In order to graduate box building you must....

pwnt by pat · 01-03-07, 02:45 AM

Know your ABCs

3 cubes @ 30.5/61hz

GreekPower · 01-03-07, 02:53 AM

i wonder wat car thats going in

jimmer · 01-03-07, 02:59 AM

you really into this stuff huh? man...I would LOVE to get a tuned box

hehehe..whoops its dark man...and late for me

dual tuned WHAT??????

pwnt by pat · 01-03-07, 03:01 AM

Fet into this stuff?

Heh... A dual tuned tri-port enclosure. Aperodic Bi-Chamber

Telion · 01-03-07, 03:11 AM

ABC's and I believe the Thiel Small calculations (theory) is it?

pwnt by pat · 01-03-07, 09:05 AM

Aperodic Bi-Chamber

but yeah

pwnt by pat · 01-04-07, 03:44 PM

Got a couple hours to build today.

All the sides are attached to the rear. All I have to do is router the holes for the ports, attach the center piece and attach the top and that's it.

I would be done today, but I have to go to a viewing for my bosses son. I found out he passed away new years eve. I'm dedicating this build to him.

Maybe when I get back.

bl420 · 01-04-07, 05:23 PM

elmers probond glue... and MDF ftmfw... !!!!

hahaha jk
..

nice box...

pwnt by pat · 01-04-07, 06:01 PM

I'm definately thinking a nice dark and deep walnut stain to really bring out the birch grain.

GreekPower · 01-04-07, 06:21 PM

it will sound good in the legend

pwnt by pat · 01-05-07, 02:33 AM

pwnt by pat · 01-05-07, 10:40 AM

Please excuse the burn marks around the woofer hole... MY jasper 200 decided to be a pos and broke and I my jigsaw bit is ready to bite the dust, figuratively. Also, that last pic, dunno what happened. I have no viewfinder on my camera - broken - so I couldn't tell...

pwnt by pat · 01-05-07, 11:45 AM

Oh yah, and all those darker brown spots.... That's water from wiping up extra glue. It dries nicely. That or it's silicone to ensure an extra-nice seal.

Blackend · 01-05-07, 12:47 PM

So explain it to us that don't have a PhD in MDF

What is the purpose of having the separate smaller chamber on the right? Also, why do the ports extend so far? Is that for tuning?

pwnt by pat · 01-05-07, 04:46 PM

That wood actually isn't MDF. It's Birch Ply. It's 2/3 the weight of MDF and probably about 2/3 times stronger than MDF. It costs twice as much though and it easily splinters.

A normal ported box has one chamber and one to infinity ports. The "port area" of the port determines the length of the port. Whenever you change the number of ports, the port length increases (hence the long ports).

EX:
A 3 cubic foot box (mine here) with one 3" port (what I'm using) would require a port length of 4.85 inches to achieve a tuning frequency of 30 hz (what I'm using). Adding a second port increases the port length to 11.89".

As for the second chamber, in an Aperodic Bi-Chamber, or more properly a Dual Chamber Bass-Reflex, enclosure, the volume of the box is split into a 2:1 ratio where the larger chamber holds the woofer. Primary tuning is achieved through the first chamber port. A second tuning frequency is achieved by the second chamber and connecting port. Different sources state that the second tuning frequency as a result of the smaller chamber doubles the primary tuning frequency. Other sources say it's the first frequency * 1.9.

Either way, the second tuning frequency doesn't help so much in output, as it does to flatten the response curve and aid in cone control, allowing more power

The theory can be taken to add a third chamber, resulting in a chamber ratio of .5:.33:.16 or 3:6,2:6,1:6 and again, adding another tuning frequency. It can be carried out indefinately with size being the only limitation. That and design and constructure complexity.

Also, as to design theory, I have heard theories that at low levels of excursion, the ABC enclosure's third port and second chamber acts to lengthen the main tuning frequency allowing for extended low frequency response. At high excursion levels, it changes to functioning like a higher tuned box, for more spl... Kind of like vTec for speaker boxes.

01-03-07, 02:45 AM	#1 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	In order to graduate box building you must.... Know your ABCs 3 cubes @ 30.5/61hz

01-03-07, 02:59 AM	#3 (permalink)
jimmer DemonWolf Join Date: Mar 2006 Location: Phoenix baby! Posts: 2,883 Car 1: Infiniti i30T t=touring Car 2: Legend coming! iTrader: (1)	you really into this stuff huh? man...I would LOVE to get a tuned box hehehe..whoops its dark man...and late for me dual tuned WHAT?????? __________________ http://i35.photobucket.com/albums/d1...korruptsig.jpg Last edited by jimmer : 01-03-07 at 03:12 AM.

