...but he might be overbuilding them? I'm not sure I'm catching your drift.Rick Lee wrote:I can vouch for 1/4" T39s. Just finished up another pair about 3 days ago. You're definitely not underbuilding them...
T39L attempt
Re: T39L attempt
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!
Re: T39L attempt
Sorry, quick reply earlier. It looks really nice! I wouldn't say overkill but definitely more than adequate. I use fewer braces across that width and don't have any issues. However, it's been several years since I've built the old way so some of the way the OP is bracing won't work for the new way. Without the access panel on top I can brace the speaker chamber more "end to end". I also use 1/2" for the baffle. The other difference is if the cab is going to see lots of load ins and outs I reinforce the outside edges with fiberglass.
To me the "new" way is so much better. It's easier to build an airtight chamber since the only opening is where the speaker goes. Much easier to mount the driver. I'll also say that I did my own new way before the plans were changed and I like it better than what Bill came up with. Basically I make two panel sevens with the inside panel cut for the speaker to go through. That way the front panel can be reinforced with the cut piece and it stretches across the whole cab which looks much nicer than the "access panel look". Here's a picture that may give an idea of how I do the front panel.
The ONLY negative is that you need to build the cab up to a 1/2" deeper to give a "lip" for the extra panel.
To the OP- don't skimp on the bracing for the back panel. With the quality of the work you're doing I'm sure you won't but that's an area that can use overkill. I don't recommend the recessed jack with 1/4" cabs at least on the back panel because it creates too much noise. I had a "rattling" with a 1/4" T39 once and it ended up being turbulence around the jack plate. The only way I fixed it was by turning it upside down.
With all that said a 1/4" T39 works if you need light weight. It is very light- under 40lbs. However, the entire cab as a complete system still resonates more than the 1/2". Difference in dB is probably negligible but I'm sure there's at least some loss. Still amazing sound especially with it being so light!
To me the "new" way is so much better. It's easier to build an airtight chamber since the only opening is where the speaker goes. Much easier to mount the driver. I'll also say that I did my own new way before the plans were changed and I like it better than what Bill came up with. Basically I make two panel sevens with the inside panel cut for the speaker to go through. That way the front panel can be reinforced with the cut piece and it stretches across the whole cab which looks much nicer than the "access panel look". Here's a picture that may give an idea of how I do the front panel.
To the OP- don't skimp on the bracing for the back panel. With the quality of the work you're doing I'm sure you won't but that's an area that can use overkill. I don't recommend the recessed jack with 1/4" cabs at least on the back panel because it creates too much noise. I had a "rattling" with a 1/4" T39 once and it ended up being turbulence around the jack plate. The only way I fixed it was by turning it upside down.
Re: T39L attempt
Ooohh- can't wait to get started on one of these myself, using this:
http://www.aircraftspruce.com/catalog/w ... hbirch.php
http://www.aircraftspruce.com/catalog/w ... hbirch.php
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!
Re: T39L attempt
Those prices are STOOPID expensive.Rich4349 wrote:Ooohh- can't wait to get started on one of these myself, using this:
http://www.aircraftspruce.com/catalog/w ... hbirch.php
Contact:
Owl Hardwood Lumber Company
4655 SW Hwy
Oak Lawn, IL 60453
(708) 422-1300
owlhardwood.com
They are about an hour north of Kankakee.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
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FrankORandle
- Posts: 61
- Joined: Wed Mar 04, 2015 8:40 am
- Location: Peoria, Illinois, USA
- Contact:
Re: T39L attempt
Woodworkers ShopRich4349 wrote:Ooohh- can't wait to get started on one of these myself, using this:
http://www.aircraftspruce.com/catalog/w ... hbirch.php
13587 E. Manito Road
Pekin, IL 61554
800-475-9663
http://woodworkersshop.com/
Their BB prices for 60" x 60" sheets
1/8" - $15.67
1/4" - $23.81
1/2" - $36.10
3/4" - $58.36
2-TTLS w/Dayton RSS265HO-4 10" Reference HO Subwoofer
Re: T39L attempt
Thanks for the tips, guys. (I've gotten my bb from WWS in Pekin before- top notch materials.)
But I doubt they'll carry the 1/16, 3/32, or 1/32 for my T-39, helium edition.
But I doubt they'll carry the 1/16, 3/32, or 1/32 for my T-39, helium edition.
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!
Re: T39L attempt
12 ply 1/4"BB sounds pretty robust, but I think it's a little out of my price range. If you use the 12 ply stuff, be sure to take your cab to the FAA to see if they'll certify it.
I'm more of an under $25 per 5x5 sheet guy.
I'm more of an under $25 per 5x5 sheet guy.
Re: T39L attempt
I don't get the cost/benefit frankly. Yes they are lighter, but my T39s are already incredibly light for what I get out of them. I could not see going this route, especially after so many people have sat, stood or danced on my T39s. I hope it works out for your application though.
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Bruce Weldy
- Posts: 8318
- Joined: Fri Nov 27, 2009 11:37 am
- Location: New Braunfels, TX
Re: T39L attempt
dswpro wrote:I don't get the cost/benefit frankly. Yes they are lighter, but my T39s are already incredibly light for what I get out of them. I could not see going this route, especially after so many people have sat, stood or danced on my T39s. I hope it works out for your application though.
+1
Mines gots wheelses. I doesn't know what they weigh....and I doesn't care.
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."
Re: T39L attempt
Wheelses yes... my preciousss...
I agree that the 1/2" variety is the way to go. But the customer's always right!
I agree that the 1/2" variety is the way to go. But the customer's always right!
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Bruce Weldy
- Posts: 8318
- Joined: Fri Nov 27, 2009 11:37 am
- Location: New Braunfels, TX
Re: T39L attempt
Rick Lee wrote:Wheelses yes... my preciousss...
I agree that the 1/2" variety is the way to go. But the customer's always right!
Ha.....I'm glad I'm at the stage in my life where I get to pick my customers. And fire 'em if I want to.
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."
Re: T39L attempt
Got some more work done today. At this rate, I'll be done by Christmas.
Re: T39L attempt
Again, very nice work. It's starting to look very nautical in there!
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!
Re: T39L attempt
Just looking at the pictures, its hard to believe much weight would be saved. Must also take twice as long to build.
I appreciate the complexity and craftsmanship of it all, though.
I appreciate the complexity and craftsmanship of it all, though.