can someone please confirm if this design will work on a zv3 12

[ckeeler11]

i can tell you that on all the configurations you have very high port velocities 115 ft/sec+. Ideally you want to be below 70 ft/sec.

the 3 options i see are:

1) find more space for a bigger box, to allow you to put in a proper port. you can get away with 60 sq/in. at a minimum.

2) different sub.

3) live with what you have.

[akuma4u]

i can tell you that on all the configurations you have very high port velocities 115 ft/sec+. Ideally you want to be below 70 ft/sec.

the 3 options i see are:

1) find more space for a bigger box, to allow you to put in a proper port. you can get away with 60 sq/in. at a minimum.

2) different sub.

3) live with what you have.

thanks for your assistance. Im trying to figure out this port velocity thing.. kinda confusing.

the owner of sundown sent me an email saying that 1.75 net @ 35 hz is best for this sub... max is 2.00 net .. but nothing bigger.. but still 1.75 is better than 2.. i can post his exact email if needed but to summarize he said something about 1.75 allowing more mechanical limits for low end response.

to decrease port velocity, what do i need to do? u say put in a proper port.. how do i do this, what is a proper port and how is mine not a proper port?

thanks

[ckeeler11]

Thats fine you can still make it 1.75 net, with 60 sq. in, of port.

Box could be 13.5h x 33w x 20d with a port 12h x 5w x 50l box will have a net volume of 1.78 cu.ft and 60 sq. in. of port area.

[akuma4u]

Thats fine you can still make it 1.75 net, with 60 sq. in, of port.

Box could be 13.5h x 33w x 20d with a port 12h x 5w x 50l box will have a net volume of 1.78 cu.ft and 60 sq. in. of port area.

impossible

my MAX dimensions are 13.5 height, 32 width and 15 depth.

i thought i had everything figured out until this port velocity bs came up.. now im confused as fuck..

i need 32 sq inch of port as per sundown specs, they recommend 32sq inches of port area for 2 cubes net @ 32hz.. maybe the mistake im making is im thinking its 32 sq inches for the 2 cubes total when its really 32 sq inches PER net cube meaning 64 total?

nah u know what it cant be 64... joe x said im just a hair under the recommended 32 in my original design i had posted in the first few posts in this thread so it is 32 sq in of port .. he would have altered me if i needed 60 sq inches of port or more but he said i was just a hair under...

[ckeeler11]

I'm just going by what WinISD is telling me. Manufacturers are notorious for under-sizing ports to keep box sizes small so people will by bigger more expensive subs. Plus you are overpowering the sub and power factors into port velocity.

red is 36" of port

green is 60" of port

[akuma4u]

I'm just going by what WinISD is telling me. Manufacturers are notorious for under-sizing ports to keep box sizes small so people will by bigger more expensive subs. Plus you are overpowering the sub and power factors into port velocity.

red is 36" of port

green is 60" of port

ill be honest that thought crossed my mind as well that perhaps i was being told incorrect specs in order to please me a bit but leave me wanting more thus upgrading to the next best thing.. but i dunno.. i want to give sundown the benefit of the doubt and hope that they are posting the correct recommendations.. would be pretty whack if thats not the case..the red obv is way peakier than the green.. im going to go ahead and post the question and response i got from jacob when i asked him about box size

[ckeeler11]

I dont have an issue with the box size and i do not see in this emaill where he says anything about port area.

[akuma4u]

I dont have an issue with the box size and i do not see in this emaill where he says anything about port area.

you are right, sorry i forgot to add this,..the two thumbnails are the same design pics in the first couple of posts in this thread

[ckeeler11]

I would never go against an expert on the subs but I imagine you will be leaving quite a bit of output on the table with that box.

[akuma4u]

I would never go against an expert on the subs but I imagine you will be leaving quite a bit of output on the table with that box.

well, due to my trunk size and limitations, the most i can do is increase the port to 3 inches wide maybe 3.25 OR try using aero ports but i have no idea how those work other than they require like half the port area that slotted boxes do .. so that may work out but will be a mission to learn all that stuff... im very new to this and learning every day...