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Discussion Starter #1 (Edited)
I figured I'd start a new thread instead of mooching off of the other threads with my questions... I have started my build for the two Gjallarhorns designed by Ricci - thanks for sharing the plans Josh! I'm building these for my 2700 cu ft living room that we use for watching movies, listening to music, entertaining, etc. Not really a "true" HT because it's the main room of our house and there are several different openings to the room, two windows, sliding glass door, vaulted ceiling, fireplace. The goal is to have this room +10 on WAF by looking like a "normal room," but with ninja-stealth, bone crushing sound coming from the shadows.

I chose the G-horn because it's output of sheer terror down to 15hz, which is as low as I care about, below 15hz doesn't do anything for me. I like to turn it up to 11, and have a history of destroying my drivers because of my generosity toward the volume knob, but also because this living room is difficult to pressurize. These will be placed in the attic, behind the vaulted ceiling and firing through to the room from the front and rear left side corners. As soon as these are finished and tested, demo on the room begins for our remodel, subs get hoisted up to the attic for placement.

So far I have the sheets of BB cut according to the plans and the horn-path drafted to the side panels. Tomorrow I will begin with attaching the first couple of panels with PL, also using the Kreg system and screws.

Completed:
http://s20.photobucket.com/user/ocd_reef/media/IMG_4325_zps77d6336a.jpg.html



Here is the vaulted ceiling. After bracing and prepping the ceiling structure, the middle gets ripped out, subs go in, one goes to each corner.
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_3838_zpsb695e42e.jpg.html


Some other shots around the space. Layout will be the same after the remodel is complete
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_3841_zps82d4d362.jpg.html

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_3840_zpsf51f9711.jpg.html

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_3839_zpse75e4ebb.jpg.html
 

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wow, that should be awesome! As an infinite baffle guy, I love the idea of making use of the extra space to bolster your rooms performance!


speaking of ib, why go ib instead of a horn? Horn has awesome output, takes less power but ib is easy to build and sounds amazing. I'm running 2- 18's and a crown xls 1500 and it feel like it'll rip the house off the foundation....
 

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neat!


how do you intend to pick where to chop the hold in the ceiling?


also, might need to upgrade the mains...maybe. :)


"speaking of ib, why go ib instead of a horn? Horn has awesome output"


you answered your own question. funny the way the brain works is what freud says. :)
 

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Discussion Starter #5

Quote:
Originally Posted by dsl1  /t/1495785/dougs-dual-gjallarhorn-build#post_23858150


Welcome to the club. When are the dual Othorns joining the party?

Thanks! Good to be here. Baby steps...

Quote:
Originally Posted by rr14  /t/1495785/dougs-dual-gjallarhorn-build#post_23858183


wow, that should be awesome! As an infinite baffle guy, I love the idea of making use of the extra space to bolster your rooms performance!


speaking of ib, why go ib instead of a horn? Horn has awesome output, takes less power but ib is easy to build and sounds amazing. I'm running 2- 18's and a crown xls 1500 and it feel like it'll rip the house off the foundation....

I love building horns, and love the sound. I'm sure IB is awesome, but I just chose a different path. It would take quite a few IB subs to match the output of these two, and that would not qualify as a +10 on the WAF (unless I built a couple of manifolds), but that is another discussion entirely. Someday I would like to include some IB subs somewhere. Lake house maybe? I need to get one first...
 

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Discussion Starter #6
Here's the stack for one of the horns, minus the side pieces

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/photo1_zpsb121deca.jpg.html




I have 4 of these drawn out, then after re-reading Luke's build thread for the 20th time, I realized that I mis-measured the same corner by 1/4". Several of the numbers on the PDF were overlapped, so I misread the measurement. I think the rest are on target.

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/photo4_zpsa51025ec.jpg.html
 

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Quote:
Originally Posted by rr14  /t/1495785/dougs-dual-gjallarhorn-build#post_23858183


wow, that should be awesome! As an infinite baffle guy, I love the idea of making use of the extra space to bolster your rooms performance!


speaking of ib, why go ib instead of a horn? Horn has awesome output, takes less power but ib is easy to build and sounds amazing. I'm running 2- 18's and a crown xls 1500 and it feel like it'll rip the house off the foundation....

I remember thinking that about my DD-18...and then my single 5400...and then my dual 5400s...and then my quad 5400s... =)


The Ghorns give new meaning subwoofer violence...my concrete foundation hates me.
 

