Downfiring enclosure: To the wire

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uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: February 23, 2005 at 8:26 PM / IP Logged

Well, i finally got those blasted T/S measurements for my two Nakamichi SP-W120 subs. I checked out WinISD and i got some measurements. (LengthxDepthxHeight) 25.90" x 10.65" x 16.75". That 16.75" is the maximum i can go for the enclosure to fit under my roll over cover, so i will have to make the sides bigger and decrease the volume a bit. Any clues? WinISD suggested i also port them. A 4.02" circular port to be exact. I hate circular ports. I want to know how i can do this with a slot port instead and still have those suckers tuned down to 35 hertz. The box is 1.97 cubic feet. Here are those parameters: (Its a 12'' Woofer)

Fs = 28.15 Hz

Vas = 85.30 L

Qms = 4.08

Qes = .36

Qts = .33

Xmax = 6.00 mm

Re = 3.39 ohms

Specs

Sensitivity = 90 db

Power Handling = 200 watts RMS / 400 watts peak

Freq Response = 25 - 250 Hz

4ohm Impedance

Mounting Depth = 5"

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: February 23, 2005 at 8:54 PM / IP Logged

bump

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: February 23, 2005 at 8:59 PM / IP Logged

Check out the kingpin111 thread that says You guys have come highly recommended.......the way to change from round port to slot is in there.

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: February 23, 2005 at 9:17 PM / IP Logged

I checked that out but i'm still confused. My other questions haven't been answered, but what formula do i use to get lxwxh of the port? I like the whole square port thing that is far better for what i want. How deep should the port go if i know i can only go 10.65" total in depth and the circular port was 4.02" ???

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

forbidden

Platinum - Posts: 5,352

Joined: November 01, 2003

Location: Alberta, Canada

Posted: February 23, 2005 at 9:38 PM / IP Logged

Find the port length for the circular port, this length stays the same for a slot port. Next you need to find the area of a circle and rectangle.

circle = pie * r^2 or in this case a 4" port is 3.1415 * 2^2 = 12.57 square inches.

rectangle = l * w = 12.57 eg. or a slot port of 6.26" * 2" * whatever the depth of the circle port was.

Top Secret, I can tell you but then my wife will kill me.

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: February 23, 2005 at 9:41 PM / IP Logged

It says the vent length is 10.95 inches, impossible when the depth is 10.65"... unless i'm missing something.

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

kfr01

Gold - Posts: 2,121

Joined: April 30, 2003

Posted: February 23, 2005 at 10:04 PM / IP Logged

Is it really that big of a mystery? Bend it around the corner.

New Project: 2003 Pathfinder

forbidden

Platinum - Posts: 5,352

Joined: November 01, 2003

Location: Alberta, Canada

Posted: February 23, 2005 at 10:24 PM / IP Logged

And use the flexible 1/2" mdf to do this with.

Top Secret, I can tell you but then my wife will kill me.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: February 23, 2005 at 10:31 PM / IP Logged

Uthink, you should really just spend a little more time understanding how that program works. If you notice, 4.02 comes up as default with every new project that is vented. You can change it. Double click on it, type in the diameter that will give you a shorter length that will fit in your box. Convert to slot ala Rob's post.

uthinkuknoaudio

Silver - Posts: 760

Joined: October 08, 2004

Location: United States

Posted: February 24, 2005 at 4:21 PM / IP Logged

What does it mean when the vent mach number is in the red? Do i have to change it until it hits the green? To 0.0 perhaps?

"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

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