PDA

View Full Version : My box, input wanted...



arsonbob
05-09-2006, 04:07 AM
This is the plan for my box. I didn't feel like giving demensions in sketchup so i'll type them. The back rectangle is 5.25" deep 9.5" high and 38" long. The two identical wedges are 14" deep, 15" high1, 5" high2, and 13" long each. The middle section is 14"deep, 12" high1, 2" high2, and 12" long. I am throwing two kicker comp's 12's 150rms each, introductory level for me. I got them uber cheap so I won't complain. The middle section is obviously for my amp. Kicker recommends about 2.5 cubes of volume and This box has about 2.3 cubes, I'm gonna settle. Let me know what you think. If it will work/sound okay. I don't really know how to estimate the hz it will be... if someone can help me that'd be great. I was shooting for 32. Excuse my screenshots.

(I designed it to fit over the wheel well in my ford explorer)

http://img56.imageshack.us/img56/4244/box26ha.png

http://img56.imageshack.us/img56/6695/box37ju.png

http://img56.imageshack.us/img56/9877/box45vv.png

kpozr2
05-09-2006, 01:05 PM
looks pretty sweet, what program did you use to design that?

joeldirt
05-09-2006, 01:16 PM
looks pretty sweet, what program did you use to design that?

sketch up...



dude... that box looks really nice.... Keep that design, and make sure to get allot of good pics. I'd like to see the finished product. Other then that... Very sturdy design, everything serves as a brace so you do not have to brace much inside... (other then maybe in the middle between the subs behind the amp rack.. basically a chamber devider. asthetically pleasing to the eye, and should give a real nice clean install... Good job.

arsonbob
05-10-2006, 03:41 AM
anyone else got anything to add before i get started on this thing?

arsonbob
05-11-2006, 01:43 AM
Well.. I kind of confused. How do you calculate or know what hz the box is going to be? i was shooting for 30-35. Either one is fine.

Pop da Hatch
05-11-2006, 01:45 AM
Wheres the port? Looks sealed to me....

j3bus2k3
05-11-2006, 01:46 AM
Fb, the enclosure's tuning frequency is a function of enclosure net volume and port area...

http://mobile.jlaudio.com/support_pages.php?page_id=165

arsonbob
05-11-2006, 02:11 AM
Wheres the port? Looks sealed to me....

It's a sealed box

arsonbob
05-11-2006, 02:16 AM
So my conclusion is that sealed boxes do not have ports and therefore tuning based on hz, correct?

j3bus2k3
05-11-2006, 02:17 AM
sealed boxes dont not have tuning frequencies at all...They are designed around a number referred to as Qtc which is beyond my current understanding.

arsonbob
05-11-2006, 02:28 AM
sealed boxes dont not have tuning frequencies at all...They are designed around a number referred to as Qtc which is beyond my current understanding.

Hah okay. Even after days and nights of reading pages and pages of tutorials, not once was it ever clearly stated that sealed boxes do not require tuning. Thank you for finally clearing that up. Makes life much easier and less confusing for me. That is a good piece of info for noobs like myself.

j3bus2k3
05-11-2006, 02:29 AM
lol no problem. All you need to do is build an airtight box to a certain volume...thats it. No ports, no tuning, just 6 walls and no air leaks...

LeofromtheH
05-11-2006, 02:31 AM
looks good so far. good luck. where can u download that program?

arsonbob
05-11-2006, 02:32 AM
lol no problem. All you need to do is build an airtight box to a certain volume...thats it. No ports, no tuning, just 6 walls and no air leaks...

Yeah sounds good, I'm going to stick with my above plans, with minor modifications which will only make the final install cleaner looking. Carpet is in the plans, but far off for now. Thanks for the help.

j3bus2k3
05-11-2006, 02:34 AM
no problem.

snoopdan
05-11-2006, 02:40 AM
Nice box layout, well done....might wanna get some polyfill to play with tuning it / tweak its response to your likeing.

PowerNaudio
05-11-2006, 03:06 PM
righ you dont tune it since it dont have a port. but the internal volume of the sealed enclosure needs to be closely calculated in order to get a nice frequency responce. too small of an enclosure and you wont hear the low end bass loud enogh, too big and your sub could bottom out.

arsonbob
05-11-2006, 08:08 PM
looks good so far. good luck. where can u download that program?

Just search google sketchup at google.com. Easy as pie to learn after a bit. Kinda tricky at times though. Do the tutorial, it helps a lot.

arsonbob
05-11-2006, 08:13 PM
righ you dont tune it since it dont have a port. but the internal volume of the sealed enclosure needs to be closely calculated in order to get a nice frequency responce. too small of an enclosure and you wont hear the low end bass loud enogh, too big and your sub could bottom out.

Yeah thanks. I got that much down luckily. I am going to be about .1-2 cubes short, so i'll settle with that. Do you recommend I use polyfill? I was to the understanding that that is to be used when you intend to make the enclosure smaller.

PV Audio
05-11-2006, 08:15 PM
Google sketchup isn't sketchup btw ;)