Slot Ported 18" Subwoofer Flat Pack - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 25Likes
 
Thread Tools
post #1 of 67 Old 02-18-2016, 05:54 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
Slot Ported 18" Subwoofer Flat Pack

Forum member LTD02 started the whole "MartySub" craze for ported 18's and 15's in fairly small but low tuned enclosures, so I want to make sure he gets credit for that idea and design.

Here's the next flat pack getting cut for the ported 18's. The prototype is here and the first run should be cut next week. I designed these to basically match what SubMaster-LTD02 thought up, but redesigned the way the box assembles and give a clean commercial look from the front. These go together just as easy as the ported 15" cube and also have letters carved in some of the panels to help with assembly.


Attached Thumbnails
Click image for larger version

Name:	Slot Port RS18.jpg
Views:	2030
Size:	88.4 KB
ID:	1263577  

_______________________
The SEOS Waveguide Project
Erich H is offline  
Sponsored Links
Advertisement
 
post #2 of 67 Old 02-18-2016, 06:04 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
I'm debating if these should be made out of the Carb-2 compliant highly refined MDF, or Baltic birch. They would take up two full 5' x 5' sheets of Baltic birch, so the price might get a bit high if we went that route.

Either way, these would have to ship in two packages per cabinet. I'm guessing each package would weigh about 55- 60lbs.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #3 of 67 Old 02-19-2016, 04:01 AM
Senior Member
 
Join Date: Oct 2015
Location: Chicago, IL
Posts: 352
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 127 Post(s)
Liked: 65
@Erich H what will the tuning be? Any idea on price yet?


Sent from my iPhone using Tapatalk
Mike Schacht is offline  
Sponsored Links
Advertisement
 
post #4 of 67 Old 02-19-2016, 05:11 AM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
Tuning will be just a little bit lower than the Marty versions and likely around 20hz or a little less. I think the Stonehenge came in around 18hz and this sub uses the same port size and internal volume.

Not sure on cost yet. I need to get the prices on the custom shipping boxes and then see how much Baltic would be over MDF and decide which direction to go with the type of wood used.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #5 of 67 Old 02-19-2016, 07:55 PM
Advanced Member
 
luisev's Avatar
 
Join Date: May 2009
Posts: 501
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 197 Post(s)
Liked: 111
I'll vote for MDF and since you're saying basically the same internal volume as the Stonehenge, it's 5.4 cu ft. correct?

DIYSG 893 | Emotiva ERD-1 | Dual DIY 18" Subs
Emotiva XMC-1 | XPA-2 | XPA-5 | Dual Crown XLS 2502
Samsung 58" Plasma | BenQ HT1075 100" Screen
Nvidia Shield | Oppo BDP-103 Bluray Player
luisev is offline  
post #6 of 67 Old 02-19-2016, 10:25 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
Yes, net volume should be right around where the Stonehenge model is.

Weight is 98 lbs.
luisev likes this.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #7 of 67 Old 02-20-2016, 01:41 PM
AVS Forum Special Member
 
Samps's Avatar
 
Join Date: Feb 2014
Location: Pittsburgh, PA
Posts: 2,728
Mentioned: 50 Post(s)
Tagged: 0 Thread(s)
Quoted: 1219 Post(s)
Liked: 901
How about Baltic birch just for the baffles? That would allow secure mounting with regular screws.

I bet these will be a hot item if the price is right.

Any chance of getting drivers also and make it a complete bundle? Or will this cab also be available at PE?
wvu80 likes this.
Samps is offline  
post #8 of 67 Old 02-21-2016, 03:15 PM
Senior Member
 
Join Date: Jul 2014
Location: Kailua-Kona, Hawaii
Posts: 265
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked: 54
Considering most will likely use duratex or something similar, I'd go with the MDF.
Michael Rodriguez is offline  
post #9 of 67 Old 02-21-2016, 03:19 PM
Newbie
 
Join Date: Feb 2016
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
I just came across this thread, my vote is for MDF with birch front baffle, i am interested in buying 2 when it become available.
Asahibots is offline  
post #10 of 67 Old 02-21-2016, 08:00 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
The one issue with making the outer baffle from birch is that the subwoofer gets recesses back at least .5". So the only plywood left to screw into would be .25", plus the 3/4" MDF behind it.

The other option would be to have the inner baffle cut from Baltic birch. My worry is that finishing plywood is a bit harder than finishing MDF due to the plylayers showing up easier when painting. So I don't know how that would look if the inner baffle ended up finishing with a different look than the rest of the box.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #11 of 67 Old 02-21-2016, 09:42 PM
Senior Member
 
Join Date: Jul 2014
Location: Kailua-Kona, Hawaii
Posts: 265
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked: 54
Quote:
Originally Posted by Erich H View Post
The one issue with making the outer baffle from birch is that the subwoofer gets recesses back at least .5". So the only plywood left to screw into would be .25", plus the 3/4" MDF behind it.

