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Are these enclosure calculations even close? lol

 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 480
Registered: Sep-04
okay these are exterior dimensions of the box...

30 inch width
18 inch height
15 inch depth
4.6875cuft

so the port will be 3.5 inches wide and 16.5 inches tall.... and have a port length of 49.62 inches...... will that give me a 24 hz tune?

im confusied i just know i want a box perfect for an ava 15 iwth a JL1000/1 and a 24hz tune lol
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 481
Registered: Sep-04
Upload
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 482
Registered: Sep-04
thats i believe a 50 inch port length

it get so confused when doing this stuff sorry lol
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 483
Registered: Sep-04
okay now i got 49.5 inch port length...grrr
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 484
Registered: Sep-04
can a port even work like that lol i think so...

and i want to coat the whole interior and exterior of the box in resin like the guy did on that site showing about the 2 chamber abc box for the 6.5s... and also i want to round the port corners with pvc and resin like he did also... i hope im not in over my head
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 485
Registered: Sep-04
oh and where should the sub be placed???
should it plit the distance between the end of the port and where the port begins...like this...

Upload
 

Silver Member
Username: Alpineuser

Winchester, TN

Post Number: 415
Registered: Mar-05
use this program

http://www.accelerator-pedal.com/l-ported-box.htm
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 486
Registered: Sep-04
i have... ive also been using another program... but the one u told me to use.. when i use it i calculate the volume myself and i always get a significantly highernumber than the program does
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 487
Registered: Sep-04
wether i do internal or external.... and what does net mean... does that mean subtracting displacement, walls and ports?
 

Silver Member
Username: Alpineuser

Winchester, TN

Post Number: 416
Registered: Mar-05
when u count the volume dont count the port volume just the internals of the box
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 489
Registered: Sep-04
oh man i did not know that... i feel like an idiot.... so dont count this gray area....



Upload
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 490
Registered: Sep-04
thats like half the volume lol
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 499
Registered: Sep-04
okay ... or tell me if this enclosure would work well with a 15 avalanche and a JL 1000/1...

go to
http://www.accelerator-pedal.com/l-ported-box.htm
for net volume put 4.6875
24Hz tuning frequency
i put .18 for displacement i dont really know
box width 40. box height 18

im realy not sure as to what volume/shape would give me the best outcome....
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 500
Registered: Sep-04
500 ...lol just had to make it to 500 posts
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 502
Registered: Sep-04
oh and that last set of specs i posted ... the program said a 2.75 in port width.. arent low tuned ports usually wider ports?
 

New member
Username: Pjcom

Currently - ... USA

Post Number: 6
Registered: Jun-05
how much of a difference does the box make? Does it make the sound quality better or does it just change the type of sound produced?
 

beerman_accelerator-pedal.com
Unregistered guest
Cool, people are using my program!

Trevor, the program determines port area based on two guidelines for minimizing port noise:

A minumum of 10 square inches per square foot, and at least a 9:1 ratio between height and width.

Port width and port height make up port area. Port area and tuning frequency determine length.

Tuning lower usually means it's going to move more air at resonance, and that might be a reason for making the port wider. 10 square inches of port area to a single cubic foot of airspace is usually enough to prevent noise in most cases, though I'm sure someone disagrees.
 

Silver Member
Username: Alpineuser

Winchester, TN

Post Number: 433
Registered: Mar-05
thanks for the program i have used it several times
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 549
Registered: Sep-04
thanks program maker... lol i feel like ur the "architech" in the matrix lol ive finally met you lmao...

PJ... the box means EVERYTHING! it determins how a sub will sound, how loud it cang et, how much power it can handle... its 20% equipment and 80% enclosure
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 550
Registered: Sep-04
but one thing no1 answered... where shud the cutout for the sub be placed on a ported box?
 

beerman_accelerator-pedal.com
Unregistered guest
I put it in the center of the "red" panel.
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