Dunavin’s OTop 8 build

Post your build odyssey here.
Message
Author
User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#31 Post by J_Dunavin »

Band saw is the key with these guys!
12962869-F01A-445F-AAE9-568E6BE5787E.jpeg
12962869-F01A-445F-AAE9-568E6BE5787E.jpeg (34.97 KiB) Viewed 42501 times
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#32 Post by J_Dunavin »

Well this was a messy endeavor.
Only big suggestion here is to cut just a little big, then test fit, trim a little, test fit and so on.
Not sure how to clamp things in place so I used as little PL as I thought I could comfortably use and am letting it sit.
Too much and not only is it a giant mess, but it’ll slid around a bunch.
This will work… going to need some wood filler , but it’s looking like a speaker 😁
Attachments
FE73852A-8ED7-4F06-B223-718DE05DE1CF.jpeg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

mj90210
Posts: 79
Joined: Fri Feb 03, 2017 2:12 pm
Location: Montana-USA

Re: Dunavin’s OTop 8 build

#33 Post by mj90210 »

Nice build thread! I can't tell from your pictures but a 23guage pin nailer is the handiest tool. Even if you do use one I can't stress enough for others to get one. Looking forward to your review.

Edit, I see you have built a pile of cabinets...You know the drill.
Thank You All for Your Time!!...Really!

Built:
2xDR300's
4xDual-30” Tuba 60’s
Simplex 21" Eminence NSW6021
1x20” THT
TLAH‘S
SLA Center-9 driver and Surrounds
SLA pros
TrT 10" Driver-10" Wide
Auto Tuba 10" Driver

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#34 Post by J_Dunavin »

Ya I need a smaller pin nailer. I do have one and I used it in the bigger pieces, but I was worried it would split these four internal pieces. And I’m not sure how to pinch the middle, where it comes together

You’ve built quite the stack yourself!
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#35 Post by J_Dunavin »

Test fit, 2nd cab
F299F48E-7FF8-4B2B-9495-1518FBC7E530.jpeg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#36 Post by J_Dunavin »

While the glue is setting up on the 2nd cab throat pieces, I turned back to the CD horn.
A little out of order according to the plans, but I was worried about the those three angled pieces not being squared up on the horn. I also measured the cabs and one is a 16th tall and the other a 16th short, at least vertically up the middle. I left the horn pieces long, but marked then right at 21”. My plan is to take the sander to them and end up with snug fit.
I also sanded the back smooth and 1/4 rounded the edges. Won’t make a bit of difference, but why not 😄
E7AD81BF-D4A3-461C-B245-27DA5BBBA730.jpeg
E7AD81BF-D4A3-461C-B245-27DA5BBBA730.jpeg (35.07 KiB) Viewed 42459 times
5999DECF-6EBF-43A9-8E95-D1D1155649B3.jpeg
5999DECF-6EBF-43A9-8E95-D1D1155649B3.jpeg (35.13 KiB) Viewed 42459 times
9714834E-D343-47FF-8B72-CF99C36695A3.jpeg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#37 Post by J_Dunavin »

Still couldn’t figure out a way to pinch this closed, even tried the Mrs’ clothes pins 🤷🏻‍♂️ Oh well just fill it with PL😄
7271130C-BF8B-465A-9D1D-11D42900CE1A.jpeg
6D5AC578-22D1-45B0-816A-7441282E2513.jpeg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Dunavin’s OTop 8 build

#38 Post by Bruce Weldy »

Looking great. Makes me want to make some sawdust......

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

User avatar
Seth
Posts: 2733
Joined: Thu Sep 10, 2009 8:06 pm
Location: Sacramento, California, USA
Contact:

Re: Dunavin’s OTop 8 build

#39 Post by Seth »

J_Dunavin wrote: Sat Apr 16, 2022 10:25 am Still couldn’t figure out a way to pinch this closed
Masking tape should do.

The project's looking real good Joe! :thumbsup:
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

User avatar
Chris_Allen
Posts: 3355
Joined: Wed Jul 11, 2007 2:43 pm
Location: Huddersfield, UK

Re: Dunavin’s OTop 8 build

#40 Post by Chris_Allen »

There's something about the look of the OTop8 that I really like. One day, I will build a set of 6 and replace my DR200's.
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#41 Post by J_Dunavin »

Chris_Allen wrote: Sun Apr 17, 2022 6:30 am There's something about the look of the OTop8 that I really like. One day, I will build a set of 6 and replace my DR200's.
Ya they do look really sharp! I’m excited to review them compared to my stack of DR200s.
L
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#42 Post by J_Dunavin »

HAPPY EASTER!

Lot's of work over the weekend, almost operational with the OT8s ! Will need a bit of finish work.

Here i cut the hole for the CD driver, and broke the edge a little on the side that is going out to the rest of the horn. Probably won't make a difference, but i am trying to smooth out all the hard edges in the sound path.
breaking the edge.jpg
Gluing them down
plate.jpg
filling the little gaps with woof filler
cd horn gap.jpg
fill it.jpg
Here is the rough and sanded ends of the horn.
My suggestion here is to sand a little and hold it up to the cabinet, mark were you need to take some off and sand a little more until it fits.
Also, fit one cd horn per cab, no two will be exactly the same dimension, i mean it's close, but you really want a snug fit here. As you can also see one of my plates is not square. It's ok, but had i used it as my reference, the horn would sit funny.
sanding the CD horn.jpg
ch horn not even.jpg
test fit horn.jpg
Almost there!!
test horn front.jpg
test horn left.jpg
Last edited by J_Dunavin on Sun Apr 17, 2022 8:54 pm, edited 1 time in total.
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#43 Post by J_Dunavin »

Back braces, again i made these long and wide when i glued them together. Only after they dried did i cut the 1" x1" strips out. I also left them long and trimmed to fit as both cabs are off by a couple 32nds. Which i nothing really, but when you are trying to get an tight fit, it matters.
Attachments
Back braces.jpg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#44 Post by J_Dunavin »

fill the gaps :lol:
Attachments
wood filler.jpg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

User avatar
J_Dunavin
Posts: 1260
Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
Contact:

Re: Dunavin’s OTop 8 build

#45 Post by J_Dunavin »

I went off the reservation on this one, but I figured it would actually be safer to make the hole for the top hat as an assembly AND it helps ensure the holes are lined up.
Go very slow and clear the chips often. Don’t put a lot of pressure on the horn plate so as to not splinter the edges.
I also glued a doubler in there as I’m going to router the top hat flush. Will be removing some material on the bottom. Probably helped act as a guide as well.
E92F5D46-E2FB-4AA3-842A-E79AB291D956.jpeg
C40ABBA6-A320-4CC3-B85A-3FA078BA2E53.jpeg
BB9E9F2E-9577-44B9-BA74-3EA819283558.jpeg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

Post Reply