OK. Im building a box for my S-10 blazer and i need help with the port. The box is 38" wide 19" high and 14.5" Deep. It hold 4 RE SR 10 D4's. Id like the port to be now wider than 10" no taller than 6". id like it to be alot wider than taller just to kinda "fit" better... Thanks in advance

-Mike

For your subs you will need a certain port area. Find that and you can use almost any width / height combinations, with some common sense.

how do i calculate port area?

H(in) x W(in) of the port will give you your port area in square inches

ok. but how do i know how much the subs need for port area? can somebidy help me find it?

Guessing your measurements are external, I get 6cubes gross to start. Are you using 3/4 material? And any double baffles anywhere, or bracing?

i have a 2x4 in the middle for bracing. 3/4 MDF is right. The subs want 1 cube a piece. so are you saying i only need 6 inches of port area? my buddy made one that looks way to small 7 LONG 1 HIGH 3 DEEP so 7x1x3 is that right looks tiny.

NO, take your measurements again by subtracting 1.5'' from each angle. Dont know what port area will be till you know what net volume you have.

try putting your dimetinos into the re box calc and mess with the port ares untill you get the hertz you want

YEA me and LilTeddyP are building the box so were gonna change the port tommrow..

Huh?

I'd use half the surface of the subs for port area. So for 2 10's, use as much port area as the cone area of 1 10.

IMO it doesn't matter if the sub is in 0.5cf or in 20cf, it's still going to have the same excursion potential (diffrent power levels for the 2 examples) so it will need the same cone area to prevent port noise.

Huh?

It was suggested to use the box calc. until i get the right Hz.

I'd use half the surface of the subs for port area. So for 2 10's, use as much port area as the cone area of 1 10.

IMO it doesn't matter if the sub is in 0.5cf or in 20cf, it's still going to have the same excursion potential (diffrent power levels for the 2 examples) so it will need the same cone area to prevent port noise.

ok i guess well try that. thanks

Huh?

It was suggested to use the box calc. until i get the right Hz.

I thought you were giving up for a second. So you and your boy are going to build this from a box calc then?

ok i called RE TECH today and he said 12.5 square inches PER cubic foot of internal space. well my box need 4 cubic feet so i need 50 square inches of port? he said the port has to be 20 inches long. THATS A BIG PORT FOR FOUR 10's. does that sound right?...

RE tech support said 12.5 square inches per cubic foot of internal volume. 20 inches long. That seems like a lot for tens. sound right?

its a good size its only 5x10 the length though depends on what you tune to.

ok well i want to be tuned to 32Hz so how long would that be? Im sorry im such a noob... i just dont get all this yet...

RE tech support said 12.5 square inches per cubic foot of internal volume. 20 inches long. That seems like a lot for tens. sound right?

That will work.

so being 20 inches long, will make me have to port out the side... is that gonna cause any problems?

Edited November 7, 200816 yr by bngblzr

Your port doesn't have to be 20 inches straight, it could be 10 deep and 10 to the side. An 'L' shaped port.

so being 20 inches long, will make me have to port out the side... is that gonna cause any problems?

I was wondering why the port in your sig pic is so small. What is the H x W measurement on it anyway? Now I understand, after the comment about how big the port was for 4 10s.

the port for the 4 12's did look small but thats what the shop biult it to be. SOUNDED amazing. til some dickhead stole it....