Dunavin’s OTop 8 build

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J_Dunavin
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Dunavin’s OTop 8 build

#1 Post by J_Dunavin »

Start of a very slow build…
No beauty contest here, but will be functional.
Image
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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

Re: Dunavin’s OTop 8 build

#2 Post by Bruce Weldy »

Looks nice.

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."

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J_Dunavin
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Location: Appleton WI
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Re: Dunavin’s OTop 8 build

#3 Post by J_Dunavin »

Thanks Bruce!
I’ve got it wired up to the ASDs and Betas for testing.
It makes music 8)
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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Seth
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Location: Sacramento, California, USA
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Re: Dunavin’s OTop 8 build

#4 Post by Seth »

Sweet. Congrats on kicking off the new project :thumbsup:

How many tops are you making this time around?
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

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J_Dunavin
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Re: Dunavin’s OTop 8 build

#5 Post by J_Dunavin »

Not as many as I’d like 😄
This will be a very small, very mobile, rig. Two tops and two MAYBE four T39s
I loved my six DR six Tuba set up, but never had a chance to use it all together. Just took up too much room.
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

DaveMacKay
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Joined: Tue Aug 03, 2021 3:10 pm

Re: Dunavin’s OTop 8 build

#6 Post by DaveMacKay »

Good luck with the build.

howiez
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Joined: Sun Mar 16, 2014 5:23 pm
Location: Fox Valley, Wisconsin

Re: Dunavin’s OTop 8 build

#7 Post by howiez »

Looks great, I'm about to build crossovers for my DR200's dragging my feet as it'll be no beauty contest winner either!

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J_Dunavin
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Re: Dunavin’s OTop 8 build

#8 Post by J_Dunavin »

Here's a few pictures, hard to find any time these days, though Spring is around the corner :hyper:

Here i drew a line a line on my cross cut sled, to help me line up a stop block for cutting the CD horn pieces. I also made my original cuts bigger than necessary, so that i could cut up to the line.
marking 60 deg.jpg
cutting up to the line.jpg
test cut.jpg

Test fit :D
test fit comp horn peices.jpg

Drawing out the OT8 speaker mounting plate
OT8 back plate.jpg

AND the mail man was nice to me today! worth the wait! Now i wish i would have ordered four...
small speakers.jpg
small speakers 2.jpg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

T_Gowan
Posts: 164
Joined: Sun Sep 09, 2007 7:10 pm
Location: Allenford, Ontario, Canada

Re: Dunavin’s OTop 8 build

#9 Post by T_Gowan »

That pool table will make a nice flat surface to build on. I'm not a pool player so it would work for me anyway lol
DR200 x2
T24 16" x2
T39 20" x2
DCX2496
DEQ2496 x2
FBQ2496
Mackie DL1608

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J_Dunavin
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Location: Appleton WI
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Re: Dunavin’s OTop 8 build

#10 Post by J_Dunavin »

Ha! Indeed it would make for a great build table.
I do play and once in awhile convince the wife to play a few rounds. Somehow she mistakes it for a laundry table 🤔
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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J_Dunavin
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Location: Appleton WI
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Re: Dunavin’s OTop 8 build

#11 Post by J_Dunavin »

The OT8 plans call for a phase plug extension, these are flat disc. Would there be any advantage to making them similar to the throat filter called out in the DR plans?
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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Bill Fitzmaurice
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Re: Dunavin’s OTop 8 build

#12 Post by Bill Fitzmaurice »

I tested various configurations, what's in the plans is what worked best.

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J_Dunavin
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Re: Dunavin’s OTop 8 build

#13 Post by J_Dunavin »

Will do then, thank you Bill! 👍
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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J_Dunavin
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Re: Dunavin’s OTop 8 build

#14 Post by J_Dunavin »

Working on the CD horn.
I tried to glue everything as straight as i could, but ended up with some unevenness.
Comp horn back.jpg

Nothing a sanding block can't knock down.
Comp horn back sanded.jpg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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J_Dunavin
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Location: Appleton WI
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Re: Dunavin’s OTop 8 build

#15 Post by J_Dunavin »

Kicking into full build mode now, as i have a gig on the 22md and 23rd :noob:
I'd love to get my T39s done as well, but if i can just get the OT8s done, it'll me a miracle. Which actually, for this gig, will be fine if there are no subs.
Going to try and grab as many pictures as i can along the way.

Just a blank for the CD driver, I did draw out the outline, center hole and mounting holes in QCad and then just used a pic to make the center holes.
CD horn driver blank.jpg

Cutting out the holes for the driver baffle.
driver plate cutout.jpg
driver plate cutout 2.jpg
I know ... way too much extra work here, but i've gone the extra mile and am routering an 1/8th deep slot for the panels to fit into. No weight penalty and will make for a stronger cabinet. ( yes i made the appropriate panels 1/4 longer to accommodate )
test fit router top.jpg
Top router.jpg
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

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