2 x 36" THT LP with front firing mouth

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Grant Bunter
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Re: 2 x 36" THT LP with front firing mouth

#31 Post by Grant Bunter »

MA043HA wrote:
whines wrote:I've done it both ways, never going back to T-nuts.
that's great. The voice of experience! Care to explain why? Advantages/disadvantages when it comes to ease of installation? Does the non-Tnut method have a tendency to strip the screws in the wood with repeated installations? If not, why not?

I just noted that the older plans for the THTLP do call for T-nuts. Why the change?
Once you have slap tested, all things being equal, you are going to only have to drive screws one more time! ie install the driver at build finish.
If you insert the screws by hand initially, they will find their own way into the threads that have been created by previous insertion.

Tnuts can be a total PITA. They require precise placement, and careful alignment before you wind the bolts into them. Unless you use a method to ensure it doesn't happen (eg a small screw in one of the Tnut "flanges"), even with epoxy, they can come loose and spin, making it almost impossible, or at least very difficult, to remove the bolt without some sort of damage to either the driver or the cab.

Lots of people perceive an issue using screws, and that issue is one of their ability to hold the driver.
Needless to say, if this was an actual issue, it would not be a method in the plans...
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...

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

Re: 2 x 36" THT LP with front firing mouth

#32 Post by Tom Smit »

MA043HA wrote:
whines wrote:I've done it both ways, never going back to T-nuts.
that's great. The voice of experience! Care to explain why? Advantages/disadvantages when it comes to ease of installation? Does the non-Tnut method have a tendency to strip the screws in the wood with repeated installations? If not, why not?

I just noted that the older plans for the THTLP do call for T-nuts. Why the change?
Besides what Grant said about T-nuts, it has been experienced by some that there are air leaks through the threads of the machine screw. Another thing is that many have ended up with epoxy or PL in the threads, and that bunged up the situation.

After the screws have been installed into wood, and then removed, it is easy for the screw to find it's own thread again. Just put the screw into the hole lightly, rotate the screw counter-clockwise until you can feel it drop into the thread after which you turn the screw clockwise finger tight. Do this with all the screws until they are all started, and then use a driver to finish installing. one has to use light pressure or one will not feel the screw drop into the previously made thread.

If, for some reason, the threads get stripped out, it is easy to repair just by installing a dowel-like piece of wood and then redrilling once the glue is dry.
TomS

MA043HA
Posts: 60
Joined: Mon Jul 11, 2016 11:17 am
Location: Mass

Re: 2 x 36" THT LP with front firing mouth

#33 Post by MA043HA »

Grant Bunter wrote:
MA043HA wrote:
whines wrote:I've done it both ways, never going back to T-nuts.
that's great. The voice of experience! Care to explain why? Advantages/disadvantages when it comes to ease of installation? Does the non-Tnut method have a tendency to strip the screws in the wood with repeated installations? If not, why not?

I just noted that the older plans for the THTLP do call for T-nuts. Why the change?
Once you have slap tested, all things being equal, you are going to only have to drive screws one more time! ie install the driver at build finish.
If you insert the screws by hand initially, they will find their own way into the threads that have been created by previous insertion.

Tnuts can be a total PITA. They require precise placement, and careful alignment before you wind the bolts into them. Unless you use a method to ensure it doesn't happen (eg a small screw in one of the Tnut "flanges"), even with epoxy, they can come loose and spin, making it almost impossible, or at least very difficult, to remove the bolt without some sort of damage to either the driver or the cab.

Lots of people perceive an issue using screws, and that issue is one of their ability to hold the driver.
Needless to say, if this was an actual issue, it would not be a method in the plans...
Thanks Grant!

MA043HA
Posts: 60
Joined: Mon Jul 11, 2016 11:17 am
Location: Mass

Re: 2 x 36" THT LP with front firing mouth

#34 Post by MA043HA »

Tom Smit wrote:
MA043HA wrote:
whines wrote:I've done it both ways, never going back to T-nuts.
that's great. The voice of experience! Care to explain why? Advantages/disadvantages when it comes to ease of installation? Does the non-Tnut method have a tendency to strip the screws in the wood with repeated installations? If not, why not?

