do you see any problem with the box design/port position?

[60ndown 10+ year member]

no point in spending time and money building something your not certain will work, 3 might be the problem?, how bout 2 or 4.

i cant tell from your pic where the port is exactly?

and 39hz? why?

you trying to win a comp?

for a daily driver id tune way lower.

 

[adas Pro Seller]

no point in spending time and money building something your not certain will work, 3 might be the problem?, how bout 2 or 4.
i cant tell from your pic where the port is exactly?

and 39hz? why?

you trying to win a comp?

for a daily driver id tune way lower.

1 Its above the right woofer

2. Its a DD, they luv 40 hz tuning, I like 38 gives a bit more lowen but doesnt matter.

3. Why would 4 work when he's struggling with 3.

That box should wrk fine as long as you round off the hump edge and it will sound much better then firing one of thm up. Should be a good setup

 

[Mr Cabinetry 10+ year member]

designing my box for the silverado right now, it will house 3 dd 1508's powered by an IA 20.1. two subs will downfire, 1 will fire up. port is tuned to 39hz, with 48in^2 of port area. box is 3.1 cubic feet after port, sub, and ****** hump displacement. my question is will the location of my port cause any problems? and i have been debating with myself, but will i have to wire the one firing up out of phase with the 2 downfiring? box is 55 x 13.5 x 13 external dimensions using 3/4" MDF. anyone see any problems with this or where i could walk into some?

Well, for one, you don't want the port to fire to the side because given the width of the enclosure the port is going to be choked off firing into the door/side panel.

Next, what size are the subs since no one asked the question????

And since this is a silverado, most likely an extended cab or full 4 door cab, you mostly likely removed the back seat and if ya did that, you got all the room in the world to change the design and function of the enclosure to work for you.

IMO, side firing ports is the worst option since all the energy is being slammed down low rather than firing up or forward, if the room allows for the port to fire forward.

 

[60ndown 10+ year member]

good point, there may be some cancellation issues with subs up and down and port sideways //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[grimreper912003 5,000+ posts]

Well, for one, you don't want the port to fire to the side because given the width of the enclosure the port is going to be choked off firing into the door/side panel.
Next, what size are the subs since no one asked the question????

And since this is a silverado, most likely an extended cab or full 4 door cab, you mostly likely removed the back seat and if ya did that, you got all the room in the world to change the design and function of the enclosure to work for you.

IMO, side firing ports is the worst option since all the energy is being slammed down low rather than firing up or forward, if the room allows for the port to fire forward.

They are DD 1508's...so 8" Subs.

 

[Mr Cabinetry 10+ year member]

Well, that being the case if there 8's, that leaves open a world of design options.

If he can higher in height, increase that to a point where the notch for the ****** tunnel is gone by bring the bottom up to clear it by 3", firing all the subs down and fire the port forward by off setting it to one side of the other.

 

[xhilr8n 10+ year member]

why would a port to the side not work well?.....i have had numerous setups in my truck, same subs different boxes, etc. etc. , my truck has been the loudest with port to one or both sides. That is of course with allowing enough room for the port to at least have a little area off of nearest panel/door etc. just curious

jason

 

[Mr Cabinetry 10+ year member]

That is of course with allowing enough room for the port to at least have a little area off of nearest panel/door etc.
jason

The key words being " allowing enough room ".

having the port opening 2-3 inches away from a wall or whatever imo just doesn't cut it.

I'm not going to argue or debate the point simple because it's more matter of preference given to the function the sub/enclosure designed is to perform.

Since he's giving the port area 48 sq.in. ans since I don't like to assume, I can only speculate for a port that size for the tuning, he's looking for spl and I've built plenty of silverado enclosures and at the width stated, there's maybe 3" - 4" tops that the port would be away from the doors/side panels.

But, hey, if that works for someone and there not concerned, then be happy with it.

 

[xhilr8n 10+ year member]

ok, i was just wondering......my setup is around 14" from the door to the end of the port.

 

[60ndown 10+ year member]

why would a port to the side not work well?.....i have had numerous setups in my truck, same subs different boxes, etc. etc. , my truck has been the loudest with port to one or both sides. That is of course with allowing enough room for the port to at least have a little area off of nearest panel/door etc. just curious
jason

http://www.installer.com/tech/aiming.html

 

[blackbonnie 5,000+ posts]

okay, i am not going for spl. im going for a daily driver. i made adjustments to the ****** hump displacement and considering i forget that i will be raising the box a little to accomadate the down fire the displacement of the hump got reduced and reduced my tuning to around 38hz. i am tuning and going by what alot of other peope run the dd's at. my seat has not been taken out, it is still in there, but has been raised 3". i dont want to run 2 subs, or 4. i have my mind set on this. now i can change my designs, i havent built anything yet but i wanna be set with a design soon, i dont need anyone to design one for me,but to just answer questions and see where i run into problems. i think i will work on one real quick and fire the port forward and see how that runs

 

[blackbonnie 5,000+ posts]

well heres take three, all same dimensions tuning everything, just 3 downfiring and port firing toward windshield

how do you think it will work? its really tough trying to incorporate 3 subs together in a small space and still tune it properly, i had to do some planning but i think i pulled it off. let me know how you think it will work and if it would present any problems.

 

[Mr Cabinetry 10+ year member]

well heres take three, all same dimensions tuning everything, just 3 downfiring and port firing toward windshield

how do you think it will work? its really tough trying to incorporate 3 subs together in a small space and still tune it properly, i had to do some planning but i think i pulled it off. let me know how you think it will work and if it would present any problems.

That design should work out just fine and i know for a fact that you got plenty of clearance for the port. All you have to concern yourself with is the clearance for the subs off the floor.

 

[blackbonnie 5,000+ posts]

yeah, my subs will be here today, and i will figure out there xmax, and go from there. the box will end up being tuned more around 38hz, due to me not factoring in the it will be raised off the floor a bit. but you dont see any problems with the sub being that close to the port?

 

[60ndown 10+ year member]

2 subs in a correctly designed box will be a much better daily driver than 3 subs in a poorly designed box. also 2 subs with lots of power can be way more dynamic, think of the difference between a 250 hp motor in a car that weighs 4000lbs compared to a car that weighs 3000lbs, everything gets quicker.you could run 2 subs and sell the other, i like your new box much better but i am concerned that 1 sub is very close to the port.

1 other thing,

try to build your box so it can be mounted port back AND port forward (by rotating it 180), that way you can try both ways and see which way you like better.