hello
Replies (20)
kirchatndftbl on 03/27/2008 08:14:48
http://support.alpine-usa.com/products/documents/OM_SWR-1222D.PDF
swez on 03/27/2008 18:22:40
Good start, but we are the only 2 guys that really understand the plan.
OK... I would not recommend one large box and 2 Alpine's w/o separate chambers for your friend. Why? Because he is a bit harsh on his gear and if only 1 chamber were used for both subs, if one fails, the other one will fail in short order. Here, the safety net is one box, dual chambers and each chamber has its own port. (I could do it and be fine) But, your buddy is way too hard on his gear right now and we need to protect him from his own lack of knowledge.
In a ported scenario, each sub chamber has a Vb of 1.3 ft^3 + sub and port displacements. (1.7 ft^3/chamber) If you elect to go vented, each sub should have it's own dedicated chamber and vent or port.
Finally, are you planning to cut the MDF panels on your own or have others cut to panels for you're project?
Swez
raulbustos on 03/28/2008 00:40:14
okay if swez says so i trust your judgement and understand the reason
so lets see if i have the right vision
so build a box divided in the middle to an internal vol of 1.7ft^3/ chamber
in the middle place the vent next to the board in the center for each sub kinda like
http://www.subzoneusa.com/hd-12v.htm
and i will be making the cuts on a table saw probably
swez on 03/28/2008 04:58:56
Yes, that SubZone box is the right idea and a good template to use as your guide to builbing this new box for your buddy.
Also, the link that Kirch noted gived the optimal dimensions for the SWR series subs. Take a close look at it as all the key details are there and you can design off the parameters noted on that link. (Page 4 gives the box and vent parameters)
The external measurments are: (1 chamber)
Chamber" 18" W x 13.5" H x 16.5" D
Vent: 12" H x 1.25" W x 21.0" L
Quote from Crutchfield:
Recommended Vented Box Volume: The vented box sizes recommended by Alpine range from 0.75 cu/ft to 2.0 cu/ft. Within this range, the ideal size recommended by Alpine is 1.7 cu/ft, so this is the enclosure recommended by Crutchfield. A slot port with the following dimensions should be used with the 1.7 cu/ft enclosure: W = 12", H = 1.25", L = 21". If you cannot use a slot port in your enclosure, you will need a port tube with the following dimensions: Diameter = 3", L = 9.9".
http://www.crutchfield.com/App/Product/Item/Main.aspx?g=520&i=500SWR1222&tp=111&tab=detailed_info
Got all that now?
Swez
raulbustos on 03/28/2008 12:52:07
all rite so lets see if we use those demensions now correct me if im worng but by my first draft of this box we could use a box that is :
now i assumed these were internal dimensions of the chamber so
accounting mdf with a thickness of .75 (i will meassure when i get the board to make sure exact width)
a box that outside dimmensions is 38.25w X 13.5h X 18d
with a board in the middle issolating each chamber
and a port for each chamber thiat is 12h X 1.25w X
(now for the lenght im going to have to make the port like a L right?)
15.25 and then maintaing the 1.25width of the port 5 to make 21 long port
swez on 03/29/2008 17:54:04
I have not forgotten you Raul. This has been a hectic few days and I will answer and guide you when I have more time available.
You have the basics right, but a few minor tweaks are in order. Will try to work out the details and feed you more info this weekend.
Swez
raulbustos on 03/29/2008 21:01:35
all rite dont worry great knowledge is allways worth waiting for :)
swez on 03/30/2008 03:44:26
Raul,
It depends on how we assemble a box. The external dimensions and thickness of MDF will determine the inner dimensions as noted in the Alpine specifications. The internal dimensions of each chamber are what count most!
Most guys use the top and bottom panels as overlapping dimensions as you have done. (18" x 2 = 36" W) plus the divider panel and minus the end caps. 36" + 0.75 = 36.75 - 1.5 = 35.25" W. (internal) is the correct target and external is 36.75.
The "Height" is 13.5" externally, so we need 12.0" for the front/back and side panels. The wood thickness is subtracted so the net internal H = 12.0 (This is the same "H" dimension for your ports as well.) Clever huh? LOL
The Depth here is 16.5 externally. Again, we subtract the wood thickness of 1.5 to get the "internal dimension" of 15.0 for Depth.
When we tally up each chamber, we are left with an internal dimension of 1.7 ft^3 per chamber.