01-03-07, 03:11 AM	#5 (permalink)
Telion Of the Telion Chip Join Date: Feb 2006 Location: Hopefully In your ECU ;) Posts: 4,482 Car 1: White 91 KA8 5spd W/3.5, TII Cams & Manifold Car 2: White 91 KA8 JDM TII iTrader: (41)	ABC's and I believe the Thiel Small calculations (theory) is it? __________________ \/Provider of The Telion Chip click here\/ http://telionsite.com or search Telion Chip 3.5, TII cams,pnp mani & springs,Telion Chip,HID's,H&R's/Koni's,Addco Sway bars,TII calipers,RH C2's,R.J. shifter,DV8 EGR plate,CAI,OBX headers,2.5" exhaust,hi-flow cat,K2 muffler,Stage III clutch,S&D rotors, KVR pads, blackend damper, a CF hood, AFC NEO, 3.5 Aluminum pulley, & Web cams. C&R Racing radiator and more to come.

01-04-07, 05:23 PM	#8 (permalink)
bl420 Dont Catch Join Date: Sep 2004 Location: Bogata, Lima Posts: 4,815 Car 1: 1991 Sedan iTrader: (16)	elmers probond glue... and MDF ftmfw... !!!! hahaha jk .. nice box... __________________ Anti Alpine Type-R Thread

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01-03-07, 02:53 AM	#2 (permalink)
GreekPower Banned Join Date: Aug 2005 Location: Pittsburgh,PA Posts: 10,458 Car 1: 1992 Acura L"S" Sedan Car 2: 1991 3/S Turbo's 2x Car 3: 2005 Grand Prix iTrader: (13)	i wonder wat car thats going in

01-03-07, 03:01 AM	#4 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	Fet into this stuff? Heh... A dual tuned tri-port enclosure. Aperodic Bi-Chamber

01-03-07, 09:05 AM	#6 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	Aperodic Bi-Chamber but yeah

01-04-07, 03:44 PM	#7 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	Got a couple hours to build today. All the sides are attached to the rear. All I have to do is router the holes for the ports, attach the center piece and attach the top and that's it. I would be done today, but I have to go to a viewing for my bosses son. I found out he passed away new years eve. I'm dedicating this build to him. Maybe when I get back.

01-04-07, 06:01 PM	#9 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	I'm definately thinking a nice dark and deep walnut stain to really bring out the birch grain.

01-04-07, 06:21 PM	#10 (permalink)
GreekPower Banned Join Date: Aug 2005 Location: Pittsburgh,PA Posts: 10,458 Car 1: 1992 Acura L"S" Sedan Car 2: 1991 3/S Turbo's 2x Car 3: 2005 Grand Prix iTrader: (13)	it will sound good in the legend

01-05-07, 02:33 AM	#11 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)

01-05-07, 10:40 AM	#12 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	Please excuse the burn marks around the woofer hole... MY jasper 200 decided to be a pos and broke and I my jigsaw bit is ready to bite the dust, figuratively. Also, that last pic, dunno what happened. I have no viewfinder on my camera - broken - so I couldn't tell...

01-05-07, 11:45 AM	#13 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	Oh yah, and all those darker brown spots.... That's water from wiping up extra glue. It dries nicely. That or it's silicone to ensure an extra-nice seal.

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01-05-07, 04:46 PM	#15 (permalink)
pwnt by pat custom box builder Join Date: Nov 2006 Location: 16066 Posts: 116 iTrader: (0)	That wood actually isn't MDF. It's Birch Ply. It's 2/3 the weight of MDF and probably about 2/3 times stronger than MDF. It costs twice as much though and it easily splinters. A normal ported box has one chamber and one to infinity ports. The "port area" of the port determines the length of the port. Whenever you change the number of ports, the port length increases (hence the long ports). EX: A 3 cubic foot box (mine here) with one 3" port (what I'm using) would require a port length of 4.85 inches to achieve a tuning frequency of 30 hz (what I'm using). Adding a second port increases the port length to 11.89". As for the second chamber, in an Aperodic Bi-Chamber, or more properly a Dual Chamber Bass-Reflex, enclosure, the volume of the box is split into a 2:1 ratio where the larger chamber holds the woofer. Primary tuning is achieved through the first chamber port. A second tuning frequency is achieved by the second chamber and connecting port. Different sources state that the second tuning frequency as a result of the smaller chamber doubles the primary tuning frequency. Other sources say it's the first frequency * 1.9. Either way, the second tuning frequency doesn't help so much in output, as it does to flatten the response curve and aid in cone control, allowing more power The theory can be taken to add a third chamber, resulting in a chamber ratio of .5:.33:.16 or 3:6,2:6,1:6 and again, adding another tuning frequency. It can be carried out indefinately with size being the only limitation. That and design and constructure complexity. Also, as to design theory, I have heard theories that at low levels of excursion, the ABC enclosure's third port and second chamber acts to lengthen the main tuning frequency allowing for extended low frequency response. At high excursion levels, it changes to functioning like a higher tuned box, for more spl... Kind of like vTec for speaker boxes.