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Quote:
Originally Posted by d_c  /t/1495785/dougs-dual-gjallarhorn-build#post_23858235


Here's the stack for one of the horns, minus the side pieces

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/photo1_zpsb121deca.jpg.html




I have 4 of these drawn out, then after re-reading Luke's build thread for the 20th time, I realized that I mis-measured the same corner by 1/4". Several of the numbers on the PDF were overlapped, so I misread the measurement. I think the rest are on target.

http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/photo4_zpsa51025ec.jpg.html

There were a couple angles I had to re-draw quite a few times to get it right as well.


An easy way to tell if you have it right is that if you start at the beginning of the horn path, the beginning of the path will be smaller than the end of that path before the next turn, and the end of that path will be smaller than the beginning of the next path in the fold. If not, something's not right =)
 

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Discussion Starter #9
Thanks Luke, I found that a good way to check my work as well. Ricci's plans mention starting at the baffle and working outwards, bracing as you go. I notice that you went the opposite way. Any reason or was that a change in the plans?
 

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Discussion Starter #12
The first panel is already freaking heavy without anything glued to it! I envision putting my extension ladder to the attic with plywood strapped to it. 2x2 tracks for a furniture dolly screwed to the plywood. Horn strapped to the furniture dolly and hoisted up to the attic on the tracks with a wench or Z-rig, and 3 guys on each side guiding it, two in the attic to receive. I will have two 4x8 sheets of 15/16 decking down in the attic next to the vault to work on already for putting the bracing and sub mounts together. I always have lots of craft beer in the fridge, so people are always eager to help. This is going to be fun.
 

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Quote:
Originally Posted by d_c  /t/1495785/dougs-dual-gjallarhorn-build#post_23859926


The first panel is already freaking heavy without anything glued to it! I envision putting my extension ladder to the attic with plywood strapped to it. 2x2 tracks for a furniture dolly screwed to the plywood. Horn strapped to the furniture dolly and hoisted up to the attic on the tracks with a wench or Z-rig, and 3 guys on each side guiding it, two in the attic to receive. I will have two 4x8 sheets of 15/16 decking down in the attic next to the vault to work on already for putting the bracing and sub mounts together. I always have lots of craft beer in the fridge, so people are always eager to help. This is going to be fun.

We changed the venue for our GTG in August just so we didn't have to move the Ghorns up the stairs...I don't envy this task of yours at all. I'm guessing the cabinet without the 80lb driver weighs around ~300lb's...
 

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Quote:
Originally Posted by LTD02  /t/1495785/dougs-dual-gjallarhorn-build#post_23860031


the password is moving/lifting straps. :)

Uhhh...these are 45" long and 45" tall...so for us it was more that we would have had to remove the metal railing on top the stairs in order to make the turn out the door =)
 

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Discussion Starter #16
Oh boy... 1st panel (G) for the baffle (32 7/8") is 5/8 too long and I don't see the angled piece anywhere in the plans - Are my measurements correct on the side panel?


Shows how far over the baffle piece is compared to my panel mark (10 5/16" from the edge)
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_20462_zpsd5c631c1.jpg.html




do I cut this angle piece from scrap? Is 2.5 the correct distance from the edge?
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/15326b30-aad7-47e9-b98b-d6494f2a51cd_zps16f376bd.jpg.html
 

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Quote:
Originally Posted by d_c  /t/1495785/dougs-dual-gjallarhorn-build#post_23860203


Oh boy... 1st panel (G) for the baffle (32 7/8") is 5/8 too long and I don't see the angled piece anywhere in the plans - Are my measurements correct on the side panel?



Shows how far over the baffle piece is compared to my panel mark (10 5/16" from the edge)
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/IMG_20462_zpsd5c631c1.jpg.html




do I cut this angle piece from scrap?
http://s20.photobucket.com/user/ocd_reef/media/Home%20Theater/15326b30-aad7-47e9-b98b-d6494f2a51cd_zps16f376bd.jpg.html

I didn't put an angle on the driver panel. I just made two sharp angles on the 1/2" piece that connect the driver panel with the front panel.
 

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Discussion Starter #19
OK, I just matched my panels with your inch fractions on the Side Panel PDF in your build thread, and they are the same. I will proceed with matching my cuts to that vs. the actual measurements listed on the cut sheet, and do what you did there with the angled piece on the mouth. The 45 in the plans is too sharp for that piece. Thanks again! Back to the table saw.
 

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Quote:
Originally Posted by d_c  /t/1495785/dougs-dual-gjallarhorn-build#post_23860353


OK, I just matched my panels with your inch fractions on the Side Panel PDF in your build thread, and they are the same. I will proceed with matching my cuts to that vs. the actual measurements listed on the cut sheet, and do what you did there with the angled piece on the mouth. The 45 in the plans is too sharp for that piece. Thanks again! Back to the table saw.

Yeah, once I drew the template, I made all my cuts from measuring from the drawn template instead of the PDF.
 
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