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New box design. tell me if this would be a good idea

 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3732
Registered: Oct-05
i know the drawing kinda sux but i just want to get an idea. the center piece is the port. i figured having the port stick out the box would give me more cuft inside the box.

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Silver Member
Username: Extrmndor3

Chicago, Ill Us

Post Number: 508
Registered: Feb-06
i think u need to put another mdf on each chamber cuz that port is too small and i think u want a slot ported right
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3733
Registered: Oct-05
okay i am sure when i go to tune the box the size of the port will be different. the drawing is not to scale. its a rough sketch of the idea i have. from each box there will be an opening at the bottom and meet in the center.

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Silver Member
Username: Goatin

U.S.A

Post Number: 801
Registered: Jan-06
I dont understand do you mean something like this.
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Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3734
Registered: Oct-05
okay let me explain a little better. it will be 2 separate boxes. the blue thing is the external port. the box will fire up.



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Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3735
Registered: Oct-05
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Silver Member
Username: Goatin

U.S.A

Post Number: 803
Registered: Jan-06
Well if they are both on the same mono amp I would think so.
But I would add a partition but thats just me I only have 3 boxs under my belt so far.
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3761
Registered: Oct-05
nvm. i've decided to go with pvc port box. the slot port takes up too much space in the box. if i was to tune it to like 28hz or 30hz it needs to be long. that means it would take alot of space inside the box.
 

Silver Member
Username: John_wash

Nashville, Tennessee

Post Number: 230
Registered: Dec-05
hey chad when r u goin to build ur new box
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3764
Registered: Oct-05
i am gonna start this weekend. i am going to take my time though. i am gonna just do little by little everyday cause i am too lazy to do it all at once.
 

Silver Member
Username: Yukhui

Myrtle Beach, South Carolina USA

Post Number: 323
Registered: Jan-06
Upload

I think this is what he means...
 

Gold Member
Username: Insearchofbass

Post Number: 4777
Registered: Jun-04
Colby's example illustrates Chad's idea best I think but you could also do a pvc wrap around (external) like Ive posted on this forum before from someone elses website
 

New member
Username: Gravestream

Post Number: 5
Registered: Apr-06
I'd just slot the ends, you'd get a better port better airspace, and save on the effort
 

Silver Member
Username: Extrmndor3

Chicago, Ill Us

Post Number: 520
Registered: Feb-06
yeah but he need to make the port longer
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3767
Registered: Oct-05
yeah like lilrob said. that port is too short to be tuned to around 30hz. thats why i am going with 2 3" diameter pvc pipe in each chamber. the slot port will reduce the cuft inside too much. a 3 cuft box will have just about little over 2 cuft after the slot port displacement and the driver displacement.
 

Silver Member
Username: Dankum

Post Number: 134
Registered: Sep-05
u should always keep subs in different chambers
 

Silver Member
Username: Jakeyplaysbass

St. Louis, MO

Post Number: 927
Registered: Jul-05
not always.
 

Gold Member
Username: Basshead86

Slowcala, FL The one that...

Post Number: 2869
Registered: Aug-05
i heard someone say once, that the pro's use single chamber......*shrugs*
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3774
Registered: Oct-05
hey guys i just want to make sure of one thing. if i were to build a box with 2 3" pvc pipe ports, then i just calculate the port with a 6" diameter and take half of the length of that right? meaning 2 3" diameter by 13" length is same as 1 6" diameter by 26" length.
 

Silver Member
Username: Dankum

Post Number: 147
Registered: Sep-05
Yes the pros do it, but when u put more than one sub in one chamber the subs have to be playing exactly the same, if one falls behind or quits all together your gonna have problems. The reasons for keepin subs seperate far out weigh the resons not to.
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3779
Registered: Oct-05
if you have good subs and amps then you wouldn't have that problem.
 

Silver Member
Username: Dankum

Post Number: 150
Registered: Sep-05
lol do what u want bro, im just tellin u how it is. the quality doesnt really have ne thing to do with it. its hard to match subs that r in the same chamber. not only that but seperating them would add another brace. i could keep goin, but u obviously have your mind made up. good luck.
 

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 2566
Registered: Sep-04
chad, dont calaculate that way or you will screw up your entire design lol. first of all, having 2 ports is different than having one in a single chamber. when you have 2 ports each one is tuned to half the volume of the chamber, or something like that. but 2 3 inch ports DO NOT equal 1 6 inch port. 2 3 inch ports have a port area of 14.13 cq inches. a single 6 inch port as a port area of 28.26 sq inches. so >4< 3 inch ports equal a single 6 inch port. to be honest i dont think 2 3 inch ports is large enough. id go with 2 4 inch ports, flared.
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3781
Registered: Oct-05
okay trevor maybe you can calculate it for me then. i will be building a 2.5 cuft per chamber box. i want 2 ports each chamber. so how long do i need to make each ports if they are 4 inch ports?
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3782
Registered: Oct-05
o by the way billy bob, i am going to build a separate chamber cause i will be building a box for each sub.
 

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 2571
Registered: Sep-04
okay i'll calculate that in a minute. i thought u were doing 1 chamber and 2 3 inch ports. that would have been far off. if its for each chamber then 2 3 inch pports may be okay. a good rule of thumb is 10sq inches for every 1cuft but ive seen plenty of great installs who dont completely follow it. steve mead did an install for his wife with 2 12 MTs and 2 4 inch flared ports so that has to say something... but okay im going to calculate this now... im assuming you want 2.5net unless you say otherwise...
 

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 2572
Registered: Sep-04
WITH (2) 3 INCH PORTS IN A 2.5 CUFT NET-30HZ
14.74 inches long. (each tube) port disp- appx .13 cuft

WITH (2) 4 INCH PORTS IN A 2.5 CUFT NET- 30HZ
27.18 inches long (each tube) port disp- appx .4cuft





 

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 2573
Registered: Sep-04
http://www.carstereo.com/help/articles.cfm?id=31
thats what i used. if you dont want 2.5 net than just keep adjusting your port size and find the difference between the port disp. and the volume. also make sure to include driver disp.
 

Gold Member
Username: Bestmankind

Los Angeles, CA USA

Post Number: 3783
Registered: Oct-05
yeah thats the site i use all the time. but they only have the calculator for one port. thats why i was wondering how i would go about calculating two ports.
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