Box help for 2 Dc 12's

[on1wheel01 10+ year member]

Well I am probably gonna pick up 2 DC sound level 3 12's. Just wondering what would be a good tuning for these daily. They recommend 28 but I figure thats to low. My box is gonna be 33 wide 16.5 tall and 18 deep. Which is 3.5 cubes, my ? is should I make the port 3" wide and tuned 31.1, 3.5" wide and tuned to 33.8, 4" and have it tuned to 36.4, or last 4.5 and tuned to 39(which i think would be to high). This would be for daily use, just wanting to slam really hard. My thoughts are 3.5" at 33.8, just wanted others thoughts.......... Sorry for another tuning thread

Click to read more...

 

[DonH 5,000+ posts]

i take it your thinking 3" wide by 15" tall.... not enough for thoze subs! 4.5x15 would get my vote due to more port area also why you thinking you can only get 39hz?? tune it lower!!

 

[on1wheel01 10+ year member]

Well i am using the re calc and with 33 16.5 18 18 and 4.5 as port width it says its 39. Not sure what I could do to tune it lower any ideas?

 

[DonH 5,000+ posts]

well change the port piece number 2 //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

put it to 18 inches and you get 36.6 hz by their calculation and 3 cubes

 

[on1wheel01 10+ year member]

now another prob it says with 4.5 port to make the front plate 27.75 wide thats gonna be cutting it close with the speaker cut outs

 

[on1wheel01 10+ year member]

ahh gotcha what affect in sound would that have i always just cut it to 8". That would bring it right at what they call for 1.5 each

 

[DonH 5,000+ posts]

now another prob it says with 4.5 port to make the front plate 27.75 wide thats gonna be cutting it close with the speaker cut outs

yes it will man you might want to double baffle that puppy.

also diff. peak level. cant tell you what cuz im at school //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[on1wheel01 10+ year member]

yea i figured i'd double baffle it, I was gonna flush it but dont wanna have 3 pieces of mdf on there. what do you mean by peak level?

 

[on1wheel01 10+ year member]

ok well figured it out. I'm going with a 4"x 15" wide port. That will make the from plate 28.25" x 15". From cut out to cut out I'll have 2.75". A little under 1.75" between subs after subs mounted. I will have .50" from sub mounting screws to the end of the side wall,add .75 for the wood thickness, and get 1.25. Hopefully this will be strong enough. I guess I will double baffle it.

 

[kyle7 10+ year member]

dunno if this site is very credibal but it will help you figure out how much port area you need to make sure you dont get port noise. with 2 level 3's tuned to around 35 you will need approx 258 sq inches of Port area. again dunno how accurate this site is. hope this helps

http://www.carstereo.com/help/Articles.cfm?id=31

 

[kyle7 10+ year member]

seems a bit excessive to me lol

 

[kyle7 10+ year member]

forget the 258 i put in the wrong numbers lol. mor like 85.

 

[on1wheel01 10+ year member]

yea i go on 16" of port for every cube. so thats 64, ill be at 60 not to far off

 

[on1wheel01 10+ year member]

bumf

 

[on1wheel01 10+ year member]

bumf