Vented sub box design help!! - AVS Forum
Forum Jump: 
 
Thread Tools
Old 02-14-2014, 11:54 AM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
I have 4 mach 5 UXL's ordered and what to get boxes built for them, found Baltic Birch on sale locally till Feb 22. So I want to get going on it while I can save some money on the wood.

Requirements are as follows:

Tune between 15 and 18 Hz

Foot print can be 20 inches wide ( have 21 inches from screen frame to side wall) by 24 inches deep ( can be less don't want more) height can be 60 inches high (sheets come in 60 inches by 60 inches).

Can get either 3/4 inch (18mm) 13 ply stuff that's on sale $59 per sheet or 1 inch (24mm) 18 ply at 90 per sheet not on sale. What would be better? By other builds I assume 3/4 is fine with double front baffle.

I will be using JTR 212HT-Lp for LCR and either Slant 8 for side and rears or DIY sound V-8's

Thanks in advance, I'm lost with design software!!
BrentTHX is offline  
Sponsored Links
Advertisement
 
Old 02-14-2014, 12:15 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Sorry for some reason it double posted, can't find place to delete it. If Mod could remove double post?
BrentTHX is offline  
Old 02-14-2014, 12:37 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Hey Brent, I'll be glad to help you out to a degree but I'm out the door. If no one steps in, I'll help you out latter. You might want to post how much power you plan on feeding each driver and if you want 4 individual subs or two drivers in a X2 enclosure/sub. The 3/4 would work just fine braced correctly but by no means is the 1" a bad idea.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 12:52 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
I will be powering subs with 2- Inuke 6000 maybe dsp, can get them pretty cheap and may go dsp and give that a try instead of dspmini. Or will go with 1- IPR2 7500 with a dsp mini. They will all be in separate boxes, one in each corner of the room. I can't lay them down under screen as I'm putting electronics under it.
BrentTHX is offline  
Old 02-14-2014, 03:19 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Here are two projects that you might be interested in? The first one started as a two driver option X2 but then turned into a quad. See what you think and then we can work from there. Here is another link that might be of use to you also. http://www.avsforum.com/t/1516043/my-ported-uxl-18-in-9-9cf-x2

http://www.avsforum.com/t/1506201/unnamed-sub-build

http://www.avsforum.com/t/1516043/my-ported-uxl-18-in-9-9cf-x2

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 03:54 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by steve nn View Post

Here are two projects that you might be interested in? The first one started as a two driver option X2 but then turned into a quad. See what you think and then we can work from there. Here is another link that might be of use to you also. http://www.avsforum.com/t/1516043/my-ported-uxl-18-in-9-9cf-x2

http://www.avsforum.com/t/1506201/unnamed-sub-build

http://www.avsforum.com/t/1516043/my-ported-uxl-18-in-9-9cf-x2

Yes I have followed I think every build thread. Just my restricted demension's make port and everything different? JB build works if I can put driver on 22 inch side, but make it 20 instead. Don't know how to model changes. Anything works for me with port and driver on 20 inch side. I have wall on one side and screen on the other with electronics under it. So I didn't think I wanted port or driver firing into electronics cabinet?

BrentTHX is offline  
Old 02-14-2014, 03:59 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Ok gotcha! Lets see....

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 04:54 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Ok lets see how this sounds going with the measurements you stated. It turns out I needed all the volume supposing we need 3cf displacement. We will need to adjust a little most likely but then maybe not. Total enclosure 20W X 24D X 60H 14cf.
11cf internal after displacement 18hz tune. 2 slot vents 4 X 8.88 X 48.5 long with a hp at 17hz. 1st port resonance 139.37 Air velocity 26.

I’ll let you digest this and reply on a different computer. I’ll not have the use of WinISD until tomorrow morning though. Your SPL is off the chart at 120-122dB though. This is good yes? Oh I can post the graphs for you too or VI PM tomorrow.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 06:05 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17

Sounds good!! 4 of them should hammer pretty good? Room is 3000 CF plus or minus a little. 14' wide X 25' 9" X 8'3". Is it a good idea to put them one in each corner? The front and back ones would fire towards each other. By two slot vent you me one vent with a divider/brace in middle splitting it in half? Sorry for all the newbe questions. Have done a ton of subs for cars but everyone has been sealed. And always had manufacture telling me box size for what I wanted it to sound like.

