Another T39 build

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ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Another T39 build

#1 Post by ctmullins »

Okay, it's official!

As discussed in my inquiry thread, today I started work on my BFM PA. I'm strongly leaning towards Otop12s for the tops, but not completely sure yet. So I figured the subs would be a good place to start!

Not much to show, but it is proof that the build is underway - panels cut to rough dimensions! After dinner I'll sharpen my pencil and begin marking the sides. Doubt I'll glue anything up tonight, and tomorrow it's back to the day job. :chainsaw:

Image
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

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J_Dunavin
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Joined: Sun Jul 09, 2006 3:13 pm
Location: Appleton WI
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Re: Another T39 build

#2 Post by J_Dunavin »

Good start!
Keep plugging away, just a little bit every night, it'll be done before ya know it.
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#3 Post by ctmullins »

Thanks for the encouragement, J, but wow, what a hella busy and exhausting work week I had! :wall:

Had a little bit of time on Saturday though. Got the top (panel 1) and the baffle (panel 2) cut out to spec. My router slipped a bit when making one of the hand holds; will have to figure out how to fix that. :chainsaw:

Image

Then, after that amazing amount of progress, last night I re-read the text describing how to do the baffle and the driver anchor, and after consulting SketchUp, realized that I had it all completely wrong. :chainsaw: I didn't realize that the driver is actually inlaid into the baffle, and screwed only to the anchor behind it. So today started with me trying to fix that with my little laminate router.

Image

Tedious and time-consuming, but it worked.

Dry fit everything and checked for square, pretty good so far, but we're just getting started.... Then made a mess with PL. :evil:

Image
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That's all for this weekend, and next week promises to be hellaciously busy at the day job again.....
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#4 Post by ctmullins »

Panels 3 and 4 fitted this evening! Numerous little scrap jigs and clamps used to hold the panels while the PL sets. I actually added a couple more after this shot was taken:

Image

I love this little spreader clamp!

Image
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

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Tom Smit
Posts: 7457
Joined: Sat Jan 05, 2008 1:24 pm
Location: Sarnia, Ont. Canada

Re: Another T39 build

#5 Post by Tom Smit »

I love this little spreader clamp!
Yup, they are handy, aren't they?
TomS

CoronaOperator
Posts: 1648
Joined: Wed Mar 25, 2009 7:07 pm
Location: Medicine Hat, Alberta, Canada

Re: Another T39 build

#6 Post by CoronaOperator »

ctmullins wrote:Panels 3 and 4 fitted this evening! Numerous little scrap jigs and clamps used to hold the panels while the PL sets. I actually added a couple more after this shot was taken:
That looks about the same number of scrap jigs as when I built my subs. I see insulation, are you in an attic :shock: ? You are only supposed to build your tops in the attic, subs are supposed to be built in the basement :wink: !
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#7 Post by ctmullins »

CoronaOperator wrote: That looks about the same number of scrap jigs as when I built my subs. I see insulation, are you in an attic :shock: ? You are only supposed to build your tops in the attic, subs are supposed to be built in the basement :wink: !
Ha ha! Yep, our house has a barn roof, so the attic is massive! It's currently unfinished, but I have a drill press, a small table saw, and a drafting table/workbench up there, as well as good lighting that I installed, so it works well. Of course, it's only usable during half the year, as our brutal six-month summers here mean 120+ temps up there. No basements in the Gulf South, they'd just be full of swamp water anyway.

I'm building 24" T39s, so they should fit through the door after they're built. :fingers:

Ordered 3012LFs, casters, and skid rails from Leland this morning! :hyper:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

Grant Bunter
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Re: Another T39 build

#8 Post by Grant Bunter »

ctmullins wrote:
I'm building 24" T39s, so they should fit through the door after they're built. :fingers:
Don't forget they are only 19 1/2" deep.
Turn em sideways to get them through doors if needed...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#9 Post by ctmullins »

Panels 5 and 6, and their associated braces, fitted today! I swiss-cheesed the braces, not that it helps much, but the drill press was sitting right there...

Image

I must not have understood the plans regarding panel 6. The measured length shows as 17 3/8", but the required length, when I went to test-fit, was 16 3/4". :confused: :confused: :confused: I double-checked Sketchup, cut it down to 16 3/4", and glued it in.

The panel 6 extension is not glued in yet, although it appears in the photo, astride the driver chamber...

How many more cabs will I need to build before I don't make a complete mess with the PL? :wall: :lol:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

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LelandCrooks
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Location: Midwest/Kansas/Speaker Nirvana
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Re: Another T39 build

#10 Post by LelandCrooks »

ctmullins wrote: How many more cabs will I need to build before I don't make a complete mess with the PL? :wall: :lol:

Many. 8)
If it's too loud, you're even older than me! Like me.
http://www.speakerhardware.com

ripNdeb
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Location: Eureka, CA
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Re: Another T39 build

#11 Post by ripNdeb »

So true. That 'mess' is a part of the no-air-leaks solution.
2X OTop 112, 3012HO, melded - 2X T39, 27", Lab 12 - XF 212 - 4 DR250, 2 melded, 2 straight
2 20" T39 3012LF - WH10 - WH8 - in the shop - 2 more 20" T39s
http://saltandlighteureka.org still need a trailer :)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#12 Post by ctmullins »

Baby steps...

Here's the collection of clamps and guideboards necessary to keep the panel 6 extension in place while the PL sets. I had hoped to do the flanges as well, but there's no way to do that until the panel 6 extension is fully glued in...

Image

My fabulous spreader clamp makes another appearance! :hyper:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#13 Post by ctmullins »

Slowly getting the "fiddly bits" (access panel flanges and associated tiny little braces) done...

Image
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#14 Post by ctmullins »

Installed panels 7 tonight. I'm not real happy with them, as I slightly dislodged one of my vertical flanges while trying to nail one of the panels 7 to it. :cussing: I clamp-partied it all back into alignment well enough, but I'm going to have to go back in and check it after the PL cures, and maybe reapply some PL to it.

I'm considering consolidating a few of these smaller pieces into some larger ones for the companion T39. Might be a bit more wasteful, but hopefully not much.

No pics 'cause I'm grumpy. :cussing:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#15 Post by ctmullins »

Well, the panels 7 and the flanges seem to be okay. I'll probably go over them with another bead of PL just to make sure they're sealed.

Fitted panel 8 (the back) and associated braces today. This is a big panel, and it was warped, which necessitated clamping on a large, long caul of rock maple, leftover from one of my bass builds. Came out nice and square though! Swiss-cheesed the braces again, just 'cause.

I was a little surprised to discover that my panel 8 is a half-inch too long! Double-checked the plans, and the Sketchup, and yep, panel 8 is cut to 39" early on, but measures out at 38.5" in Sketchup, so I guess I was supposed to trim it down. I didn't. I'll do it later. :noob:

Image
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

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