Now, the ports are 12" High and 1.25" Wide and 21" Long. Since the length of the port is longer than the internal Depth, we'll use an "L" type port for each chamber to achieve the proper port length. Here are your port dimensions:
Panel A is: 12" H x 13.75" D & 3/4" Thickness
Panel B is : 12" H x 7.25" L - 3/4" T = 6.5" L (Butt joint here)
NOTE: We need to maintain the 1.25" port width for the entire length of the port. (From divider panel and rear panel distances as well)
I'll let you chew on these dimensions for a moment and then we can discuss the panel cutting, fitment and port fabrication on the next phase of this post.
Swez COFFEE
PS It would be good to make a drawing of this box w/ dimensions so that you have every element fixed in your mind before cutting panels, setting the panels in place and the glue/screw strategy to use for this box.
raulbustos on 03/31/2008 14:39:25
now this is one of those things that i can never seem to remember but how do you get the volume of a box
i remember some thing like (H)(D)(W)/? i think its some thing like that
Victor on 03/31/2008 15:17:25
HDW dimensions in inches....
can be converted to cu.ft on dividing by 1728....
and volume in cu.ft can be converted to liters on multiplying by 28.31 .....
1728 cu.in = 1 cu.ft = 28.31 ltr.
GRIN 1 ltr = 1000 cu.cm
1cu.cm = 1000000 cu.mm GRIN
Exercise 1 : What would be the volume ( in cu.nm ( cubic. nanometer )) of a box whose dimensions are...
18.73" x 15.92" x 23.27" ..???
HINT : 1 cu.mm = 1.0 x 10^24 cu.nm
GRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRIN
swez on 04/2/2008 02:24:09
Are you making any sense of all this input Raul?
Swez
raulbustos on 04/8/2008 18:10:22
well lets see
4cu.ft
113.68 liters
1.1368 x10^35 nm
raulbustos on 04/9/2008 13:09:01
well lets see
4cu.ft
113.68 liters
1.1368 x10^35 nm
yes i understand and make plenty of cents 7 a day actually :)
swez on 04/11/2008 15:50:37
OK, so you have a solid math background. Any progress on the box enclosure plans to date?
Swez
raulbustos on 05/16/2008 13:38:46
well hello school is out and i am free. been prety busy so lets see now im ready i think
okay i sat down and chewed and then re chewed and then discovered
so then back to chewing and then again chewing
so i made a design and while checking the internal vol i found i think a small problem
ok let see if i can explain in words
looking from the top of the box down
a base board with 3 panels making two seperate chambers and a front and back so the top and bottom sit on top of these boards
each chamber has an internal chamber 16.5W X 15 D X 12 H
okay the problem i found is the board in the middle seperating the two chambers. okay lets see two chambers 16.5 internally=33 plus the 3 boards to make the sides and center 2.25
so 33+2.25=35.25
so if i am rite on that this box should do the ticket
external dimentions:
35.25W 16.5 D 13.5 H
internal chamber dimentions
16.5W 15D 12 H
with a L shaped port
21L 12H 1.25 W
panel a 13.75 L12H
panel b 6.5 L 12 H
what do yu think
swez on 05/17/2008 10:11:18
If I read your info correctly, you have 1.72 cf per chamber with the inner dimensions noted. (16.5 x 15 x 12 = 2970/1726 = 1.718 cf) That's pretty much in the pocket and good enough for jazz.
The total length of the port will depend on how you joint the "L" part to the main panel of the port. Your numbers show it to be correct when accounting for the 3/4" board thickness. (Additive butt joint)
FYI: Since you have the divider board and integrated ports, there should be little or no need for internal bracing. The (0.02 cf per chamber) overage is minimal and should not have any notable affects. Don't even consider changing a thing.
Swez
raulbustos on 05/18/2008 00:32:33
so then its set in cut board
ill let you know how it comes out
raulbustos on 05/27/2009 10:54:41
why hello there my old friends well this project went under for a while you know the economy and all but i did finish the box but it still hasent been instaled but i talked to him yesterday and i think hes allmost ready again
swez on 05/27/2009 12:35:44
Has he tested the woofer and amp yet? Even it's not installed, he can still hook up some basic wires and test the Bass Engine in or out of the vehicle.
When testing outside the vehicle, the deep lows will come through as we move away from the woofer. The upper bass punch may be a little light as there is not cabin gain factor to help lift the dB's in the 55-70 Hz., range. Onced installed and the woofer has broken in, it should sound full and solid if the box was build as stated earlier.
