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1/2 in port width ok?


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armymp90099 
Copper - Posts: 76
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Joined: July 05, 2009
Location: Illinois, United States
Posted: October 05, 2009 at 6:07 PM / IP Logged  
hey guys if i had to make my port width 1/2 in would that be ok? it seems really narrow but i dont know if that will affect the sound at all.
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DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: October 06, 2009 at 11:38 AM / IP Logged  
It might be OK.  What's the other dimensions?  How large is the enclosure?  What is the woofer and what kind of power is the system seeing?  The down side of a small port is it can create audible noise if its too small (and of course it changes the resonant frequency but I assume you know that.)
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armymp90099 
Copper - Posts: 76
Copper spacespace
Joined: July 05, 2009
Location: Illinois, United States
Posted: October 06, 2009 at 12:52 PM / IP Logged  
well the outside box dimensions are going to be 15" W x 16"H x 22" D giving me about 2.32ft^3 after displacement im looking at around 2.12 (including internal bracing.) my plan was to make the port underneath the driver facing the same direction. the port dimensions would be 13.5" W x 1/2"H x whatever depth i would tune it to. probably 38hz. i will be putting an AQ HDC3 12 in it and be giving it the full 1000w rms. i could make the port 1" tall but im worried about losing support on the baffle board. thanks dyohn!
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whiterob 
Copper - Posts: 351
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Joined: July 22, 2007
Location: United States
Posted: October 06, 2009 at 4:23 PM / IP Logged  
That would be too narrow IMO. The general rule I have heard is at least 1" width for every 9". I have also heard 1" every 12" height but you get the idea.
The bigger issue besides the port being narrow is that it is not enough port area. You should have a larger port area for that enclosure. If you do not have enough internal volume with a larger port then I would recommend using an aeroport.
I don't quite understand what you mean by loosing support on the baffle.
aznboi3644 
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Posted: October 06, 2009 at 4:43 PM / IP Logged  
that port is WAYYYY too small.
for that enclosure if your port is 13.5" wide it should be ATLEAST 2.25" TALL.
that current design will FAIL and sound like complete DOG ASS
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armymp90099 
Copper - Posts: 76
Copper spacespace
Joined: July 05, 2009
Location: Illinois, United States
Posted: October 06, 2009 at 5:16 PM / IP Logged  
lol thanks for the input guys aznboi im just gonna pm you with box questions from now on. what would you reccomend? thats as big as i can make the box because im going to get another one down the road and make another identical box. i want to face the driver and port from the trunk into the cab and seal off the trunk so that the only airspace being used by the subs is in the cab. thanks again guys
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aznboi3644 
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Posted: October 06, 2009 at 10:02 PM / IP Logged  
2.2-2.5 cu ft net would be best for the HDC12.
anything smaller and I would suggest getting the 10s. These subs need their airspace and a good amount of port area as they will move some decent air.
You current design has 6.75 sq inches of port area for the one sub...you need atleast 30 sq inches of port area. With that little amount the enclosure will act as a very leaky sealed enclosure and sound like crap.
If you dont have enough space than either downsize the subs or use less subs
Custom Enclosure Design
armymp90099 
Copper - Posts: 76
Copper spacespace
Joined: July 05, 2009
Location: Illinois, United States
Posted: October 06, 2009 at 11:25 PM / IP Logged  
Ok well ill be honest the only reason i was going to make these boxes so small is because the opening for my trunk is kinda small and difficult to get bigger boxes in. I would like to have my system in the 140 db's going down the street. Would that be possible with 1 HDC3 12 in a trunk car even with a properly build and designed box? Thanks a lot for your help guys and sorry if it seems like im being stubborn. lol
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armymp90099 
Copper - Posts: 76
Copper spacespace
Joined: July 05, 2009
Location: Illinois, United States
Posted: October 06, 2009 at 11:50 PM / IP Logged  
UPDATE!!
Ok guys...I'm an idiot...I mis-measured my trunk space and now I have a new setup idea. The boxes would be 18"W x 15"H x 22" L giving my 2.6Ft^3 then the port would be 2.5"W x 13.5"H x 20.93"L giving me the sufficient port area (is that correct Aznboi?) and I can still easily fit both those in my trunk. How is that now? Thanks guys please show mercy when responding. lol
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eric21 
Copper - Posts: 49
Copper spacespace
Joined: May 20, 2009
Posted: October 08, 2009 at 10:02 AM / IP Logged  

armymp90099 wrote:
UPDATE!!
Ok guys...I'm an idiot...I mis-measured my trunk space and now I have a new setup idea. The boxes would be 18"W x 15"H x 22" L giving my 2.6Ft^3 then the port would be 2.5"W x 13.5"H x 20.93"L giving me the sufficient port area (is that correct Aznboi?) and I can still easily fit both those in my trunk. How is that now? Thanks guys please show mercy when responding. lol

Yeah with the port area and speaker area deducted you should have just under 2.1 cu.ft. per box. and tuned to about 37 hertz.

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