The other option would be to have the inner baffle cut from Baltic birch. My worry is that finishing plywood is a bit harder than finishing MDF due to the plylayers showing up easier when painting. So I don't know how that would look if the inner baffle ended up finishing with a different look than the rest of the box.
I'm not sure I see the real advantage of using birch over mdf. I've never had an issue with screwing into MDF. It seems as though it would complicate things having to use two materials. It would also raise the price a bit.

With MDF, if you pre drill the screw holes, it is a very good material to screw into. You don't need to torque the screws a ton, just enough clamping force to close the gaps which is usually easy with MDF seeing as how it is generally a pretty flat material.
Michael Rodriguez is offline  
post #12 of 67 Old 02-22-2016, 06:28 PM
Member
 
Daanger411's Avatar
 
Join Date: Dec 2012
Location: Portland Oregon
Posts: 29
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked: 11
What do you think the price discrepancy would be between BB ply and MDF, possibly save a couple $$ shipping? I prefer BB when working with it, but if it's premade I suppose I'd have to reevaluate my personal bias. It's not like the weight difference would be too much or that big of a deal since you really don't move these things often.
Daanger411 is offline  
post #13 of 67 Old 02-22-2016, 07:37 PM
Senior Member
 
rondi's Avatar
 
Join Date: May 2001
Posts: 373
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Liked: 56
Quote:
Originally Posted by Erich H View Post
The one issue with making the outer baffle from birch is that the subwoofer gets recesses back at least .5". So the only plywood left to screw into would be .25", plus the 3/4" MDF behind it.
Folks have mentioned gluing a piece of plywood on the inside for the screw threads to bite into. I have never stripped MDF either and but I always had more than 1/4" to screw into. I would probably glue a piece of hardwood. Either way they need to be predrilled.
rondi is offline  
post #14 of 67 Old 02-23-2016, 05:59 AM
AVS Forum Special Member
 
Jk7.2's Avatar
 
Join Date: Apr 2015
Location: Detroit area
Posts: 2,861
Mentioned: 75 Post(s)
Tagged: 0 Thread(s)
Quoted: 1394 Post(s)
Liked: 2545
Very cool these flat packs are in the works. I am interested in two when they are available. I hope they are mdf only because of cost. But I would most likely buy either way. Thanks Erich!
Jk7.2 is online now  
post #15 of 67 Old 02-25-2016, 02:11 PM
Advanced Member
 
luisev's Avatar
 
Join Date: May 2009
Posts: 501
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 197 Post(s)
Liked: 111
Curious if a price point has been established...

DIYSG 893 | Emotiva ERD-1 | Dual DIY 18" Subs
Emotiva XMC-1 | XPA-2 | XPA-5 | Dual Crown XLS 2502
Samsung 58" Plasma | BenQ HT1075 100" Screen
Nvidia Shield | Oppo BDP-103 Bluray Player
luisev is offline  
post #16 of 67 Old 02-25-2016, 07:45 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
I won't know until they're cut. They will likely be done next week.
dandiele likes this.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #17 of 67 Old 02-26-2016, 08:32 PM
 
Join Date: Feb 2016
Location: Connecticut
Posts: 233
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 134 Post(s)
Liked: 24
Which driver(s) will the baffle be cut for? I'm really happy to see this kit. As you know, I'm eager for a HST18 box :-). My guess is it will be the UM18-22 or RS HO.


Sent from my iPhone using Tapatalk
[email protected] is offline  
post #18 of 67 Old 02-26-2016, 08:59 PM
Senior Member
 
rjh65@verizon.ne's Avatar
 
Join Date: May 2007
Posts: 423
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 241 Post(s)
Liked: 66
Quote:
Originally Posted by Erich H View Post
I'm debating if these should be made out of the Carb-2 compliant highly refined MDF, or Baltic birch. They would take up two full 5' x 5' sheets of Baltic birch, so the price might get a bit high if we went that route.

Either way, these would have to ship in two packages per cabinet. I'm guessing each package would weigh about 55- 60lbs.
My vote would be baltic birch, lighter and stronger. I would pay the extra money for a higher quality wood. I have too much past experience with MDF.


[email protected] is offline  
post #19 of 67 Old 02-27-2016, 07:38 AM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
Old MDF is not great. The MDF that gets used on all of the newer cabinets is Carb 2 compliant and it's highly refined.......nothing like what you get at Lowes or Home Depot. The edges are very sharp with no 'fluff'. Actually, you can almost cut yourself on the edges.


