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Dave's THT Build Thread

post #1 of 36
Thread Starter 
Started work on my THT today.

Cut out 6 panels.

Can't wait to have it ready!
post #2 of 36
i'll be following your build. since you have both home audio and pro audio subs of great quality, i look forward to your impression on how the tht compares.
post #3 of 36
Thread Starter 
Quote:
Originally Posted by LTD02 View Post

i'll be following your build. since you have both home audio and pro audio subs of great quality, i look forward to your impression on how the tht compares.

I will try do a proper comparison between all 3 of them with graphs. I also want to see how they all work together as one, because the SVS has a great low end response from about 14hz and up and my eighteen sound pro sub is dynamite above 30hz but maby the THT will have the best of both with even greater efficiency!

I am also building the standard 24.5" version due to size constraints.
post #4 of 36
cool.
post #5 of 36
Sweet! How wide are you going?


dbl
post #6 of 36
he said 24.5" wide. I have one it replaced 7 subs
post #7 of 36
Thread Starter 
Quote:
Originally Posted by snickel View Post

he said 24.5" wide. I have one it replaced 7 subs

Thats amazing. What kind of subs?

Got 3 panels left to cut and a few more braces.

Already installed panels 1 and 2 waiting on the woofer so I can cutout the hole and install the rest.

This might get voted the ugliest THT on the insides. I am using black PL type glue (sikaflex 11-FC) and its a damn mess but its doing its job. Worse thing is I can't get it off my hands.
post #8 of 36
Quote:
Originally Posted by DL86 View Post

Thats amazing. What kind of subs?

Got 3 panels left to cut and a few more braces.

Already installed panels 1 and 2 waiting on the woofer so I can cutout the hole and install the rest.

This might get voted the ugliest THT on the insides. I am using black PL type glue (sikaflex 11-FC) and its a damn mess but its doing its job. Worse thing is I can't get it off my hands.

And then god created gloves...
post #9 of 36
Quote:
Originally Posted by DL86 View Post

Thats amazing. What kind of subs?

Got 3 panels left to cut and a few more braces.

Already installed panels 1 and 2 waiting on the woofer so I can cutout the hole and install the rest.

This might get voted the ugliest THT on the insides. I am using black PL type glue (sikaflex 11-FC) and its a damn mess but its doing its job. Worse thing is I can't get it off my hands.

It takes about a week to come off. Until then you'll look like you have Leprosy.
post #10 of 36
Thread Starter 
Done. Cut all the panels, reflectors braces etc... in 2 days with a circular saw using a guide and both free hand cutting. Accurate to +/- 1/16" most are very close to exact although some a very slightly off.

Driver will be in Thursday just need to cut the hole when it gets in should have it up and running by the weekend if all goes to plan and wow plywood is so much better on the nose than MDF. I probably would have been in hospital if this design called for MDF.

Will apply finishing to the sub next month or so as soon as I get some rockard paint in (like duratex).
post #11 of 36
Thread Starter 
Alrighty time for some pics

First cut


Panel 1 installed


Helping hand


Dayton woofer arrives


A new woofer joins the family


Testing driver fit on panel 3 cutout






Current stage


All panels are lining up quite nicely some quirks along the way but nothing that couldnt be fixed and yes that black PL glue is nasty as you can see.

Measurements seem to be quite good. I did have to trim back some panels because I didn't do the angled cuts.

Also learned to work with inch's building this project!
post #12 of 36
Nice going...what kind of adhesive are you using?
post #13 of 36
Thread Starter 
Sikaflex 11-fc
post #14 of 36
Quote:


Sikaflex-11 FC is a one-component, gun-grade, adhesive and sealing compound of permanent elasticity

I don't know if one wants the 'permanent elasticity' part when building this THT.

I will let others chip in..

Use a lot of screws...
post #15 of 36
Thread Starter 
The plans ask for a polyurethane construction adhesive. Isn't that what this is? Its the closest stuff I could find description wise to the PL stuff.

It is extremely strong though. Its not very flexible a bit like a tough rubber.
post #16 of 36
It doesn't look like it expands like PL does. That is something you really want so that all the gaps are filled and sealed.
post #17 of 36
Quote:
Originally Posted by snickel View Post

he said 24.5" wide. I have one it replaced 7 subs

seven drivers 5 subs. 2 ported subs with dual EHQS 12" drivers, a sealed 15" tempest x sub, a sealed shiva 12" and a 18" Ed sub with pro amp and EQ. I didn't want to give up my big wall of subs but the THT sounds as good and takes up less room
post #18 of 36
Thread Starter 


Ok just have the access panel to install and shes all ready.
post #19 of 36
Very interested to hear what you have to say about it....

JSS
post #20 of 36
Quote:
Originally Posted by AndreasMergner View Post

It doesn't look like it expands like PL does. That is something you really want so that all the gaps are filled and sealed.

It looks like it is expanding or he has placed so much on there that it covers both sides.
post #21 of 36
Thread Starter 
All up I used 3 standard tubes of it. Very high quality stuff, 16 bucks a tube. I highly doubt any air will leak out.

Just installed the access panel retention peices waiting to dry and installed the speaker terminal plate on the access panel.
post #22 of 36
This stuff is very close to PL Premium for anybody in Australia.http://www.selleys.com.au/Selleys-Li...m/default.aspx
post #23 of 36
i'm waiting with you dl86, and from the other side of the planet! something about that is pretty cool.
post #24 of 36
I'm sure the glue will be fine too. For some reason, I thought he hadn't started using it yet...even though he had posted pics. I try not to be one of those people with all of the advice *after* the project is done.

I have a THT on my to do list, so every new build is fun to watch.
post #25 of 36
The first thing I thought it was when I saw it was the black acoustical sealant we use with vabor barriers.. Stuff never truely dries and remains flexible.. Hope the stuff you used isn't the same thing


heres what I was using

http://www.soundproofcow.com/images/D/d_17225.jpg


But good build so far
post #26 of 36
Thread Starter 
Thanks.

No that is not similar to the stuff im using.

The one I am using is rated as a polyurethane construction adhesive which is specified in the plans.

It is both a sealent and adhesive rated with a very high adhesive strength. I can agree with the high strength I can pick up the box with one brace which I only glued on without any complaints from the joint.
post #27 of 36
Thread Starter 
Got her fired up.

Had a few air leaks around the woofer and at the access panel which I had to bend over backwards to fix.

I really like what I hear. I have the SVS on top of the THT haven't connected the 21" yet. Bit of tinkering getting the response reasonably flat, the THT starts to cut off at 21hz in my room and the svs about 15hz. They augment each other quite nicely I get a flat response down to 16hz and starts to fall off after that.

Very clean sound, better than my 21" imo even my freind noticed. Its hard to describe. Running off one channel from my behringer ep4000, I managed to clip it but it was louder(and cleaner) than what I acheived before.

Response from the mouth is essentially whats on BFM's website for the tuba HT for the 24 inch wide version.

Kudos to BFM.
post #28 of 36
Thread Starter 
Deleted.
post #29 of 36
Thread Starter 
Introduced my 21" back into the equation and the overall result is even better! I get a more even sound throughout the room.

Playing metallica st anger at 120dbc from anywhere in the room is unreal. Some real chest compression SPL levels happening now, which is what I am after.

All I can say is mixing the THT and direct radiator subs works well (in my case anyway)... better response than just having the THT on its own.

Will take photos after I paint the THT.
post #30 of 36
So does the 21" take over at the lower frequencies then with the THT? Almost all comments I have read say don't mix and match different sub designs but from the people that actually use them seem to like what they get.
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