I just noted that the older plans for the THTLP do call for T-nuts. Why the change?
Besides what Grant said about T-nuts, it has been experienced by some that there are air leaks through the threads of the machine screw. Another thing is that many have ended up with epoxy or PL in the threads, and that bunged up the situation.

After the screws have been installed into wood, and then removed, it is easy for the screw to find it's own thread again. Just put the screw into the hole lightly, rotate the screw counter-clockwise until you can feel it drop into the thread after which you turn the screw clockwise finger tight. Do this with all the screws until they are all started, and then use a driver to finish installing. one has to use light pressure or one will not feel the screw drop into the previously made thread.

If, for some reason, the threads get stripped out, it is easy to repair just by installing a dowel-like piece of wood and then redrilling once the glue is dry.
Thanks Tom and Grant! Nothing like a thorough explanation. I think I'm going to like this forum.

zpro
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Location: Québec, Canada

Re: 2 x 36" THT LP with front firing mouth

#35 Post by zpro »

Still looking for an answer to this question if anyone can help me out:

Is the Behringer Nu4-6000 well suited for 2x THTLP and 2x Floorstanding loudspeakers (Statements II, Jim Holtz)

(One loudspeaker on each of four channels)

Thanks! :hyper:

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Bill Fitzmaurice
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Re: 2 x 36" THT LP with front firing mouth

#36 Post by Bill Fitzmaurice »

zpro wrote:Still looking for an answer to this question if anyone can help me out:
Is the Behringer Nu4-6000 well suited for 2x THTLP and 2x Floorstanding loudspeakers (Statements II, Jim Holtz)
Try here:
http://billfitzmaurice.info/forum/viewforum.php?f=6

CoronaOperator
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Re: 2 x 36" THT LP with front firing mouth

#37 Post by CoronaOperator »

One of the issues with pro amps in the home environment is the fan noise and the inuke's are particularly loud. You can google inuke fan replacement mod to install a quieter fan but you will still want it in a case or another room as the fan noise is annoying during quiet movie passages.
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

zpro
Posts: 49
Joined: Tue Jun 14, 2016 6:23 am
Location: Québec, Canada

Re: 2 x 36" THT LP with front firing mouth

#38 Post by zpro »

Ok thanks for the info, I will look into other options.

If anyone has suggestions I am all ears...

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whines
Posts: 251
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Location: Austin, Texas

Re: 2 x 36" THT LP with front firing mouth

#39 Post by whines »

There are amps that don't have fans, like the A500:

http://www.bhphotovideo.com/c/product/3 ... mount.html

Not a specific recommendation, I haven't used one myself, but others have. It's probably plenty powerful enough.
2xJ15, THT, 4xT39 3012 (2x15", 2x20"), 2xSLA Pro, 2x short SLA Pro (Dayton), W6

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Bill Fitzmaurice
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Re: 2 x 36" THT LP with front firing mouth

#40 Post by Bill Fitzmaurice »

I drive my mains and surrounds with an AVR, my TT with a 100w plate amp mounted in it's own box.

zpro
Posts: 49
Joined: Tue Jun 14, 2016 6:23 am
Location: Québec, Canada

Re: 2 x 36" THT LP with front firing mouth

#41 Post by zpro »

One more question:

Planning on working on the finish for the THT this weekend... I was wondering what I should fill the screw holes with?

I am not planning on painting it, so perhaps something that will somewhat match the color of the wood?

I am planning on staining them or simply varnishing.

I know that I could use PL, but it is grey...

Thanks. :)

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whines
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Joined: Wed Apr 24, 2013 12:43 pm
Location: Austin, Texas

Re: 2 x 36" THT LP with front firing mouth

#42 Post by whines »

Stainable wood filler?
2xJ15, THT, 4xT39 3012 (2x15", 2x20"), 2xSLA Pro, 2x short SLA Pro (Dayton), W6

zpro
Posts: 49
Joined: Tue Jun 14, 2016 6:23 am
Location: Québec, Canada

Re: 2 x 36" THT LP with front firing mouth

#43 Post by zpro »

Ok thanks!

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