Swez
raulbustos on 05/31/2009 08:28:09
well he is using the woofers now with an 800rms amp i think but the box and new amp have never been used we are getting ready to order the front and rear speakers and continue the project
Replies (20)
kirchatndftbl on 03/27/2008 08:14:48
http://support.alpine-usa.com/products/documents/OM_SWR-1222D.PDF
swez on 03/27/2008 18:22:40
Good start, but we are the only 2 guys that really understand the plan.
OK... I would not recommend one large box and 2 Alpine's w/o separate chambers for your friend. Why? Because he is a bit harsh on his gear and if only 1 chamber were used for both subs, if one fails, the other one will fail in short order. Here, the safety net is one box, dual chambers and each chamber has its own port. (I could do it and be fine) But, your buddy is way too hard on his gear right now and we need to protect him from his own lack of knowledge.
In a ported scenario, each sub chamber has a Vb of 1.3 ft^3 + sub and port displacements. (1.7 ft^3/chamber) If you elect to go vented, each sub should have it's own dedicated chamber and vent or port.
Finally, are you planning to cut the MDF panels on your own or have others cut to panels for you're project?
Swez
raulbustos on 03/28/2008 00:40:14
okay if swez says so i trust your judgement and understand the reason
so lets see if i have the right vision
so build a box divided in the middle to an internal vol of 1.7ft^3/ chamber
in the middle place the vent next to the board in the center for each sub kinda like
http://www.subzoneusa.com/hd-12v.htm
and i will be making the cuts on a table saw probably
swez on 03/28/2008 04:58:56
Yes, that SubZone box is the right idea and a good template to use as your guide to builbing this new box for your buddy.
Also, the link that Kirch noted gived the optimal dimensions for the SWR series subs. Take a close look at it as all the key details are there and you can design off the parameters noted on that link. (Page 4 gives the box and vent parameters)
The external measurments are: (1 chamber)
Chamber" 18" W x 13.5" H x 16.5" D
Vent: 12" H x 1.25" W x 21.0" L
Quote from Crutchfield:
Recommended Vented Box Volume: The vented box sizes recommended by Alpine range from 0.75 cu/ft to 2.0 cu/ft. Within this range, the ideal size recommended by Alpine is 1.7 cu/ft, so this is the enclosure recommended by Crutchfield. A slot port with the following dimensions should be used with the 1.7 cu/ft enclosure: W = 12", H = 1.25", L = 21". If you cannot use a slot port in your enclosure, you will need a port tube with the following dimensions: Diameter = 3", L = 9.9".
http://www.crutchfield.com/App/Product/Item/Main.aspx?g=520&i=500SWR1222&tp=111&tab=detailed_info
Got all that now?
Swez
raulbustos on 03/28/2008 12:52:07
all rite so lets see if we use those demensions now correct me if im worng but by my first draft of this box we could use a box that is :
now i assumed these were internal dimensions of the chamber so
accounting mdf with a thickness of .75 (i will meassure when i get the board to make sure exact width)
a box that outside dimmensions is 38.25w X 13.5h X 18d
with a board in the middle issolating each chamber
and a port for each chamber thiat is 12h X 1.25w X
(now for the lenght im going to have to make the port like a L right?)
15.25 and then maintaing the 1.25width of the port 5 to make 21 long port
swez on 03/29/2008 17:54:04
I have not forgotten you Raul. This has been a hectic few days and I will answer and guide you when I have more time available.
You have the basics right, but a few minor tweaks are in order. Will try to work out the details and feed you more info this weekend.
Swez
raulbustos on 03/29/2008 21:01:35
all rite dont worry great knowledge is allways worth waiting for :)
swez on 03/30/2008 03:44:26
Raul,
It depends on how we assemble a box. The external dimensions and thickness of MDF will determine the inner dimensions as noted in the Alpine specifications. The internal dimensions of each chamber are what count most!
Most guys use the top and bottom panels as overlapping dimensions as you have done. (18" x 2 = 36" W) plus the divider panel and minus the end caps. 36" + 0.75 = 36.75 - 1.5 = 35.25" W. (internal) is the correct target and external is 36.75.
The "Height" is 13.5" externally, so we need 12.0" for the front/back and side panels. The wood thickness is subtracted so the net internal H = 12.0 (This is the same "H" dimension for your ports as well.) Clever huh? LOL
The Depth here is 16.5 externally. Again, we subtract the wood thickness of 1.5 to get the "internal dimension" of 15.0 for Depth.
When we tally up each chamber, we are left with an internal dimension of 1.7 ft^3 per chamber.
