box tuning?

[irpirate]

so i built a box for 4 12" l7s. external dimensions are 38 width x 21.5 height x 31 depth. 3/4 mdf. subs up, port up. port width is 36.5, height is 3.6, length 17.5. its a common chamber for all subs. the only internal bracings i did was a piece of the mdf in the middle top to bottom and a small piece at the bottom of the port.

i have a mac so i cant really find a way to get a program to calculate it for me. ive been getting answers from people and online calculators anywhere from 32 to 38.

go easy on me, first box i ever built

used truckbed liner for the finish.

thanks!

[pstone11]

I'm quick-figuring it to be right around 36... pretty good size for those L7's as well.

[Skullz]

yeah i'm getting 37hz also as the tuning of it.

[irpirate]

one more quick post before i hit the gym. havent had a chance to power them yet, waiting on fugn ups for my amp. first system ive done myself. had a friend threw some stuff in for me the first time while i sat and watched lol. been doing so much research trying to figure everything out. really nervous its not gonna sound good/be loud enough.

suvs are awesome

thank yooooo

[JEDIDIA]

Nice!!! Should sound good!!! How much amp you using?

so i built a box for 4 12" l7s. external dimensions are 38 width x 21.5 height x 31 depth. 3/4 mdf. subs up, port up. port width is 36.5, height is 3.6, length 17.5. its a common chamber for all subs. the only internal bracings i did was a piece of the mdf in the middle top to bottom and a small piece at the bottom of the port.

i have a mac so i cant really find a way to get a program to calculate it for me. ive been getting answers from people and online calculators anywhere from 32 to 38.

go easy on me, first box i ever built

used truckbed liner for the finish.

thanks!

[irpirate]

gonna be using a soundstream dtr 3400 @ .5 ohms. subs are wired parallel/parallel. electric is dc power 270xp, xs power 3100 under the hood and one in back. 3/0 welding for power ground and big 3. have a kicker 850.4 powering 4 phoenix gold rsd 6x9s and 4 pryamid tw18 tweeters. cheap stuff, fuk the mids and highs didnt wanna start ripping my car apart so i just sloppy boxed em and stuck em on the box lol.

front side of box. 850.4 is on a lil ghetto table thing i made, dtr 3400 is gonna sit rite under it. still gotta look at mounting option once i get the amp cuz it can mount vertically. barely have room to fold the seats back up. wouldn't be able to at all if i had the grills on the 6x9s which is why theyre off.

quick question on setting gains w/ a dmm. just wanna check the numbers. i have a 50 hertz 0db sine wave ima play. for the 850.4 each channel needs to push out around 150 rms@ 2 ohms. so i need to match the ac voltage for one channel to 17-18 volts. for the subs i need 3000 rms @ .5 ohms. since the amp has 4 speaker terminals im guessing theyre gonna be connected internally. would it matter which positive or negative channel i put the probes in? the voltage for this should be 39 ya?

thanks everyone