Port Clearance?? Please Help Me!!!!

[profoundwill 10+ year member]

I am building a box for one 10 and the sub will be firing down towards the floor. I also plan on porting the box with the port firing down towards the floor also. The port is going to be a 5 inch circle port. I plan on putting about 1-2 inches of space under the box so the sub won't hit the floor when it is on. My question is, will that be enough space under the box to allow the port to perform right?

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[tRiGgEr 5,000+ posts]

Well it's not going to perform right pointed at the floor. Well it will just not optimal performance. I would leave half of the diameter at least for clearance.

 

[profoundwill 10+ year member]

If not pointed towards the floor then where? I thought you wanted to have the port firing the same direction as the sub?

 

[hoss 5,000+ posts]

i wouldnt forsee a huge problem firing at the floor, as long as you have clearance down there. another suggestion would be to have the sub firing towards the floor, with the port facing upwards. i have seen several HT set ups like this that worked very well. but as mentioned, you have to have clearance between the sub and the floor, i dont think you will need half the diameter of the woofer, i would say 4-6 incheswould do.

 

[tRiGgEr 5,000+ posts]

If he is down firing the sub I'm sure there is a reason. Under a seat probably. If you can't point them towards the front of your truck then down will be fine just leave 2" minimum for the port to "vent".

 

[profoundwill 10+ year member]

Yes the sub is going under the back seat. So with about 2 inches of clearance I should okay, right? The port sould able to vent, but would this amount of space also prevent "noise"?

 

[hoss 5,000+ posts]

if they are going under the seats, another suggestion mught be to face the woofers up(assuming you trust the seat frame not to get too close to the woofers), and face the ports towards the front of the car, kinda CRX style

 

[hoss 5,000+ posts]

Yes the sub is going under the back seat. So with about 2 inches of clearance I should okay, right? The port sould able to vent, but would this amount of space also prevent "noise"?

2 inches of clearance is probably gonna give you some pressure issues. might be better off sealing them in that kinda space.

but you wont know till you try it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[profoundwill 10+ year member]

Can't go sealed I need SPL! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I like your idea about having them firing up and the port firing towards the front that sounds pretty good. However I had some subs in like that before, but they were not ported. anyway they were fine unless someone sat on the back seat then they wouldn't play because the cone couldn't move. So having a sub firing up like that is not bad on the woofer?

 

[hoss 5,000+ posts]

Can't go sealed I need SPL! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

might consider a different set up then...

if under the seat is the only way you can get them in, i would suggest 2 RE8's instead of your single 10". they will most likely work better in the smaller airspace, give you more room for your port(s), and most likely get louder.

otherwise, i would suggest finding a different place for your 10". perhaps a rear seat center console.

 

[jellyfish420 10+ year member]

i think i would try angleing the face...like 2" to the floor in the back and 3or4 in the front. that would help get rid of some of the cancellation...

 

[profoundwill 10+ year member]

Well what should I do then, Jmac?

 

[profoundwill 10+ year member]

I would like to do a slot port but my box is going to be wedge shape how would I calculate the port area and would it work correctly if the port is slanted? What about if I fire the sub and port up? Will that hurt the sub firing it up?

 

[profoundwill 10+ year member]

Thanks guys for your help, I will be trying out several of these ideas and I will let you know which one works the best. Thanks again!!

 

[mrray13 10+ year member]

profound..

face the sub down.port aimed backwards...

just like inside the box..u need the the port width minimum for port "clearance"...ie: if u are using a 3" round port..the port needs to be 3" away from anything on the OUTSIDE of the box as well...

also, by going one ten, i assume ur just using half ur backseat area......sub facing down, port facing the middle of the truck....i just sold my 10" box identical to that...i'll post some pics to help...

as u walked up to the truck

up close

the recessed sub

the port on the side...

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif

 

[mrray13 10+ year member]

and..if u want....

i've also got a dual ten ported box for sale.....$400 shipped with memphis hpo's or make me an offer empty....grey carpet...

walking up on the truck

the recessed subs

the rear firing round ports..individual chambers

with carpet...

carpet x2

x3

x4

hope that helps...lemme know if ur interested

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eace

 

[profoundwill 10+ year member]

Thanks for the offer, but I am going to try to build my own. Also, thanks for the advice.

 

[profoundwill 10+ year member]

Mrray that is nice box it looks like it is a rectangle box and not a wedged box. am I correct. What is the hieght of the box in front and back also how much airspace is it inside of the box? Did you raise your back seat? Thanks>

 

[mrray13 10+ year member]

Mrray that is nice box it looks like it is a rectangle box and not a wedged box. am I correct. What is the hieght of the box in front and back also how much airspace is it inside of the box? Did you raise your back seat? Thanks>

it's a slight wedge shape..

with feet..it's like 9.5" in front..8.5" in back...

each chamber is about .8-.9ft^3 after port and sub displacement.

back seat is in original postion.. no need to change it any.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif