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Old 12-12-2015, 03:16 PM
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Default need to know the basics about enclosure design

so to start i have never built a box always have paid somebody else to do it but truth be told i'm never happy with the out come.

im not here to blast anyone nor start an argument simply trying to understand the basics .

1st on my list is how to figure out tune , i have heard some tune gross box and some tune off the net .
for example i have a box that is 48w x 24 tall x 25.5 deep .75 wood single baffle all around 1.75 total displacement 3 common walls subs up port towards trunk total port area is 45 "l x 4.5 tall x20" deep . box builder swears its tuned to 34-35 when i punch in the program i get 40-41hz .

2nd question is how does amount of port affect area effect subs ? i have heard people use a lot of port vs some use little .

im after a daily build that can play across the board and do a decent number as well but main goal is to play music. i don't mind trial and error simply trying to understand how it all works .


thanks cal
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Last edited by caloriu; 12-12-2015 at 03:28 PM.
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Old 12-12-2015, 03:38 PM
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From what I understand the more port area the less bandwidth.The general rule of thumb is 12-16 for slot ports and 7-12 for aero "True aero ports" with flares and I think for circle ports like regular pvc without flare its the same rule of thumb as the slot ports I might be wrong tho but let's see what others say.
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Old 12-12-2015, 03:41 PM
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Originally Posted by Turn it up View Post
From what I understand the more port area the less bandwidth.The general rule of thumb is 12-16 for slot ports and 7-12 for aero "True aero ports" with flares and I think for circle ports like regular pvc without flare its the same rule of thumb as the slot ports I might be wrong tho but let's see what others say.
does the amount of port area affect the subs themselves as in power handling ?
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Old 12-12-2015, 03:44 PM
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Im sure someone else will chime in, but there isnt any box calculator that you will get the same specs for the same design. Also you sub will play below tuning frequency just gotta be careful of unloading to much and bottoming out. That all depend how much power you have.

Also im never happy even talking to another box builder or designer. They always how a rule of thumb and there preferences. They ask how much power and cehicle and music you play, but then use torres box calculator which doesnt even show your mechanical or electrical parameter to see if your exceeding them. Every box and design should be custom to its sub, vehicle and music genre. There and equation for port area in the tuning frequency you want.
I forgot but you need the cone area times xmax i believe. No box builder use that shit. They do 14sq inch of port area per cuft which is alrite most time, but that not being custom to your sub and etc.
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Old 12-12-2015, 04:03 PM
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Quote:
Originally Posted by caloriu View Post
does the amount of port area affect the subs themselves as in power handling ?
More port area reduces box net volume.
If box volume is getting smaller then recommended volume then it will have better handling of more power.

The bigger the net volume is the less power you will be able to use as it can cause the sub to bottom out or extend to max xmax.

Sent from my Z970 using Tapatalk
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Old 12-12-2015, 07:51 PM
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Originally Posted by SPL Addict View Post
Im sure someone else will chime in, but there isnt any box calculator that you will get the same specs for the same design. Also you sub will play below tuning frequency just gotta be careful of unloading to much and bottoming out. That all depend how much power you have.

Also im never happy even talking to another box builder or designer. They always how a rule of thumb and there preferences. They ask how much power and cehicle and music you play, but then use torres box calculator which doesnt even show your mechanical or electrical parameter to see if your exceeding them. Every box and design should be custom to its sub, vehicle and music genre. There and equation for port area in the tuning frequency you want.
I forgot but you need the cone area times xmax i believe. No box builder use that shit. They do 14sq inch of port area per cuft which is alrite most time, but that not being custom to your sub and etc.
1 agree with u 100 % .
see i went to my builder gave him my goals and let him do his thing . i never seen him or any oth the guys i use even look at speaker parameters or anything. he uses a basic formula like u said that works most of the time . im looking for more of a box made for my car and based off my subs.

im not really one of those guys who like to push power at subs for no reason if they can get loud off lee means more reliable to me.

as of now this box does a 153.5 constant but issue is subs need a lot of power and cant take rated . not going to blasts any company im just trying to figure this out
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Old 12-12-2015, 07:53 PM
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Originally Posted by Los33 View Post
More port area reduces box net volume.
If box volume is getting smaller then recommended volume then it will have better handling of more power.

The bigger the net volume is the less power you will be able to use as it can cause the sub to bottom out or extend to max xmax.

Sent from my Z970 using Tapatalk
as of now subs are with in the recommended enclosure just can't take rated power for more than 2 songs straight at best.
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Old 12-12-2015, 08:02 PM
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Originally Posted by caloriu View Post
as of now subs are with in the recommended enclosure just can't take rated power for more than 2 songs straight at best.
What type of music are you playing?

Is your amp clipping?

You possibly dont have enough power on tap to keep the amp happy..

Are the coils smelly?

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Old 12-12-2015, 08:06 PM
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Originally Posted by Los33 View Post
What type of music are you playing?

Is your amp clipping?

You possibly dont have enough power on tap to keep the amp happy..

Are the coils smelly?

Sent from my Z970 using Tapatalk

try to stay close to tune so 35-45 hz.
plenty of power on tap 96 caps set gains very conservative , set gain @ 13.9 volts and max voltage drop is 13.4 full tilt


coils get stinky . and trust me its not from clipping can only get 2 songs max at full tilt.

also will add that if i play a song that voltage stays @ 14.2 the subs will still stink after 2 songs. so either its box design or subs cant take rated power for long
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Old 12-12-2015, 08:07 PM
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Bigger boxes for lower power smaller boxes when overpowered. I prefer more area on lower power and less on more for flatter response musically. The port part tho is more subjective to enviroment
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