New member/first BFhorn/Tuba45

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ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

New member/first BFhorn/Tuba45

#1 Post by ACUA »

Here goes...
I received my Lab12 driver today. The sub is beautiful. I purchased some lumber and will begin building some jigs and cutting fixtures tomorrow.
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Lab12
Lab12
Advanced Concepts Underground Audio

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

Re: New member/first BFhorn/Tuba45

#2 Post by Tom Smit »

Enjoy the build!
TomS

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

Re: New member/first BFhorn/Tuba45

#3 Post by Chris_Allen »

Just looking at that sub makes my back hurt.
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

jimbo7
Posts: 849
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: New member/first BFhorn/Tuba45

#4 Post by jimbo7 »

Chris_Allen wrote:Just looking at that sub makes my back hurt.
Hey now! Let them learn the hard way like we all have. Isn't that part of the reason we end up building more and more? :mrgreen:
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#5 Post by ACUA »

guide rail check, i have been using guide rails for years now always just clamped a straight edge to the work piece, it took a long time to properly align up the rail for a perfect cut, this way makes it so quick and easy. I have never used PL before, i have always used liquid nail or industrial wood glue, so far i like the way the PL seems to be working out, i made sure to pick up a large-ish supply of shop towels to protect my self.
Attachments
IMG_0743.JPG
Advanced Concepts Underground Audio

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

Re: New member/first BFhorn/Tuba45

#6 Post by Bruce Weldy »

ACUA wrote: i made sure to pick up a large-ish supply of shop towels to protect my self.
Use these.....

http://www.harborfreight.com/5-mil-nitr ... 68497.html

You'll learn how much PL to put down with minimal squeeze out and less mess as you go.

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."

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#7 Post by ACUA »

ripped the major sections at 23", cut and drew in rough layout,
Attachments
IMG_0747.JPG
IMG_0748.JPG
Advanced Concepts Underground Audio

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

Re: New member/first BFhorn/Tuba45

#8 Post by CoronaOperator »

ACUA wrote: so far i like the way the PL seems to be working out, i made sure to pick up a large-ish supply of shop towels to protect my self.
The trick to a nice PL joint is to not smear it around or wipe it with a towel. Do a glue up and then let the squeeze out be. In about 4-5 hours, depending on your temp and humidity, come back and the PL should be mostly set-up but still soft enough to scrape away with a 2" putty knife or other flexible blade. If you get your timing on the set-up time just right you can make a nice clean joint; scrape too soon and it still smears around, wait too long and scraping it is like chipping concrete. Here is a before and after photo:

Image
Image

+1 to the blue gloves, wear them religiously even after you are done gluing up, your hands will find the wet glue no matter how careful you are. If you don't, your hands will look like this for a week:
Image

Couple other tips: after you lay the bead, release the pressure on the gun by pressing the catch with your thumb and lay the nozzle on a piece of cardboard or scrap wood as some PL will squeeze out the nozzle.
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

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#9 Post by ACUA »

i must admit that i have some reservations about using basic 5-ply 15/32" plywood, i always used heavy MDF 3/4" for its density which helped against sounding tinny... i am using a 1/4" round over for the internal edges, it tends to give me piece of mind concerning potential turbulence. i made some assembly jigs and located some wax paper, I installed the first panel of the enclosure. I drilled a hole in the section of the side panel that becomes the window, i am adamant about using a flush trim router to cut the windows out of the sides after the main internal walls for the driver chamber are secured. I will be making new doors to seal the driver chamber. i cant follow the plans exactly :noob:
Attachments
IMG_0755.JPG
IMG_0754.JPG
IMG_0752.JPG
IMG_0756.JPG
Advanced Concepts Underground Audio

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

Re: New member/first BFhorn/Tuba45

#10 Post by CoronaOperator »

ACUA wrote:i must admit that i have some reservations about using basic 5-ply 15/32" plywood, i always used heavy MDF 3/4" for its density which helped against sounding tinny... i am using a 1/4" round over for the internal edges, it tends to give me piece of mind concerning potential turbulence.
The braces are what make the cabinet rigid. Make sure you use the recommended amount. While the roundover doesn't hurt anything, it doesn't have any benefit either. In a port, the high air velocities can make turbulence, but in a horn there is no airflow. It is a pressure wave that propagates through the horn, the air more or less stays still.
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

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#11 Post by ACUA »

sets jigs and installed second panel, cut panel 3 and poked a hole for the drivers to breath through, made a router jig to poke the right size hole!!!!
Attachments
IMG_0758.JPG
IMG_0760.JPG
IMG_0759.JPG
Advanced Concepts Underground Audio

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#12 Post by ACUA »

at first i thought hey i will use this ring as a template for my driver cut out. i will be clever and secure it like this, :noob: then when i was cutting it went bbbbbvvvvvttttt :wall: so i made a proper router jig and got back to business... :cowboy:
Attachments
IMG_0757.JPG
IMG_0761.JPG
Advanced Concepts Underground Audio

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Bill Fitzmaurice
Site Admin
Posts: 28620
Joined: Tue May 02, 2006 5:59 pm

Re: New member/first BFhorn/Tuba45

#13 Post by Bill Fitzmaurice »

ACUA wrote: i am using a 1/4" round over for the internal edges, it tends to give me piece of mind concerning potential turbulence.
That will have absolutely no effect below roughly 10kHz.
i cant follow the plans exactly
Then you might as well not bother building it at all. :cop:

ACUA
Posts: 552
Joined: Sun Sep 25, 2016 6:21 pm
Location: Tucson Arizona

Re: New member/first BFhorn/Tuba45

#14 Post by ACUA »

I am not having the luck i was hoping too with this PL. seems to take forever to set up. I made a 90degree jig and used PL to join the two pieces and three days later as i was pulling the jig off the work piece the glued joint came apart. the PL looked like puddy on the inside like it had not fully cured. i have never had to wait that long with wood glue or liquid nail, i have had great luck with liquid nail for projects similar to this one have any of you tried it? the wax paper does not pull off of the PL very well. it will take some tinkering to get what i want out of it.

well third panel on and curing. i have my reservations about the PL or my ability to use it properly!!!!
Attachments
IMG_0762.JPG
Advanced Concepts Underground Audio

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

Re: New member/first BFhorn/Tuba45

#15 Post by Bruce Weldy »

Post a picture of the PL that you are using.......what you are describing is not at all the way it is supposed to cure. Joints are rockhard if left overnight. Plus, you should be using fasteners to hold the panels in place while the glue cures.

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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