quick box design and tuning question

[jmkanek 10+ year member]

i have a box designed here that is 30" wide, 32" deep, and 14" tall, with a 9" wide port, 3.6 cu.ft after port displacment, and 41.5 htz tuning, my question is when i drop my two orions in will it raise the tuning any, and if so to about what, and would that box be suitable for two 12" orion hcca 12.2s for spl

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[jmkanek 10+ year member]

oh yea and 105 sq in. of port area, if ya need to know a bout the port area

 

[psych0ticnemes1 5,000+ posts]

That is a lot of port area for two 12"s. You should have calculated net volume after including subwoofer displacement. Your overall net volume will be lower after you drop the subs in, causing your tuning to be slightly higher than expected.

 

[jmkanek 10+ year member]

alright thats what i thought, it would go up, im new to the box building and tuning, so what would be a good design for two orion hcca's, 30 is the max width i can go and 15 is the max heigth i can go, and i can go up to 36 in deep, im looking to tune to around 42hz or somewhere in that area,

 

[jmkanek 10+ year member]

been playing around with the reaudio port calculator, and heres what i come up with, i think ima build a box thas 30" wide 30" deep and 15" high with a double baffle top, ports is going to be on the front bottom of box at 3.5" tall and 28.5" wide, which gives me a tuning of around 40hz, and port area of 99, what you guys think of this design should it be ok for the two orions

 

[jmkanek 10+ year member]

or should i go with a 3" tall port, which would tune it to around 36hz, and have 85.5^2in of port

 

[Pioneer~Saturn 5,000+ posts]

^That sounds more along the lines of what I'd go for...what would the airspace be with those last port specs?

 

[jmkanek 10+ year member]

4.4^3ft. at 36 hz tuning, and 4.15^3ft. at 40 hz tuning ofcouse thas all before i put in the subs, which i think they are .25^ft. displacement each

 

[Pioneer~Saturn 5,000+ posts]

I could see the 4.4 cubes @ 36Hz with 85 sq inches of port doing quite well for output and shouldnt sound half bad either (ofcourse it'll really come down to your vehicle and some other factors etc etc)

 

[jmkanek 10+ year member]

i was gonnna put my stuff in my blazer but due, to some issues with it not wanting to run right, im in restricted space in my 95 integra which is what im building this box for, ya think i should run subs up port back or port out the front, or what do ya reccomend

 

[Pioneer~Saturn 5,000+ posts]

If space is tight you may have to run subs up, port back...but I'd leave room behind the enclosure if the port's back or you'll choke off the port

 

[jmkanek 10+ year member]

yea ima take out my back seats and have the enclosure id say about 12 inches away from the back of the hatch, and i have a good layer of dynamat extreme on the back and top of the hatch, but ya think the 36hz at 85 square inches of port would be better the the 40 hz tuning

 

[Pioneer~Saturn 5,000+ posts]

Well, depends what youre going for...if this is for music/daily...36Hz for sure but if youre looking to get a little louder on the mic 40Hz...but music would lack, in my taste atleast

 

[jmkanek 10+ year member]

yea i wanna get loud on the mic, but i dont wanna sacrafice too much of the musical value either so id say the 36 hz, should be a good balance i think

 

[Pioneer~Saturn 5,000+ posts]

Yea, 36Hz then for sure.