Questionable install from local store

[montx 10+ year member]

Because I absolutely **** at building boxes, I went to my local place for them to build a ported box to hold my two Interfire IFB-15D's. They're 600RMS each and call for 2 cubic feet for each sub and if you go ported, the sheet says a 2" W and 8"H port for a SINGLE sub. The box they made has 4 cubic feet but only that 2" W and 8" H port. Why such a small port? When you have a spec for a single sub, wouldn't you double that when you have two subs? The results of the sub are excellent response in higher lows, but sloppy ( SLOPPY ) performance on lows.

I know it has to be the box because my girl friend has a similar enclosure for her two audiobahns ( I tried to pursuade her away ) but surprisingly they're louder!

Could the one small port be limiting the subs in my car? I'm just upset that such shitty speakers as the audiobahns could be hitting louder than my car. And she bought her audijunks for new online for 90 bucks for the pair :

Click to read more...

 

[chinxtaboi 10+ year member]

im not sure what interfire is, but maybe it isnt better than audiobahn. how long is the port?

 

[THUMPPER 10+ year member]

I see his all the time....a 2 x 8 port is not sufficient for two 12"

by any means...can you say PORT NOISE!!!!

how much $$$ did they charge you????

 

[ThatChevyGuy 5,000+ posts]

Yeah hes got two fifteens. Not near enough port. Shouldve had a member build it.

 

[dman4486 5,000+ posts]

2x8 is 16sq inches of port....with 2 you need 32 sq inches of port

 

[Immacomputer 10+ year member]

Your problem is 100% your enclosure.

First off, that's not enough port area for one of those subs, let alone, two. Also, 4 cubes shared is very small for two of those subs. I suggest either using 1 of them in an enclosure about the same size or double the size and add a ton more port area.

If you want, I could design something for you and you can have somebody build it.

I would definitely take it back to the shop and let them know you're not satisfied with their work and see what they will do to make it up for you. I bet they charged you an *** load for it too. :\

 

[dman4486 5,000+ posts]

http://www.streetsoundsonline.com/Interfire-Subwoofers/c38_47/p214/Interfire-IFB-15D-Subwoofer/product_info.html

if the specs are correct, you will want 7 cubes for 2 of them

 

[canadapettit 10+ year member]

Interfire makes budget friendly subs and amps, for what it is though its pretty good. I had 2 of the 10" version of the subs he has on an interfire amp and it hits pretty good.

 

[chinxtaboi 10+ year member]

ohhh.. i thought the original post said 2x18.. yea 2x8 is a tiny port. tiny port FTL.

 

[skadude016 5,000+ posts]

http://www.streetsoundsonline.com/Interfire-Subwoofers/c38_47/p214/Interfire-IFB-15D-Subwoofer/product_info.html
if the specs are correct, you will want 7 cubes for 2 of them

7 cubes sounds dead on. 4 cubes would be suffocating those woofers which is why your getting such peaky high bass out of it. a 7 cube box needs atleast 80-85 sq inches of port in the least! and if you are wanting a more down low bass tuning in the low 30's will give that to you.

 

[montx 10+ year member]

Yeah I knew it was the port size because they hit mids incredibly, incredibly loud but when it hits lows it sounds like its clipping because it cant move the air. I PM'D Immacomputer but as I told him, if anyone could design a box I'd definately appreciate here. Here are the specs:

http://www.streetsoundsonline.com/images/subsIFBtable15.GIF

As I also told him, I'd like the subs to fire towards the rear and the port towards the cabin. But I'm not sure which is best for hatchback, since my car is an acura integra ( 1991 RS ). Any help would be appreciated! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[skadude016 5,000+ posts]

Yeah I knew it was the port size because they hit mids incredibly, incredibly loud but when it hits lows it sounds like its clipping because it cant move the air. I PM'D Immacomputer but as I told him, if anyone could design a box I'd definately appreciate here. Here are the specs:http://www.streetsoundsonline.com/images/subsIFBtable15.GIF

As I also told him, I'd like the subs to fire towards the rear and the port towards the cabin. But I'm not sure which is best for hatchback, since my car is an acura integra ( 1991 RS ). Any help would be appreciated! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

may wanna do just a single 15 in a big ported box that will get down low

 

[montx 10+ year member]

I already have the two subs so //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I don't need earth shattering because obviously I wont get that with these subs... But I need something that will hit lows BETTER. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif My box will have to be designed in a manor where the box will only be wide enough to hold the subs and an inch on each side... but a really long box.... Do you know what I'm getting at? Look at my current box :

See how I'm going to have to have the box sitting in my back seat as well as in the trunk? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I'll post the maximum height and width tonight. BTW I paid 200 locally for this box :

 

[skadude016 5,000+ posts]

just do subs firing up. and port firing back. with a port along the bottom of the box //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[NoobieAudio 10+ year member]

just do subs firing up. and port firing back. with a port along the bottom of the box //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

x2 best option