[email protected], these will be cut for the Dayton RS-18, and the past SI-18. Some people were using the more expensive Stereo Integrity 18" in the same enclosure size, so that will likely work. I don't know how the Ultimax would do in this size enclosure.
luisev and [email protected] like this.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #20 of 67 Old 02-27-2016, 09:01 PM
Senior Member
 
thucker's Avatar
 
Join Date: Feb 2012
Posts: 228
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 74 Post(s)
Liked: 33
This is exactly what I want!! Can you tell me the size and length of the port? I want play around with WinISD and see which of the drivers I have will model best in this box, I have a pair of RS460s and SI18 D2s.
thucker is offline  
post #21 of 67 Old 02-29-2016, 02:53 PM
Member
 
Join Date: Feb 2016
Location: Austin, Tx
Posts: 74
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Liked: 10
I would be interested in a pair once they are available. Will this be a replacement for the Stonehenge or will you still occasionally have the Stonehenge available.
ls1ssz is offline  
post #22 of 67 Old 02-29-2016, 03:05 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
ls1ssz, I don't think it will be a replacement, but this shape will likely appeal to more people. If I can find room I will likely get the Stonehenges done again.


thucker, they're roughly 5.4 or 5.5cuft and tuned around 20hz like the Stonehenge model.
luisev likes this.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #23 of 67 Old 03-03-2016, 06:38 PM
Advanced Member
 
Scrappydue's Avatar
 
Join Date: Oct 2012
Posts: 639
Mentioned: 75 Post(s)
Tagged: 0 Thread(s)
Quoted: 257 Post(s)
Liked: 218
I bet your gonna have a rough time keeping these in stock. Love that new products keep on coming.
wvu80 likes this.
Scrappydue is offline  
post #24 of 67 Old 03-03-2016, 06:45 PM
 
Join Date: Feb 2016
Location: Connecticut
Posts: 233
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 134 Post(s)
Liked: 24
Slot Ported 18" Subwoofer Flat Pack

Expected preorder date for SI?

Can you post the exact volume as well as port length and area so I can plug the driver in and see what kind of turbulence, tune, and curve I can expect with an HST?

Looking very much forward to them.


Sent from my iPhone using Tapatalk
[email protected] is offline  
post #25 of 67 Old 03-03-2016, 08:27 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
All programs will give you different numbers because they don't take into account where the port is inside the enclosure. There's also a discussion in the DIY section about chuffing and different port sizes. I would think there are lots of curves posted for the SI-18, Dayton RS-18, and the HST in that section as well. I'll see what I can find.

Having said that, this enclosure is modeled by forum member LTD02 and was designed to be just a bit bigger than the original 'MartyCube' that so many people have built. It comes in around 5.4cuft with a port area 42 sq inches and I believe about 42" long or so. It's the same internal volume as the Stonehenge with the same sized port. The tuning on the Stonehenge was tested with an OmniMic to be 18.5hz. There were a few people using the bigger HST in the Stonehenge with good results.


I just put them up on the site, but they won't be cut until next week. I won't know the price until they're cut and figure in packaging material, Paypal fees, etc.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #26 of 67 Old 03-04-2016, 08:11 AM
Senior Member
 
dandiele's Avatar
 
Join Date: Feb 2012
Posts: 417
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 116 Post(s)
Liked: 39
Sweet, keep it up Erich cause I need a couple more subs to replace the single stonehenge I have!
dandiele is offline  
post #27 of 67 Old 03-04-2016, 09:39 AM
Member
 
Daanger411's Avatar
 
Join Date: Dec 2012
Location: Portland Oregon
Posts: 29
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked: 11
Any possibility of having an option without round overs?
Daanger411 is offline  
post #28 of 67 Old 03-04-2016, 01:13 PM - Thread Starter
AVS Forum Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 7,350
Mentioned: 290 Post(s)
Tagged: 3 Thread(s)
Quoted: 1846 Post(s)
Liked: 2642
I'm not sure how I'm going to work the roundovers yet. The problem is how many options it makes things. With 2 woofer cutouts and with or without roundovers, it's 4 different options. So if I get 50 enclosures cut, I only have 12 of each option.

_______________________
The SEOS Waveguide Project
Erich H is offline  
post #29 of 67 Old 03-04-2016, 04:20 PM
Member
 
Daanger411's Avatar
 
Join Date: Dec 2012
Location: Portland Oregon
Posts: 29
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked: 11
Quote:
Originally Posted by Erich H View Post
I'm not sure how I'm going to work the roundovers yet. The problem is how many options it makes things. With 2 woofer cutouts and with or without roundovers, it's 4 different options. So if I get 50 enclosures cut, I only have 12 of each option.
Totally understandable. Thanks for keeping us in the loop.
Daanger411 is offline  
post #30 of 67 Old 03-04-2016, 04:38 PM
Advanced Member
 
mobeer4don's Avatar
 
Join Date: Feb 2010
Posts: 786
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 163 Post(s)
Liked: 154
Is the port design such that the end user could change the length (cut it off or add to it) somewhat to change the tuning? Obviously that would require some skill and effort on the end users part but could minimize the requests for multiple designs for different tunings. Maybe include a chart that says cut parts X, Y, & Z to whatever length to get a particular Fb.

No need to thank me for thinking up more work for you to do
mobeer4don is offline  
Sponsored Links
Advertisement
 
 

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


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