New box design. tell me if this would be a good idea
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Gold Member Username: BestmankindLos 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: Extrmndor3Chicago, 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 |
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Gold Member Username: BestmankindLos 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: GoatinU.S.A Post Number: 801 Registered: Jan-06 | I dont understand do you mean something like this.  |
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Gold Member Username: BestmankindLos 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: BestmankindLos Angeles, CA USA Post Number: 3735 Registered: Oct-05 |  |
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Silver Member Username: GoatinU.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. |
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Gold Member Username: BestmankindLos 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. |
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Silver Member Username: John_washNashville, Tennessee Post Number: 230 Registered: Dec-05 | hey chad when r u goin to build ur new box |
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Gold Member Username: BestmankindLos 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. |
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Silver Member Username: YukhuiMyrtle Beach, South Carolina USA Post Number: 323 Registered: Jan-06 |  I think this is what he means... |
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Gold Member Username: InsearchofbassPost 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 |
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New member Username: GravestreamPost Number: 5 Registered: Apr-06 | I'd just slot the ends, you'd get a better port better airspace, and save on the effort |
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Silver Member Username: Extrmndor3Chicago, Ill Us Post Number: 520 Registered: Feb-06 | yeah but he need to make the port longer |
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Gold Member Username: BestmankindLos 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. |
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Silver Member Username: DankumPost Number: 134 Registered: Sep-05 | u should always keep subs in different chambers |
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Silver Member Username: JakeyplaysbassSt. Louis, MO Post Number: 927 Registered: Jul-05 | not always. |
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Gold Member Username: Basshead86Slowcala, FL The one that... Post Number: 2869 Registered: Aug-05 | i heard someone say once, that the pro's use single chamber......*shrugs* |
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Gold Member Username: BestmankindLos 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. |
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Silver Member Username: DankumPost 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. |
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Gold Member Username: BestmankindLos Angeles, CA USA Post Number: 3779 Registered: Oct-05 | if you have good subs and amps then you wouldn't have that problem. |
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Silver Member Username: DankumPost 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. |
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Gold Member Username: Tdeaton1021Near 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. |
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Gold Member Username: BestmankindLos 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? |
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Gold Member Username: BestmankindLos 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. |
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Gold Member Username: Tdeaton1021Near 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... |
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Gold Member Username: Tdeaton1021Near 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 |
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Gold Member Username: Tdeaton1021Near 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. |
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Gold Member Username: BestmankindLos 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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