4 Alpine type R's in a 7.2 Cu-NET box too small?

[guimond47]

hey guys i currently have 3 12" alpine type R's in a 7.2 Cu-NET box and i want to add another. is a 7.2 cu-net box too small for 4 alpine type R's?

and if i want my box tuneed to a lower freq do i make my port longer tword the wall of the inside of the box so air cant get out as easily? if its too small then im thinking of building a new box. okay my old box is tunned to 35.5 hz. it suck on lows like no flex to my mirrors. for example , the song young jeezy - count it up. strickly a 30hz tone around i think and theres no excusion and barly air movement in the vehicule. if i tune to 32 hz would it be better. ? a longer port makes the freq tune lower if im right? because i got plans for a box at 8.4 cu-net for 4 12" and he tunned it to 34 hz and i want a lower freq like 30-32 hz to hit that flexin' spot. ya know. let me know some details thanks.

[Dan2427]

I think you would be ok with 7.2 cubes. What amp do you have and what are you settings?

[mazdaspl]

I personally would go for a new box and tune it right with all 4 12's..

Jay

[guimond47]

okay well i have a box tunned to 34hz how do i make it so its 32 hz? do i make the port 2 inches longer?

[mazdaspl]

Well what measurements do you have to work with? What is this going in? If you could let me see what the design looks like I can help you out..

[lgzmax77]

hey guys i currently have 3 12" alpine type R's in a 7.2 Cu-NET box and i want to add another. is a 7.2 cu-net box too small for 4 alpine type R's?

and if i want my box tuneed to a lower freq do i make my port longer tword the wall of the inside of the box so air cant get out as easily? if its too small then im thinking of building a new box. okay my old box is tunned to 35.5 hz. it suck on lows like no flex to my mirrors. for example , the song young jeezy - count it up. strickly a 30hz tone around i think and theres no excusion and barly air movement in the vehicule. if i tune to 32 hz would it be better. ? a longer port makes the freq tune lower if im right? because i got plans for a box at 8.4 cu-net for 4 12" and he tunned it to 34 hz and i want a lower freq like 30-32 hz to hit that flexin' spot. ya know. let me know some details thanks.

i had 4 15" alpine type rs in a sealed wall. 10.8 cubes and it was split so each pair was seeing 5.4 cubes and it SLAPPED so loud and clean

[98crewcab]

asked tons of people this same question. found the most common answer was 2.3 cubes per sub, 30 square inches of port per sub, and 34hz for tuning. Thats what I built for running 3200watts to them. loved it.

[guimond47]

this is the description of the box he sent me :

In order to make the internal volume correct, I had to shrink it down to 20 inches in height.

Here's what I came up with;

40Wx20Hx28D, 8.4ft^3 net, 117in^2 port area, 21.5 inches effective port length for 34hz tuning

to go with 4 subs at top with port at top

.... If i knew how to upload pics i'd send you a picture..... but u can see it here

http://s1142.photobucket.com/albums/n614/guimond47/?action=view&current=mybox5.jpg#!oZZ1QQcurrentZZhttp%3A%2F%2Fs1142.photobucket.com%2Falbums%2Fn614%2Fguimond47%2F%3Faction%3Dview%26current%3Dmybox5.jpg

copy and paste the link into your internet browser:)

[TeamHT]

asked tons of people this same question. found the most common answer was 2.3 cubes per sub, 30 square inches of port per sub, and 34hz for tuning. Thats what I built for running 3200watts to them. loved it.

Actually, VERY close to what my personal findings and experience show. Although I had better response with a little bit less port area

[mazdaspl]

now with all of your dimensions is that tunning enclude subs and port displacement.. bracing to?