Box Design Help for 18" FI Q w/BP, 4" Aero Ports...

[snb778 5,000+ posts]

Whats up guys...

I want to build a new box for my Q. I think it will give me just the little more output that I'm looking for.

My max dimensions give me 6.7Cu. Ft. before port and sub Disp.

I have 4x 4"wide by 10" length Flared Aero Ports

I would like to tune it to 30Hz. I don't know how to figure out how long to make the ports, or how many I would need to use.. I would like to go for 3 if possible.... Pretty sure I don't have room to do a slot port. can someone help me out, or give some recommendations.?? Thanks

oh, the box would be 34x24x14.25 as of now

Fs: 24.5 Hz | 23.8 Hz

Re: 0.7 Ohms/coil | 1.4 Ohms/coil

Qms: 5.66 | 5.73

Qes: .64 | .63

Qts: .58 | .57

Mms: 322g | 342g

Cms: 0.13mm/N | 0.13mm/N

Sd: 1210cm^2 | 1210cm^2

Vas: 268 l | 268 l

Spl: 89.7dB 1W/1m | 89.4dB 1W/1m

Bl: 10.4 N/A | 15.1 N/A

Xmax: 27mm

Rms: 1000W

Sealed box: 4-8 cuft

Ported box: 6-10 cuft @ 28Hz

Sub OD: 18.500”

Cut ID: 16.750”

Mounting depth: 10.000”

Displacement: 0.24cuft

Click to read more...

 

[mlstrass 5,000+ posts]

precision ports has a calculator on their site...

 

[mlstrass 5,000+ posts]

http://www.psp-inc.com/

 

[snb778 5,000+ posts]

yea but that doesnt telll me how much port area is required by my sub... That site showed I could use 2 ports...when that isn't enough for my sub.

well after just toyin around with that site... looks like I would need 3 or 4 longer ports than what I have.... or I need 2 6" aero's :-( Will PVC work ALMOST just as well?

 

[snb778 5,000+ posts]

bump..... need help

 

[snb778 5,000+ posts]

bump... someone please help!!

 

[bass-aholic 10+ year member]

IMO use 3 4" ports and pvc will work just as good if you dont care about how it looks(your not gonna see it anyways).

 

[snb778 5,000+ posts]

why is it that some people say don't use PVC?? Can someone please help!!

I am going to just use 3x 4" ports... I want to tune it to 30Hz. How long would they need to be.. Yes, they are flared. Thx!! 6.7 cu. ft. before Disp. and port, so please take that into account when calculating

 

[snb778 5,000+ posts]

ttt.............................. .............................. ...........................

 

[mlstrass 5,000+ posts]

there's plenty of online calculators to help you out...

 

[snb778 5,000+ posts]

correct, but they don't tell me how much port my sub wants to see on it's box,and that is where I need help.

 

[snb778 5,000+ posts]

ttt

 

[maniackilla 10+ year member]

yes they do, read them. your just asking other to go plug the numbers in for you. links have been provided are sticky's are placed in discussions for a reasons. There is no sense for you to agree or disagree with some one and turn around and say "I'll just do this then, thats all I can do, It'll be good enough .... right?!?!?" .... your leading the thread into recursion, learn those things first *again, stickies*

If you dont give a shit on this apparent setup, you shouldn't have bought it. Let me take it off your hands. I've a a 7.3 cube box at 32 hz that'll fit right in my TRUNK with nothing but a 30x35" baffle replacement.

/end rant

just read up on the information provided man, or lemme know if you wanna sell it

 

[snb778 5,000+ posts]

yes they do, read them. your just asking other to go plug the numbers in for you. links have been provided are sticky's are placed in discussions for a reasons. There is no sense for you to agree or disagree with some one and turn around and say "I'll just do this then, thats all I can do, It'll be good enough .... right?!?!?" .... your leading the thread into recursion, learn those things first *again, stickies*
If you dont give a shit on this apparent setup, you shouldn't have bought it. Let me take it off your hands. I've a a 7.3 cube box at 32 hz that'll fit right in my TRUNK with nothing but a 30x35" baffle replacement.

/end rant

just read up on the information provided man, or lemme know if you wanna sell it

FYI.... the link provided for me DOES NOT give me what I need!! its a totally general equation.. as I said.. it doesnt account for how much port each specific sub needs... The link provided says I can use 2x 4" aero's for an 18" sub, that needs much more than 2... so no, not / end rant.

 

[Buck 5,000+ posts]

i would go bigger than 6.7 cub ft. maybe you should look at a 15 instead if you can