Now, the ports are 12" High and 1.25" Wide and 21" Long. Since the length of the port is longer than the internal Depth, we'll use an "L" type port for each chamber to achieve the proper port length. Here are your port dimensions:
Panel A is: 12" H x 13.75" D & 3/4" Thickness
Panel B is : 12" H x 7.25" L - 3/4" T = 6.5" L (Butt joint here)
NOTE: We need to maintain the 1.25" port width for the entire length of the port. (From divider panel and rear panel distances as well)
I'll let you chew on these dimensions for a moment and then we can discuss the panel cutting, fitment and port fabrication on the next phase of this post.
Swez COFFEE
PS It would be good to make a drawing of this box w/ dimensions so that you have every element fixed in your mind before cutting panels, setting the panels in place and the glue/screw strategy to use for this box.
raulbustos on 03/31/2008 14:39:25
now this is one of those things that i can never seem to remember but how do you get the volume of a box
i remember some thing like (H)(D)(W)/? i think its some thing like that
Victor on 03/31/2008 15:17:25
HDW dimensions in inches....
can be converted to cu.ft on dividing by 1728....
and volume in cu.ft can be converted to liters on multiplying by 28.31 .....
1728 cu.in = 1 cu.ft = 28.31 ltr.
GRIN 1 ltr = 1000 cu.cm
1cu.cm = 1000000 cu.mm GRIN
Exercise 1 : What would be the volume ( in cu.nm ( cubic. nanometer )) of a box whose dimensions are...
18.73" x 15.92" x 23.27" ..???
HINT : 1 cu.mm = 1.0 x 10^24 cu.nm
GRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRINGRIN
swez on 04/2/2008 02:24:09
Are you making any sense of all this input Raul?
Swez
raulbustos on 04/8/2008 18:10:22
well lets see
4cu.ft
113.68 liters
1.1368 x10^35 nm
raulbustos on 04/9/2008 13:09:01
well lets see
4cu.ft
113.68 liters
1.1368 x10^35 nm
yes i understand and make plenty of cents 7 a day actually :)
swez on 04/11/2008 15:50:37
OK, so you have a solid math background. Any progress on the box enclosure plans to date?
Swez
raulbustos on 05/16/2008 13:38:46
well hello school is out and i am free. been prety busy so lets see now im ready i think
okay i sat down and chewed and then re chewed and then discovered
so then back to chewing and then again chewing
so i made a design and while checking the internal vol i found i think a small problem
ok let see if i can explain in words
looking from the top of the box down
a base board with 3 panels making two seperate chambers and a front and back so the top and bottom sit on top of these boards
each chamber has an internal chamber 16.5W X 15 D X 12 H
okay the problem i found is the board in the middle seperating the two chambers. okay lets see two chambers 16.5 internally=33 plus the 3 boards to make the sides and center 2.25
so 33+2.25=35.25
so if i am rite on that this box should do the ticket
external dimentions:
35.25W 16.5 D 13.5 H
internal chamber dimentions
16.5W 15D 12 H
with a L shaped port
21L 12H 1.25 W
panel a 13.75 L12H
panel b 6.5 L 12 H
what do yu think
swez on 05/17/2008 10:11:18
If I read your info correctly, you have 1.72 cf per chamber with the inner dimensions noted. (16.5 x 15 x 12 = 2970/1726 = 1.718 cf) That's pretty much in the pocket and good enough for jazz.
The total length of the port will depend on how you joint the "L" part to the main panel of the port. Your numbers show it to be correct when accounting for the 3/4" board thickness. (Additive butt joint)
FYI: Since you have the divider board and integrated ports, there should be little or no need for internal bracing. The (0.02 cf per chamber) overage is minimal and should not have any notable affects. Don't even consider changing a thing.
Swez
raulbustos on 05/18/2008 00:32:33
so then its set in cut board
ill let you know how it comes out
raulbustos on 05/27/2009 10:54:41
why hello there my old friends well this project went under for a while you know the economy and all but i did finish the box but it still hasent been instaled but i talked to him yesterday and i think hes allmost ready again
swez on 05/27/2009 12:35:44
Has he tested the woofer and amp yet? Even it's not installed, he can still hook up some basic wires and test the Bass Engine in or out of the vehicle.
When testing outside the vehicle, the deep lows will come through as we move away from the woofer. The upper bass punch may be a little light as there is not cabin gain factor to help lift the dB's in the 55-70 Hz., range. Onced installed and the woofer has broken in, it should sound full and solid if the box was build as stated earlier.
Swez
raulbustos on 05/31/2009 08:28:09
well he is using the woofers now with an 800rms amp i think but the box and new amp have never been used we are getting ready to order the front and rear speakers and continue the project
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