36" THT Low Profile, Warning lots of coffin pictures
36" THT Low Profile, Warning lots of coffin pictures
I am building a THT low profile, i will replace my two diy peerless xls 10" subs, hoping to get better low frequency impacts for movies. They say bigger is better... right? so decided to build the 36" version.
I´m halfway through the build.
Couldn´t find the PL glue here in europe but i found on the forum that someone recomended the Everbuild Lumberjack 30min Wood Adhesive gel. It´s a Polyurethane gel glue and it seems to work well.
I´m halfway through the build.
Couldn´t find the PL glue here in europe but i found on the forum that someone recomended the Everbuild Lumberjack 30min Wood Adhesive gel. It´s a Polyurethane gel glue and it seems to work well.
Last edited by El dillo on Thu Nov 05, 2015 12:02 pm, edited 1 time in total.
Re: 36" THT Low Profile, Warning lots of pictures
First i got confused about how many bracers to use with this width, the plans says 3 sets wider than 25". But more rigid is better so i used 4, have anybody had any problems with panels resonating?
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- Location: Ilfracombe Queensland Australia
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Re: 36" THT Low Profile, Warning lots of pictures
Looking great so far
To many braces is way better than not enough!
Panel resonance is not always detectable, and it can account for a loss in output of around 3dB...
To many braces is way better than not enough!
Panel resonance is not always detectable, and it can account for a loss in output of around 3dB...
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...
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...
Re: 36" THT Low Profile, Warning lots of pictures
Ok good to know , i was more worried about unwanted noise.
I think im going to try a different design for the cover...
Maybe laminate ply and mdf (and braced), I also want to use T-nuts and countersunk holes for screws.
I think im going to try a different design for the cover...
Maybe laminate ply and mdf (and braced), I also want to use T-nuts and countersunk holes for screws.
Re: 36" THT Low Profile, Warning lots of pictures
How much could the internal volume of the closed chamber vary from the original design (36") without affect the sound for the worse?
Re: 36" THT Low Profile, Warning lots of pictures
Stay away from MDF. It doesn't have enough rigidity for these applications.
Good food, good people, good times.
4 - AT
1 - TT
1 - THT Slim
2 - SLA Pro 4x6 Alphalite
4 - AT
1 - TT
1 - THT Slim
2 - SLA Pro 4x6 Alphalite
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- Posts: 6915
- Joined: Mon Nov 28, 2011 11:12 am
- Location: Ilfracombe Queensland Australia
- Contact:
Re: 36" THT Low Profile, Warning lots of pictures
It shouldn't vary at all, other than the tolerance of panels making it 1/16" to 1/8" out.How much could the internal volume of the closed chamber vary from the original design (36") without affect the sound for the worse?
Stick to the plans.
The chamber size in the plans is the size the chamber needs to be...
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...
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...
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- Posts: 136
- Joined: Tue Apr 15, 2014 8:24 am
Re: 36" THT Low Profile, Warning lots of pictures
That is going to be heavvvy
What driver are you using? What are you going to use for an amp?
What driver are you using? What are you going to use for an amp?
16.5" AT w/ Infinity 860w
TLAHs w/ 9 mids & 16 tweets
17" THTLP w/ Dayton RSS315HF-4
16" TAT w/ Infinity 1060w
18" TT w/ Dayton DCS-205-4
5.5" TrT w/ DCS-205-4
T-18 w/ DCS-205-4
33" THT w/ Dayton Titantic 1200
DR200s
TLAHs w/ 9 mids & 16 tweets
17" THTLP w/ Dayton RSS315HF-4
16" TAT w/ Infinity 1060w
18" TT w/ Dayton DCS-205-4
5.5" TrT w/ DCS-205-4
T-18 w/ DCS-205-4
33" THT w/ Dayton Titantic 1200
DR200s
Re: 36" THT Low Profile, Warning lots of pictures
Ok, it just seems like the cover in a 36" needs more stabaility, Bracing it may be enough then.It shouldn't vary at all, other than the tolerance of panels making it 1/16" to 1/8" out.
Stick to the plans.
That is going to be heavvvy
What driver are you using? What are you going to use for an amp?
I surely hope it will not exceed the wheight of my old concrete sub enclosures (80kg) i almost broke my back everytime i had to move them.
I think a sack trolley will do the job.
i will use the Dayton Audio RSS390HF-4 driver with an extra gasket connected to one channel from a stereo amp (upgrade comes later) and the crossover is in the AV- reciever.
Re: 36" THT Low Profile, Warning lots of pictures
6/2 bracers
I was thinking it needed the airflow so i made all of the panel 6/2 bracers with an cutout (for the driver), the bracers that are not oppsite the driver should these be without?
I was thinking it needed the airflow so i made all of the panel 6/2 bracers with an cutout (for the driver), the bracers that are not oppsite the driver should these be without?
Re: 36" THT Low Profile, Warning lots of pictures
You can leave those 6/2 braces as is because it does not matter. The only reason for the notches is so that the driver will not contact the braces.
TomS
Re: 36" THT Low Profile, Warning lots of pictures
Test fitting the other side panel...
Some misalignment to fix
I also had to do some planing and grinding on the width panels because of height differences.
It was all cut at the workshop
Some misalignment to fix
I also had to do some planing and grinding on the width panels because of height differences.
It was all cut at the workshop
Re: 36" THT Low Profile, Warning lots of pictures
Some Plastic Padding will fix it.
The other panels was almost perfect, but some had to be re drilled.
Bought 4 tubes of glue, almost 2 full that would be enough for the rest.
The other panels was almost perfect, but some had to be re drilled.
Bought 4 tubes of glue, almost 2 full that would be enough for the rest.
Re: 36" THT Low Profile, Warning lots of pictures
haven´t found any leaks so far...
Hope this will work
Made the lid larger, i will do some routing later when the lid is in place to get exact fit.
I wonder if the connection panel need to be sealed with silicone or if it will be airtight just with a rubber seal.
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- Joined: Tue Apr 15, 2014 8:24 am
Re: 36" THT Low Profile, Warning lots of pictures
I would add some braces perpendicular and in between those lid braces that would stiffen it up along the other axis. While those braces stiffened up the lid in the short direction, in the long direction you could get flex. If the final placement of the speaker will put the access panel in contact with the ground with the speaker throat pointing up, the extra bracing wouldn't be needed. The only way it could flex would be to lift up that 200 lb speaker
Follow the leakage test in the plans. It is easy to hear air leaks in the access panel with a hose to your ear. You can always use the rubber seal, test it, if it leaks seal the entire perimeter gap of the access with clear latex caulk. It goes on as white, and dries clear. It is paintable, water clean up, and easy to cut cleanly if you ever need the access panel off again. Silicon, makes a mess and isn't paintable. It is hard to cut cleanly, it wants to tear.I wonder if the connection panel need to be sealed with silicone or if it will be airtight just with a rubber seal.
16.5" AT w/ Infinity 860w
TLAHs w/ 9 mids & 16 tweets
17" THTLP w/ Dayton RSS315HF-4
16" TAT w/ Infinity 1060w
18" TT w/ Dayton DCS-205-4
5.5" TrT w/ DCS-205-4
T-18 w/ DCS-205-4
33" THT w/ Dayton Titantic 1200
DR200s
TLAHs w/ 9 mids & 16 tweets
17" THTLP w/ Dayton RSS315HF-4
16" TAT w/ Infinity 1060w
18" TT w/ Dayton DCS-205-4
5.5" TrT w/ DCS-205-4
T-18 w/ DCS-205-4
33" THT w/ Dayton Titantic 1200
DR200s