Slim THTLP

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JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Slim THTLP

#1 Post by JensToft91 »

Hi all.

The project is a go.

I got my wood sawed by the store - as I thought they could make the cut more precise than myself. Well. Lesson learned. Don't do that.

It's not too bad though, and I believe I can fix the minor issues as I go along.

My biggest problem is, the main plate, where everything attaches to, decided to bend backwards. As far as I can see, there's only two parts that straighten the sides - and they are both in the same end.

Any tips?

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#2 Post by JensToft91 »

I used a piece of scrap wood, and straightened it out. I placed it in the horn-mouth, so I can remove it when it's finished.

DaveMacKay
Posts: 88
Joined: Tue Aug 03, 2021 3:10 pm

Re: Slim THTLP

#3 Post by DaveMacKay »

It depends on how bad the warping is.
  • If the warping is relatively minor, I think that the approach you've taken will likely be OK. Also, adding the panels and other side will help to force the side into shape.
  • However, if the warping is extreme, you may want to discard that piece and cut a new one. I understand that you're looking to keep the cost of the build down, but buying a new sheet of plywood will be less costly than ending up with a bad subwoofer and having to redo it.

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Seth
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Re: Slim THTLP

#4 Post by Seth »

JensToft91 wrote: Wed Jan 12, 2022 12:03 pm Hi all.

The project is a go.

I got my wood sawed by the store - as I thought they could make the cut more precise than myself. Well. Lesson learned. Don't do that.

It's not too bad though, and I believe I can fix the minor issues as I go along.

My biggest problem is, the main plate, where everything attaches to, decided to bend backwards. As far as I can see, there's only two parts that straighten the sides - and they are both in the same end.

Any tips?
Awesome Jens! I didn't expect it to begin so soon. Good for you :thumbsup:

My experience with having the lumber yard cut down sheets is; the equipment is great and very capable of doing a really good job. But, the blade is nearly always dull and the employee making the cuts thinks ½" off is close enough.

Follow the plans instructions for dealing with warpage. As it comes together, it'll straighten out. Honestly, I'd rather have a warp in the sides than in the panels.
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

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#5 Post by JensToft91 »

The support I made is working pretty well. I'll post a picture of it when I get home.
I was very clear about the precision at the lumber yard - it was the saw. Most of it is the same width - but some of the boards is narrower towards the end. Like the sheets tilts when the saw approaches the end. Plus, the cuts themselfs are very slightly curved - so the board have the same width thoughout - but is curved "lengthwise". But I believe it's doable.

Couple of pics of the curve attached.

Driver for scale (another 12 inch)
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DaveMacKay
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Joined: Tue Aug 03, 2021 3:10 pm

Re: Slim THTLP

#6 Post by DaveMacKay »

I think you'll be fine.

Good luck with the build.

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Chris_Allen
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Re: Slim THTLP

#7 Post by Chris_Allen »

When you secure the side, you should be able to pull that curve out as long as you secure with screws. If you use a nailer, you might have a hard time getting air tight.

Be careful if you have to cut the curved sheets, it can cause chaos with an angled edge.
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#8 Post by JensToft91 »

It's starting to take shape! Panel 5 was a struggle. I ruined my saw-sled, because i forgot that the saw was set to a 7-deg angle from the previous cut.
The panel is not super straight - but I'm sure it's airtight. I don't think it will cause any problems :-)
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JensToft91
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Re: Slim THTLP

#9 Post by JensToft91 »

Chris_Allen wrote: Fri Jan 14, 2022 8:06 am When you secure the side, you should be able to pull that curve out as long as you secure with screws. If you use a nailer, you might have a hard time getting air tight.

Be careful if you have to cut the curved sheets, it can cause chaos with an angled edge.
I'm using all the screws i feel that's necessary.

How does the curved sheets affect the angled edge? I'm using a saw-sled- so the panel is always pressed flat during a cut. I can imagine the problem on a table-saw though :shock:

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#10 Post by JensToft91 »

Close-ups
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Seth
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Re: Slim THTLP

#11 Post by Seth »

Looking mighty fine Jens :thumbsup: You're nearly on the home stretch! Nice job.

I'm anxious to hear your report of how it compares to your TT.
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

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#12 Post by JensToft91 »

Thanks!

Me too. I'll post side/side measurements when it's completed 👍

I ran out of my PU glue, and went to buy a new one. This one expands a hell of a lot! Now I get why people say "I don't like PU. I makes me puke".

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#13 Post by JensToft91 »

The driver will arrive in march. So I need a bit of patience though. 🙄

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

Re: Slim THTLP

#14 Post by jimbo7 »

JensToft91 wrote: Mon Jan 17, 2022 12:11 amI ran out of my PU glue, and went to buy a new one. This one expands a hell of a lot! Now I get why people say "I don't like PU. I makes me puke".
What are you using? Most of us here us Loctite PL glue. It expands some but not anything like a foam does. The smell isn't anything noxious but it will ruin anything it touches.
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

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: Slim THTLP

#15 Post by JensToft91 »

It's Danish, so you probably can't look it up.

I have attached a picture of it, where you can see the new (Very foaming) glue line applied outside of the joint to seal it. You can also se a glueline of the old, less expanding glue.

Should I but something else?
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