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Sub box specs

 

Bronze Member
Username: Rosrock

Post Number: 74
Registered: Mar-09
ok so the adbcwarehouse guy says its tuned to 30 hz and 2.5 cu ft.(this is for an fi q 12) Id like you smart box guys to confirm this please.
here are the OUTER box specs of it.
27 inches wide, 14 inches tall, 16 inches front to back.
the port is 1.5 inches wide(from the inside of it.. all open space) and approximately 12.4 inches tall(again open space.. i didnt count any woodon top of the port or below, if u know what i mean im bad at describing). The port goes 18 inches straight into the box.(theres no L, just an I)
ok so id really appreciate what u guys can come up with thx a lot.
o yea and its 3 quarter mdf wood.
 

Platinum Member
Username: Glasswolf

Lexington, SC USA

Post Number: 13363
Registered: Dec-03
http://www.diysubwoofers.org/prt/ported1.htm
 

Platinum Member
Username: Glasswolf

Lexington, SC USA

Post Number: 13364
Registered: Dec-03
Oh also I would double the front baffle for the sub to 1.5"
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5549
Registered: Oct-05
The box you have looks like it's tuned to 32 hz instead of 30hz (if there is no L in the port like you said) and is about 2.43 cubic feet before displacement. So your looking at around 2.3 cubes @ 32hz for the box you have.
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5550
Registered: Oct-05
I modeled it up with my program
 

Bronze Member
Username: Rosrock

Post Number: 77
Registered: Mar-09
o greatbassman so... is there really that much of a difference ? what should i expect. thx a lot!
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5551
Registered: Oct-05
Nope, there won't be a huge difference and the Q sounds great @ 32hz anyway man. expect some nice lows out of it
 

Bronze Member
Username: Rosrock

Post Number: 78
Registered: Mar-09
jaja thats what im hoping for ordering tomorrow!
 

Bronze Member
Username: Rosrock

Post Number: 79
Registered: Mar-09
o god i cant wait till it arrives heard so many good things
 

Bronze Member
Username: Rosrock

Post Number: 80
Registered: Mar-09
but so bassman if im poweing it with 1200 rms do u think ill need the spider option as well as the p chamfer option? what ya think
 

Gold Member
Username: Southernrebel

Monroe, Louisiana Team Audible...

Post Number: 8024
Registered: Mar-04
If Bassman's #'s are right (didnt check, but i bet they are)...you are looking at less than 9sq inches of port area per cuft.

You might be looking at some pretty nasty port noise at 30-38hz.
 

Bronze Member
Username: Rosrock

Post Number: 81
Registered: Mar-09
someone else confirm what hes saying?(as well as what that means)
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5552
Registered: Oct-05
^^ true, forgot to mention that. You will definently want a little more port area though like Canaan said..
 

Bronze Member
Username: Rosrock

Post Number: 82
Registered: Mar-09
??? so what the hell can i do to change that? ur scaring me man.. suggestions?
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5553
Registered: Oct-05
Means that your port height/width ratio is not big enough so you need a bigger port. If the port was 2.5 - 2.75 inches, that would be alot better.
 

Bronze Member
Username: Rosrock

Post Number: 83
Registered: Mar-09
so lets say i go back to the abc wahehouse guy.. what should i tell him EXACTLY be specific
 

Bronze Member
Username: Rosrock

Post Number: 84
Registered: Mar-09
ur not saying i need a difference box.... are u? or what
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5554
Registered: Oct-05
Tell him that your port area is too small, and that 7 sq inches of port per cube is too little for a slot port. Yes you would need a different enclosure.
 

Gold Member
Username: Southernrebel

Monroe, Louisiana Team Audible...

Post Number: 8025
Registered: Mar-04
Did you tell the box builder what sub you were getting? And what power you would have?

You see, if you were using a low powered sub...say 2-300w, you would be fine w/ that much port area. But w/ higher power, you will likely get chuffing (aka port noise). I would go for at least 12sq per cuft for port area, depending on the amount of power you are using.
 

Gold Member
Username: Dustin3

Box Designer & Builder...Dustin

Post Number: 5557
Registered: Oct-05
Since you will be running 1200 you should look into getting a diff box, or you could try it out, and it if you get no port noise then your fine. But you most likely will.
 

Bronze Member
Username: Rosrock

Post Number: 85
Registered: Mar-09
yes i told him EXACTLY which sub hed be making it for! so since he fucked up dont u think he should make me another free of charge!?
 

Gold Member
Username: Southernrebel

Monroe, Louisiana Team Audible...

Post Number: 8027
Registered: Mar-04
Well, technically yes it is the builder/designers fault for not building it w/ enough port area. But sadly, ALOT of shops don't know any better, and even when they do get port noise, they blame it on the sub not their box. Some don't even know what port noise is.

I would go talk to the guy and ask him if he thinks you will get port noise. If he looks like he has no clue what that is, mount the sub in the box and show him that 'chuffing' sounds like. Then tell him its because of too little port area, get him to rebuild it w/ more port area, but the same tuning.
 

Bronze Member
Username: Rosrock

Post Number: 86
Registered: Mar-09
sigh ok
 

Bronze Member
Username: Rosrock

Post Number: 87
Registered: Mar-09
hey bassman could u give me a call maybe real quick 989-928-0083
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