, am i doing this wrong?? someone PLEASE PLEASE double check me and help me out

xluben
09-04-2006, 10:41 PM
mine's tuned to 32Hz

winisd says you'd only need:
30.66" for 32Hz
24.55" for 35Hz
21.27" for 37Hz

is that right?

jeepintn
09-04-2006, 10:43 PM
mine's tuned to 32Hz

winisd says you'd only need:
30.66" for 32Hz
24.55" for 35Hz
21.27" for 37Hz

is that right?

im not sure, i have winISD and never learned how to use it. im going off what bbp is telling me...

PepsiFiend69
09-04-2006, 10:46 PM
all of mine have been tuned to 33 htz, i just always liked the way they sounded.


but i mixed it up this weekend and built a 30htz box for my new RLP, i ran outta daylight though, so i didn't get to listen to it yet :crap:

mazdakid
09-04-2006, 10:46 PM
i usually tune 32 or lower with my 18's. i just built a box for my type r 12 thats in there right now and its tuned around 33

skadude016
09-04-2006, 10:48 PM
i was at 32hz. it was pretty rad. good bottom end. Then I went to 44-45 hz and gained alot more in volume. but missed some bottom end

xluben
09-04-2006, 10:57 PM
yeah, i just did it out by hand and got 26" of actual port (for 32Hz)

winisd must automatically add in end correction (1/2 of port diameter added to the actual length)

someone please correct me if i'm wrong

bjfish11
09-04-2006, 11:01 PM
30 Hz

jeepintn
09-04-2006, 11:03 PM
yeah, i just did it out by hand and got 26" of actual port (for 32Hz)

winisd must automatically add in end correction (1/2 of port diameter added to the actual length)

someone please correct me if i'm wrong

ok, i just did it with bbp and winisd, and i thnk winisd is giving lengths given without taking out the port displacement... like i say, my box is 6.375 cubic feet after sub displacement, before port displacement...

xluben
09-04-2006, 11:07 PM
i believe that has been discussed before and winisd uses NET volume (after sub/port displacement)

kotec123
09-04-2006, 11:11 PM
5 hz

jeepintn
09-04-2006, 11:12 PM
if i lock the internal volume after port using bbp, it gives me the same lengths, thats why i theorize that winISD uses before port volumes

2loud4u
09-04-2006, 11:14 PM
35hz and will finaly get to test it out wednesday

jeepintn
09-04-2006, 11:16 PM
thanks for the replys guys, i really want to tune mine to 35hz, i just cant figure out why bassboxpro is making it so long, like 139 inches long port to do that... port experts please help... before port my enclosure is 6.375 cubes, and my port area is 12.5 x 8.. how long to tune to 35hz?

Captain_Ahab
09-04-2006, 11:20 PM
35hz here.. Gets loud and has some low end.. I love it!

LeofromtheH
09-04-2006, 11:22 PM
15 L7 @ 30 hz:yumyum:

xluben
09-04-2006, 11:45 PM
Done by hand:


This formula is also from "The Loudspeaker Design Cookbook". It tells you how long you need to make the vent.
Fb - is the 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.

http://www.carstereo.com/Images/LVFormul.gif

If you want to calculate square vents, the formula below will give you the value of R to use in the formula above.

http://www.carstereo.com/Images/SqConvrt.gif

In the formula above, a is the area of your square vent (height x width), and Pi (Pi) is approximately 3.141592.

For your box (approximated port using a round port of equal area):

12.5 * 7.25 = 90.625
sqrt( 90.625 / 3.14 ) = 5.37

Lv = ( 1.463 * 10^7 * 5.37^2 ) / ( 35^2 * 6.375 * 1728) - 1.463 * 5.37
Lv = 23.4"

Make the acutal port about 2 feet long and you're good!

Hope that helps!

jeepintn
09-04-2006, 11:48 PM
Done by hand:



For your box (approximated port using a round port of equal area):

12.5 * 7.25 = 90.625
sqrt( 90.625 / 3.14 ) = 5.37

Lv = ( 1.463 * 10^7 * 5.37^2 ) / ( 35^2 * 6.375 * 1728) - 1.463 * 5.37
Lv = 23.4"

Make the acutal port about 2 feet long and you're good!

Hope that helps!

i totally get that man, and i cant understate how much i appreciate it.. but i thought, and im a noob at these things, that once you get your length, dont u subtract that from the volume then recalculate? it just seems like calculating it using 6.375 and it giving u a length, isnt factoring in the loss of volume after adding the port...

Worlddre
09-05-2006, 12:06 AM
depending on the box im using that day
double chamber ported is tuned to 31 and 26hz

and single chamber ported is tuned to 27hz

jeepintn
09-05-2006, 12:30 AM
ttt for confusing different port help... everything gives different lengths

baseballer1100
09-05-2006, 12:33 AM
33 hz

orphe
09-05-2006, 12:34 AM
I think Im tuned around 37 -39 hz

Worlddre
09-05-2006, 12:36 AM
i totally get that man, and i cant understate how much i appreciate it.. but i thought, and im a noob at these things, that once you get your length, dont u subtract that from the volume then recalculate? it just seems like calculating it using 6.375 and it giving u a length, isnt factoring in the loss of volume after adding the port...

when designing a box you add the port to the actual box volume to to come up with the gross internal volume which should be that of the box and port together