BrentTHX is offline  
Old 02-14-2014, 07:16 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by BrentTHX View Post

Sounds good!! 4 of them should hammer pretty good? Room is 3000 CF plus or minus a little. 14' wide X 25' 9" X 8'3". Is it a good idea to put them one in each corner? The front and back ones would fire towards each other. By two slot vent you me one vent with a divider/brace in middle splitting it in half? Sorry for all the newbe questions. Have done a ton of subs for cars but everyone has been sealed. And always had manufacture telling me box size for what I wanted it to sound like.

You never know what works out best for sub placement but you'll have plenty to work with that's for sure. Try each corner to start out and work from there. Yes one 3/4 divider down the middle. I tried to go three slots but it didn't work out. It would of helped you for bracing purposes but we you can work around it, it's not very wide so you're good.

Ok this is what I would like you to do. Go to the link I provided and figure how much volume your vent is going to take up. Minus 1.5" off the length of your vent when factoring. EDIT> Factor in the 3/4 ply also as part of your vent. Lets plan on incorporating 1" dowel to save space and weight (if that works for you) but in no way effecting the integrity of your enclosure. If you like factor in the driver also and I'll factor the bracing.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 09:22 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by steve nn View Post


You never know what works out best for sub placement but you'll have plenty to work with that's for sure. Try each corner to start out and work from there. Yes one 3/4 divider down the middle. I tried to go three slots but it didn't work out. It would of helped you for bracing purposes but we you can work around it, it's not very wide so you're good.

Ok this is what I would like you to do. Go to the link I provided and figure how much volume your vent is going to take up. Minus 1.5" off the length of your vent when factoring. EDIT> Factor in the 3/4 ply also as part of your vent. Lets plan on incorporating 1" dowel to save space and weight (if that works for you) but in no way effecting the integrity of your enclosure. If you like factor in the driver also and I'll factor the bracing.

What linc? the earlier ones? or is there another? OK I will figure out vent, I think i know what you mean. I take the area that the vent uses up so it gets subtracted from the box volume?

BrentTHX is offline  
Old 02-14-2014, 09:47 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Sorry about that, looks like I had the same link posted twice or something. Use the brace calculator as a solid, very easy..

http://www.hometheatershack.com/forums/enclosure-volume-calculator/

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-14-2014, 09:54 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by steve nn View Post

Sorry about that, looks like I had the same link posted twice or something. Use the brace calculator as a solid, very easy..

http://www.hometheatershack.com/forums/enclosure-volume-calculator/

Thanks!!! I'm so lost on vented!! LOl  Crazy part is my stereo in my car has to be worth 50 grand all built be myself, but when it comes to this I'm lost.

BrentTHX is offline  
Old 02-14-2014, 10:10 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
i think this is what steve is talking about, but i'm not 100% sure...

it would be really simple and perform great. single slot port running down the back and firing up. if that is a cool design for you, all you really need to do is pick a tuning frequency and the port length can be calculated.


Listen. It's All Good.
LTD02 is offline  
Old 02-14-2014, 10:17 PM
AVS Special Member
 
jbrown15's Avatar
 
Join Date: Nov 2005
Location: Vancouver B.C.
Posts: 6,584
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1240 Post(s)
Liked: 1201
Quote:
Originally Posted by LTD02 View Post

i think this is what steve is talking about, but i'm not 100% sure...

it would be really simple and perform great. single slot port running down the back and firing up. if that is a cool design for you, all you really need to do is pick a tuning frequency and the port length can be calculated.


That would look pretty cool!
jbrown15 is online now  
Old 02-14-2014, 10:22 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17

Ok if I did it right the port takes up 2090 sq inches or 1.029 sq feet. I haven't found sub displacement  but I know I seen it before, think its .243 cubic feet. will look tomorrow getting late here.

BrentTHX is offline  
Old 02-14-2014, 10:24 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
"That would look pretty cool!"

yeah, it's so strange. it's like you never know if it is going to have the cool factor until it is drawn up. i agree, that one does have it.

