Welcome to the IHoP

[Penguin4x4 1,761]

You Glorious Bastard

[Penguin4x4 1,761]

[Penguin4x4 1,761]

[Penguin4x4 1,761]

http://www.youtube.com/watch?v=ng6nw9dAsE0

[Luke.H 33]

Anyone get the new Red Hot Chili Peppers album? I was pretty psyched about it for what ever reason, finally got it and only a few songs really stand out.....

I've got it. I came to the same conclusion.

[The enD 467]

Anyone know how much does a Sundown Zv1 18 inch weight?

[Luke.H 33]

Such a nice day. Took a drive with some friends, but wish I could have gone out on our boat.

[Luke.H 33]

XK8 isn't a bad alternative

[ssh 924]

So I'm making a calculator for minimum port area, aero port(s) length, and slot port length.

I've found tons of slot port length calcs and even aero port length calc, but not for multiple aero ports, or for minimum port area...

Hopefully it'll help people out.

[Ohjay 116]

Anyone know how much does a Sundown Zv1 18 inch weight?

I just mailed a Zv1 15 and it was 40 lbs. or 18.1kg.

[ssh 924]

Finished calculator, time to make it somewhat perrddy!

[ssh 924]

Done... http://portsgalore.stefanhinote.com/

I'll see what the IHOP has to say, then make a new thread.

[NB50 206]

Done... http://portsgalore.stefanhinote.com/

I'll see what the IHOP has to say, then make a new thread.

How did you calculate for the multiple aero ports?

[ssh 924]

Done... http://portsgalore.stefanhinote.com/

I'll see what the IHOP has to say, then make a new thread.

How did you calculate for the multiple aero ports?

It all comes down to port area. If you input more then one aeroport, the area of each port is added together, then port length is found for that total port area.

Example:

10" circle = 78.54in^2 area.

2 10" circles = 157.08in^2 area.

Then break 157.08 back down to a diameter for formula usage.

157/pi = 50

sqrt(50) = 7.07

7.07(2)= 14.14" diameter. Then use 14.14" diameter for formula.

Same as:

1"x78.54" slot port, or

2"x157.04" slot port.

[ssh 924]

The only thing not taken into consideration is the flaring on some aero ports.

[NB50 206]

Done... http://portsgalore.stefanhinote.com/

I'll see what the IHOP has to say, then make a new thread.

How did you calculate for the multiple aero ports?

It all comes down to port area. If you input more then one aeroport, the area of each port is added together, then port length is found for that total port area.

Example:

10" circle = 78.54in^2 area.

2 10" circles = 157.08in^2 area.

Same as:

1"x78.54" slot port, or

2"x157.04" slot port.

That's wrong. You need to divide the box volume by number of ports and use that number and the area of one port. Also not accounting for flares, I wouldn't call it an aero port calculator then.

[ssh 924]

Done... http://portsgalore.stefanhinote.com/

I'll see what the IHOP has to say, then make a new thread.

How did you calculate for the multiple aero ports?

It all comes down to port area. If you input more then one aeroport, the area of each port is added together, then port length is found for that total port area.

Example:

10" circle = 78.54in^2 area.

2 10" circles = 157.08in^2 area.

Same as:

1"x78.54" slot port, or

2"x157.04" slot port.

That's wrong. You need to divide the box volume by number of ports and use that number and the area of one port. Also not accounting for flares, I wouldn't call it an aero port calculator then.

I believe that's just another way of doing it.

And I'll look into adding flares and how it effects everything.

[ssh 924]

Bromo, do me a favor since I'm doing it wrong.

Find the port length required for a slot port, 1"x157" for 30hz tuning, 10ft^3.

Now find the port length required for a 14.142" aero port for 30hz tuning, 10ft^3.

Would you agree that both ports have the same port area and same port length, therefore they should act the same (aside that the aeroport may have less turbulence,etc)?

Now find the area of 10" diameter circle. Now multiply that area by 2 (for two aeroports), now is the final area the same as the above slot ports & 14.142" aero port?

Is this any different then dividing enclosure volume by number of ports and finding the length for one? If so, I'll gladly change it.

I didn't see any formula for multiple ports in the loudspeaker cookbook, so I simply transferred the combined area of all ports and made it into a single larger one.

It looks like the psp site adds one inch to the straight length for the flared length.

Now I'm just confused, If I use the calc on psp, if I halve the volume and go from 2 ports to 1 port then the port length stays the same. This does make sense.

Now If use the same tuning, volume, port diameter, and one port using the formula from the loud speaker cookbook, it's exactly the same as psp.

Now if I change from one port to two ports or multiple, the port lengths drop a few inches.

Yet I have the SAME EXACT port area as a slot port (1"x157", 157in^2) and I come up with the SAME EXACT port length.

Well it sounded very logical, but your correct Bromo, according to JL:

Notice that Method 1 produces the same port length as did our single 4" diamter port as it should (after all, we have the same total port cross-sectional area which this school of thought proclaims is correct!). But the first method is incorrect because it neglects the frictional losses encountered by using many smaller ports--there is a higher port wall surface area to cross-sectional area ratio which raises the total amount of frictional losses in the ports and thus shifts the tuning!

I didn't take "frictional losses" into consideration.

[ssh 924]

Update,

Changed the multiple aero port to the way you suggested Bromo, works the same as the psp calc. Added an option for flared ports or not flared.

So now I believe it's correct.

Going to do some revision to the suggested aero ports on "find minimum port area". Only going to suggest what you can buy from PE, madisound, etc.

Done.

[NB50 206]

[Penguin4x4 1,761]

Hey look the heat index finally got down below triple digits....at 9PM...only 99F now!

[ssh 924]

Hey look the heat index finally got down below triple digits....at 9PM...only 99F now!

LOL.

[///M5 2,833]

Football. Dynasty league.

Gotcha. I'm from Cincinnati so football is hard to watch, lol

Buffalo............Enough said?

J

CJ Spiller has to grow some balls and fucking get it done this year.

Not so sure that losing 4 Superbowls puts being a Vikes fan in the highest regard either.

[///M5 2,833]

Went out last night for my once a week cheat meal, to watch the Ravens game. I was chilling solo for the first quarter with some great old bay wings, then I bump into a college team mate. $100 bar tab and 3 hours of sleep later, I am feeling a little scruffy this morning.

Awesome, love those nights. I'm scruffy still from Friday night. Fantasy free agent auction in the league I've been in since the late 80's. Great to get together with everyone.

[Julian 641]

Hey look the heat index finally got down below triple digits....at 9PM...only 99F now!

LOL.

just hit 95 not too long ago.