Posted January 15, 201015 yr OK, so I've decided to try out a box using round ports for my 18" nightshade, so i can make the ports interchangeable for comps and daily. I'm using a Hifonics Brutus 1600d amp. i figure the box should be about 5 cubes since the amp isn't that powerful and i want to get a lot of output. i want to use 2 6" diameter pieces of PVC. i am going to do some testing to figure out where my port should be tuned at for spl, but my question is that if i want to keep the box at 5 cubes how big should i make it to make sure its still 5 cubes after the displacement of the ports? i have been looking all night trying to figure this out. i found that if my box is 5 cubes i should use 2 6" x 23.6" to get the tuning to 33 Hz, but would putting the ports in the box change the tuning because it makes the volume smaller? also, i found that the square port area will be 111 cubic inches...is that too much? or too little? or just right? lol idk this round port tuning has me all confused. any help would be greatly appreciated. thanx.
January 15, 201015 yr Yes the displacement of the port will affect tuning. For SPL, meaning one not only, that port area will work well. For daily it is WAY too high, the highest I would go is 80 in2Why are you talking square ports when your asking about round ports, are you going to have both in the same enclosure?
January 15, 201015 yr Author Yes the displacement of the port will affect tuning. For SPL, meaning one not only, that port area will work well. For daily it is WAY too high, the highest I would go is 80 in2Why are you talking square ports when your asking about round ports, are you going to have both in the same enclosure?no sorry about that i meant port area will be 111 cubic inches...and thats my thing it gave me cubic inches not square inches...
January 15, 201015 yr Yes the displacement of the port will affect tuning. For SPL, meaning one not only, that port area will work well. For daily it is WAY too high, the highest I would go is 80 in2Why are you talking square ports when your asking about round ports, are you going to have both in the same enclosure?no sorry about that i meant port area will be 111 cubic inches...and thats my thing it gave me cubic inches not square inches...So that's the port displacement, not port area, right?
January 15, 201015 yr Author no, the calculator asks me for the length and the diameter and then i punch those numbers in and it says total port volume and then it give me 111 inches cubed.
January 15, 201015 yr no, the calculator asks me for the length and the diameter and then i punch those numbers in and it says total port volume and then it give me 111 inches cubed.Port volume is the amount of space in the port, not port area.(LxW) x 6 = Surface area LxWxH = Volume
January 15, 201015 yr Author lol im soo confused...im messing with this other calculator that gives me the displacements and everything all in one..i think my problem might be solved.
January 15, 201015 yr Author OK how does this sound? Box will be 33w x 20h x 20d speaker displacement is .26. I will tune to 33hz and 41 Hz using 6" diameter PVC. Tuning to 33hz will be 5.255 cubes and will use 2 6"s at 22.131 inches long each and the 41hz tuning will be 4.815 cubes and will use 3 6"s at 23.745 inches long each. does this sound alright? Anything i should do differently? Volume is after all displacements. Yes i know the ports will stick out the top of the box a bit, no biggie...BTW I'm doing sub up port up.
January 15, 201015 yr If your amp isn't too powerful, you should increase box size to increase the efficiency of the setup.
January 15, 201015 yr Author well i plan on getting a better alt and some batteries soon and then a bigger amp...other than wattage and size does it look correct?
January 15, 201015 yr when you have small amp you want a larger box.. and the other way around for a large amp
January 15, 201015 yr Author yea i plan on running a 1500d or a 2000d to it soon hopefully. u think the box would work good with one of those amps?
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.