need box design for alpine type r 15

Home / the12volt's Install Bay / Car Audio / need box design for alpine type r 15 (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

bumflik

Copper - Posts: 58

Joined: January 03, 2008

Location: Florida, United States

Posted: March 03, 2009 at 11:36 AM / IP Logged

I need somebody to help me design a really loud and efficient box for a Alpine Type R tuned to 34 hz. The maximum height is 15" Max width is 40" max depth is 23"

airhed692005

Copper - Posts: 72

Joined: January 04, 2009

Location: Michigan, United States

Posted: March 03, 2009 at 4:31 PM / IP Logged

doing it fiber glass or just a box for it

Ronald Bailey Owner/ Installer of VIBRATION CUSTUM SOUNDS. CUSTOM BOX DESIGNER AND BUILDER

TID-896 7" screen,Amp-BX1206d

4/0power/ground cables

4-12 mofos 12ft3 box tuned 40hz DB:163.1

bumflik

Copper - Posts: 58

Joined: January 03, 2008

Location: Florida, United States

Posted: March 03, 2009 at 5:33 PM / IP Logged

its just a box

stevdart

Platinum - Posts: 5,816

This member has made a donation to the12volt.com. Click here for more info.

This member has been recognized as an authority in Mobile Audio and Video. Click here for more info.

This member consistently provides reliable information

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: March 03, 2009 at 10:25 PM / IP Logged

Probably should use the whole airspace available, build a good braced box and net about 5.25 to 5.5 cu ft. Put a slot port vertically up one side of the front baffle, 3.5" x 13.5", 14" long (deep). Round off port edges including in the inside of the box, and round off the back side of the driver cutout.

That's not going to be the best SQ you can get out of that sub, but it will be loud.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

bumflik

Copper - Posts: 58

Joined: January 03, 2008

Location: Florida, United States

Posted: March 04, 2009 at 8:01 AM / IP Logged

ok thnx, yeah thats what i am doing with 4 cu.ft @ 35 hz. thnx. I was just worried about the air velocity in the ports, but i will round em out.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: March 04, 2009 at 9:08 AM / IP Logged

You'll need to make the port 20" deep (still 3.5 X 13.5 area) with net 4 cu ft box airspace. You might have to put a 90 degree bend at the end; you want to be sure to allow at least 3 or 4 inches of airspace between the end of the port opening and the wall. Port air velocity will be low and quiet with that port opening size.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

bumflik

Copper - Posts: 58

Joined: January 03, 2008

Location: Florida, United States

Posted: March 04, 2009 at 5:53 PM / IP Logged

i dont understand what you mean by "be sure to allow at least 3 or 4 inches of airspace between the end of the port opening and the wall. "

When I plug that port into WinISD I aam getting 80 ft/s and in order to avoid port noise it should be under 55 ft/s

soundnsecurity

Gold - Posts: 2,711

Joined: November 10, 2008

Location: Louisiana, United States

Posted: March 04, 2009 at 5:59 PM / IP Logged

the port is 3.5 inches wide, so the the end of the port that is inside the box needs to be atleast 3.5 inches from a wall. if it gets too close to a wall you need to make a 90 so the entire port will have the same width from beginning to end. and round off any edges if you can.

Search for other posts by soundnsecurity

bumflik

Copper - Posts: 58

Joined: January 03, 2008

Location: Florida, United States

Posted: March 06, 2009 at 12:07 AM / IP Logged

thnx but I decided to go with a port that is 13.5 x 5 x 32". I got this:

need box design for alpine type r 15 -- posted image.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: March 06, 2009 at 6:36 PM / IP Logged

1200 watts? We are talking about one sub?

Maybe be a little more realistic with wattage so you can keep that port structure at a minimum. The more volume you give to the port because of the very large opening area, the less air volume you have available for the driver...and the worse the low end drop off will be.

Use real RMS numbers and allow higher port noise than you would for a SQwannabe setup (the criteria is 10% Mach or 110 ft/sec for a vehicle, not 5%. This is SPL, not SQ.) Remember, your concern for this project is "really loud and efficient". Keeping box volume (dedicated to the driver...not the port) as large as possible will be a plus in the efficiency department.

Also note whether you have port air velocity valued at "peak" or "RMS" in your program. If it's showing peak, change it to RMS.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.