Listen. It's All Good.
LTD02 is offline  
Old 02-14-2014, 10:26 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by LTD02 View Post

i think this is what steve is talking about, but i'm not 100% sure...

it would be really simple and perform great. single slot port running down the back and firing up. if that is a cool design for you, all you really need to do is pick a tuning frequency and the port length can be calculated.

I'm good with anything as long as foot print is 20 X 24 thats all that matters, it will be behind false Colum .I'm more worried about performance than anything.

BrentTHX is offline  
Old 02-14-2014, 10:26 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
"Ok if I did it right the port takes up 2090 sq inches or 1.029 sq feet. I haven't found sub displacement but I know I seen it before, think its .243 cubic feet. will look tomorrow getting late here."

great.

with these largish low tuned cabs, there is some slop factor. if something is off by 1/2 a cubic foot it isn't going to mess up the sub. just something to keep in mind and reduce the stress factor. :-) anything to reduce the stress factor. :-)

Listen. It's All Good.
LTD02 is offline  
Old 02-15-2014, 02:13 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by LTD02 View Post

i think this is what steve is talking about, but i'm not 100% sure...

it would be really simple and perform great. single slot port running down the back and firing up. if that is a cool design for you, all you really need to do is pick a tuning frequency and the port length can be calculated.


Bravo John, that looks great! If he vented out the top he wouldn't need to bend the slot. I was going everything from the front like asked. So all said and done we would be looking at 2.5cf for the vent and another .6 or so for the driver and dowel bracing. Tight, but like you say we have play.

EDIT> I see we have plenty going with the dowels including driver displacement though. Comes out next to perfect! smile.gif mm

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-15-2014, 06:40 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17

Looks good guys, can someone post up graphs of driver/box curves? So port out of top makes no difference to sound compared to front port?  Sorry for the slow reply was mudding walls in theatre all day. Took 9 hours do get first coat on, but I guess that what happens when there is 45 screws in every sheet of drywall! LOL 

BrentTHX is offline  
Old 02-15-2014, 06:53 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
uxl 11 cubic feet ~16hz tune 2200 watts. no room gain. no equalization. just raw response.

the port at the top will function the same as if it was on the front. just easier to build and "wind" blows up instead of forward. :-)


Listen. It's All Good.
LTD02 is offline  
Old 02-15-2014, 06:53 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
"Sorry for the slow reply was mudding walls in theatre all day. Took 9 hours do get first coat on, but I guess that what happens when there is 45 screws in every sheet of drywall! LOL"

:-)

Listen. It's All Good.
LTD02 is offline  
Old 02-15-2014, 07:34 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
I see your cutting back the power by a 3rd thus making things work out with a 16hz tune. I was thinking he ought to come in at 16hz when all was said and done at 3000 like OP stated.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-15-2014, 07:47 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Thanks guys!
BrentTHX is offline  
Old 02-15-2014, 07:59 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
You would want your slots at 3" instead of 4" now 46.5 long. There's a few variables but that'll put you close.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-15-2014, 08:03 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Ok so that's with the port coming out top then? Which is fine by me. I should be able to figure out the lumber order from that. smile.gif
BrentTHX is offline  
Old 02-15-2014, 08:14 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by BrentTHX View Post

Ok so that's with the port coming out top then? Which is fine by me. I should be able to figure out the lumber order from that. smile.gif

Yes, be sure to run the divider down the middle like previously suggested. Since your doing 4 subs I doubt very much you would have any air velocity issues if you're still going to feed them 3000w each, but you are up there at 28m/s at 3000w. It would take some serious sine tones to put you there though.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Old 02-15-2014, 08:30 PM - Thread Starter
Member
 
BrentTHX's Avatar
 
Join Date: Dec 2013
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
If I'm feeding them that much power, I'm probably drunk and in party mode so port noise probably wouldn't matter any ways! Lol
BrentTHX is offline  
Old 02-15-2014, 08:51 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
LOL.. yeah you have a good point there but I wasn't going to bring it up. smile.gif well I opted to put it in a different way. You can round your vent ends with a round-over bit if you have a router also.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
 
Thread Tools


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off