aeroports need the same lenght?

[Xprime4 10+ year member]

now that i'm putting a lot of power on it, it just doesn't sound right at all. Sound pretty bad when i'm putting my ear next to the aeros.

So i'll be removing one, sealing the hole and then cutting the others 3 to 14 inch each. From internet calculator i would be back to my desired tuning.

Is it normal that it really sound like shit now that i'm putting 1500 watt to it unclipped. Sound almost like a mechanical noise coming off the ports

 

[tRiGgEr 5,000+ posts]

I'm laughing inside right now...

Post pics of your box or the design. Also how do you know you're not clipping? did you test it? I'm running a Q and there is no way it can sound bad on it's own. That would take a little effort from you.

 

[Xprime4 10+ year member]

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

I'm laughing inside right now...
Post pics of your box or the design. Also how do you know you're not clipping? did you test it? I'm running a Q and there is no way it can sound bad on it's own. That would take a little effort from you.

well i the amp just got into my car and i tuned it real conservative as far as the gain goes. i'm sure the Q wouldn't like being pushed 2000 watt while not even fully broken in... ain't done the testtone test yet but prolly pushing around 1000 watt atm

the box design is the problem i'm pretty sure. Ain't got pics with me but :

-7.3 before all displacemnt

-4 x 4" aeros that aren't the same size //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif 2 per side on the side of the box (only clearance i had). tuned to 30hz before aeros mod (the sub wouln't fit otherwise... was drunk when constucting it //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif )

so there is like 2 aeros that are 19inch long, 1 that is like 15inch and the other like 17... yeah that's pretty much anything //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

It sound nice till i start to push some power. After that, it sound pretty bad (port noise + mechanical noise + rattle).... //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I got the sub brand new and in free air there was no annoying noise like this. I hear it mostly when i put my ears next to the side with the 19inch and 15inch port. The other aeros, on the other side of the box, makes normal aeros sound.

And by the feel of the air coming out, the shorter aero push a lot more air

that's why i'm guessing my "drunken ***" design sucks:veryhapp:

 

[tRiGgEr 5,000+ posts]

Guarantee you it's your install.

I have a bunch of questions and concerns.

1. What type of electrical system is in your car?

2. Who designed your enclosure

3. If you don't set the amp properly there is no way to tell if you have it setup correctly.

lets start there

 

[Lakota 5,000+ posts]

I've had my port lengths off by a 1/4" before. If you're reasonably close it doesn't matter too much.

 

[Xprime4 10+ year member]

Guarantee you it's your install.
I have a bunch of questions and concerns.

1. What type of electrical system is in your car?

2. Who designed your enclosure

3. If you don't set the amp properly there is no way to tell if you have it setup correctly.

lets start there

1. Pretty poor but i'm monitoring my voltage every second when bumping. Never goes under 13v. Not bumping too long either or when i'm not on the highway.

2. Me, with the help of rashaad for the aeros port dimension. Everything was going well until i had to cut the top part of the box coz my lid wasn't closing... then two aeros got in the way hence the cutting of them...

3. Amp set properly. ss, hpf, gain everything is set by me and i know how amp work. I've set the gain conservatively coz i don't want to blow it.. just got the amp yesturday, did a swap with my low power amp . Now that the sub got some nice excursion, noise are just unbearable... gain set around 1/4 but 1/4 is not a science... but i'm pretty sure i'm not clipping it. That doesn't sound like clipping, more like if the box wasn't sealed right in corner or around port or the port themselves

i'm 99% sure it's a port problem.

 

[tRiGgEr 5,000+ posts]

Do yourself a favor and ask for a enclosure design from one of the knowledgeable members on this site.

 

[Xprime4 10+ year member]

I've had my port lengths off by a 1/4" before. If you're reasonably close it doesn't matter too much.

do you only have one? if so it will only affect tuning. My problem is that almost every of my 4 ports are differents lengh... //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

Pretty marginal //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Xprime4 10+ year member]

Do yourself a favor and ask for a enclosure design from one of the knowledgeable members on this site.

I've been designing it with multiple port calculator then i got it approved by rashaad... when i first build the box it was perfect... modifications i made to it aren't at all.... i was wandering if the different lengh was "****ing" the tuning in the way it sound atm.

 

[tRiGgEr 5,000+ posts]

Well if you want me to check the box give me the specs when you can.

But it does sound like you need to correct your box issues in order to correct the problem.

 

[Xprime4 10+ year member]

Well if you want me to check the box give me the specs when you can.
But it does sound like you need to correct your box issues in order to correct the problem.

i'll make it short just say tell me if my next modification sounds accurate

7.3 ft/ before sub and aeros displacement

.25ft sub displacement.

around .3-.5 ft/cu of aeros displacement ( that will be a clean 3 aeros x 4inch diameter, x 14-15 for 30hz tuning)

that sould leave my around 6.5 net tuned at 30hz with 3 x 4inch aeros of the same exact lengh each.

sound ok? i've checked it with few people and lot of calculator and it seems fine.

If there's still port noise i'll simply seal the Q. There is absolutly no bracing , 3/4 mdf... maybe the box is falling appart at high level

I ain't got a lot of time to play around it with university and my job.. + the **** cold.

btw in my home, before i mod the box it sounded awesome. hitting really really low //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif with only few hundred watts

 

[tRiGgEr 5,000+ posts]

So lets assume the box is actually those dimensions listed.

6.74ft^3 tuned to 29.8hz. With three 4"x14" aeros

And I'll warn you now, that box will require bracing being that size. You are going to hear the enclosure flexing...

 

[Xprime4 10+ year member]

So lets assume the box is actually those dimensions listed.
6.74ft^3 tuned to 29.8hz. With three 4"x14" aeros

And I'll warn you now, that box will require bracing being that size. You are going to hear the enclosure flexing...

It might be that. by the look, the box seems to hold the pressure but it sound like it doesn't... i'll give a look in few minute before going to class

thank's man.

What kind of bracing should I use?

 

[tRiGgEr 5,000+ posts]

It might be that. by the look, the box seems to hold the pressure but it sound like it doesn't... i'll give a look in few minute before going to class
thank's man.

What kind of bracing should I use?

T-rods, Dowels, MDF corner/swiss cheese baffles...

anything really.

 

[Buck 5,000+ posts]

I see my idea for your avatar worked.