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  #1  
Old 01-15-2015, 07:51 PM
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Default 6th order box help

looking at possibly building a 6th order box for my 10" ssa xcon..

first of all i would like to know how you figure port area needed when building such an enclosure. for a standard vented box i show i need around 35" at 30hz
more at higher hz obv.

if i use this Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES and use the bandpass option i would need a box the size of my car in order to tune it low enough... clearly theirs something im missing ?

i have roughly 4 maybe 5 cubes i can work with would love to hear some input
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Old 01-15-2015, 08:36 PM
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Do about 1 cube tuned around 40hz for the rear chamber with 35-40" of port area and 3 cubes front side tuned around 25hz with 70-80" of port area. This is for a series tuned 6th so woofer and port on rear section would both fire into the front chamber.
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Old 01-15-2015, 09:48 PM
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You don't want the front section tuned lower. The front section acts as an acoustic low pass filter, so if you tune the front lower than the rear you won't have much output.

It's actually the low-pass effect of the front port that let's you use smaller ports in the rear chamber, as the chuffing is masked.

If you have 5 ft^3, do about 1-1.5 in the rear with about 15 in^2 of port It's still going to be a huge port though, probably ~40" in length if you tuning in the high 20's. However, that's still less than 0.5 ft^3 of port volume which isn't terrible, just a PITA to make as you'll probably have to fold it. You can make the rear port external to the rear chamber so that it takes up more space in the front chamber. It's far more important to get your rear chamber built correctly and not too small rather than worry about gain from a high ratio enclosure for listening to music. After that use whatever space you have leftover in the front chamber for your higher tuning. This is assuming a single driver and a series bandpass configuration.

Last edited by SPLEclipse; 01-15-2015 at 09:51 PM.
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Old 01-15-2015, 10:02 PM
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Quote:
Originally Posted by e46inperrycounty View Post
Do about 1 cube tuned around 40hz for the rear chamber with 35-40" of port area and 3 cubes front side tuned around 25hz with 70-80" of port area. This is for a series tuned 6th so woofer and port on rear section would both fire into the front chamber.

tuning and size looks decent however with that amount of port area im looking at 90" of port for the front chamber ??
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Old 01-15-2015, 10:09 PM
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Quote:
Originally Posted by SPLEclipse View Post
You don't want the front section tuned lower. The front section acts as an acoustic low pass filter, so if you tune the front lower than the rear you won't have much output.

It's actually the low-pass effect of the front port that let's you use smaller ports in the rear chamber, as the chuffing is masked.

If you have 5 ft^3, do about 1-1.5 in the rear with about 15 in^2 of port It's still going to be a huge port though, probably ~40" in length if you tuning in the high 20's. However, that's still less than 0.5 ft^3 of port volume which isn't terrible, just a PITA to make as you'll probably have to fold it. You can make the rear port external to the rear chamber so that it takes up more space in the front chamber. It's far more important to get your rear chamber built correctly and not too small rather than worry about gain from a high ratio enclosure for listening to music. After that use whatever space you have leftover in the front chamber for your higher tuning. This is assuming a single driver and a series bandpass configuration.

I wasn't thinking of firing the rear chamber into the front chamber making it series. Im fairly new to the world of bandpass and from what i have learned so far i definitely want to stick with 6th order because of my sub.

as Stated i have without any displacement calculated about 14x25x32 external dimensions gives me a gross of 5.18ft
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Old 01-15-2015, 10:17 PM
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The front chamber will be tuned higher than the rear, usually about an octave higher. If you tuned for say 30hz in the rear chamber, the front would be tuned to 60hz. Because of the higher tuning (And generally larger chamber in the front), you shouldn't need much port length.

Can you post a picture or give me a link to what kind of enclosure you're trying to build? I'm not sure we're on the same page, but you may be talking about a parallel 6th.
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Old 01-15-2015, 10:26 PM
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Shyte, yes, big chamber with more port area is the high tuned section. I'm half asleep, been a rough week. I try to use 1/3-1/4 cone area for rear chamber port area and 2 rear port area for the front port area to keep compression and port velocities where they should be. Series tuned will hide some port noise, but not all of it especially if you have too high of port velocities in the rear chamber. You'll also want to keep the rear port from firing directly out the front port if doing external rear, offset it so it loads on the front chamber loading wall if doing external. Aeros will be more efficient but probably more difficult to fit for the rear chamber. Maybe a slot rear and aero front?
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Old 01-15-2015, 10:30 PM
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Do not do an exact octave between tuning though. It does not work well in a series tune. Creates a big dip in midband response where both sections are in steep roll off. Close to full octave works better than full octave. 25-40, 28-50, 30-55, ect...
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Old 01-15-2015, 10:31 PM
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Quote:
Originally Posted by SPLEclipse View Post
The front chamber will be tuned higher than the rear, usually about an octave higher. If you tuned for say 30hz in the rear chamber, the front would be tuned to 60hz. Because of the higher tuning (And generally larger chamber in the front), you shouldn't need much port length.

Can you post a picture or give me a link to what kind of enclosure you're trying to build? I'm not sure we're on the same page, but you may be talking about a parallel 6th.
yes was thinking parallel as in two separate ports firing externally.
you are talking about the rear port firing into the front port which then fires together externally correct ?

I dont have a pic as im not sure exactly how i plan to design it yet and whats going to yield the better results as in higher spl.
If you guys feel series will net better results than i will go that route

Last edited by matj1990; 01-15-2015 at 10:34 PM.
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Old 01-15-2015, 10:37 PM
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If you are doing the build for SPL primarily, keep the tunings even closer together and close to where your car peaks for the high side tuning. Best case would be if your car peaks at 42hz for example, tune rear side to 35 and front side to 45 so both ports are working their efficiency range at your cars peak. This will not be a musical enclosure, but it will be really peaky and do the SPL job very well.
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