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Discussion Starter #1
Folks, I'm really excited about my newest build. I think this will finally be enough LFE for me without breaking any drivers.

The what:
I made the decision to go with the current champ of bass-horns, Ricci's GJALLARHORN. It uses a single TC Sounds LMS-Ultra 18" driver, measures 45x45x24, weighs in at 300 pounds, and measures flat to 16hz at 118db, or up to 130.9db at the 80hz XO point for my system. I'm building two.

The why:
This year's rage seems to be high db at 10 or even 5hz. I personally feel extension this low is pointless for my system because I cannot feel anything below 15hz, I cannot hear it, the amps hate it, the house jiggles and rattles and shakes above any sound that I would hear, and I have to rearrange all of the stemware in the kitchen afterwards. So sub 15hz tuning for me - out. The G-Horn drops at 16hz, so the power fed to it will be used in all the right places. I have a history of breaking drivers because I like to watch good films at near-reference, or close to it, and my system has never been capable of handling it through poor design by me. Movie night at my house is an experience. I look forward to it all day and want to be able to put the remote down, stop having to throttle down the sub channel when movies like Olympus Has Fallen have over the top LFE. I need one hand to hold my wife's and the other for a craft beer. When I work around the house on projects on my days off and the girls are at work or school, I like to turn it up to 11. My neighbors are deaf, so why not? Childish? You bet! I want to set it and forget it, I want for the LFE channel to have more than is necessary at 75%. I believe that two GJALLARHORNs will make this happen for me.

The gear:
I will use a steep 24db Butterworth HPF as suggested and EQ with a balanced MINI DSP using the Advanced 4-way plug-in, measured by the Cross Spectrum calibrated UMIK, corrected with REW. The amp used is the Sanway Lab Gruppen clone fp14000, 120v version with 33db input gain and 140v hard limiting. Each G-horn will be on it's own channel on the fp14000 at 4ohms. The A/V receiver used is the Onkyo 818, using THX arrangement of the surrounds with 80hz LPF, full mains, 50hz center.

The place:
These will be in our 2781 cu^ft living room with 12' vaulted ceilings, many windows and 3 openings to other rooms. WAF is paramount to keep this hobby rolling for me, so the horns will be mounted in the attic, behind the front wall, 9' from the floor of the listening room. They will be placed at the center point, and again half way to the left corner. They are placed at 1/4 points to help with nulls in the room modes as discussed in Floyd Toole's White Papers. Thanks to Sanjay for his help with this. I also used REW room simulator as well as "the crawl," and SPL readings with the UMIK and REW by positioning one of the subs at the LP and measuring at the proposed positions. All tests found that these positions were two of the top 3 places. L and R corners were best, but one sub cannot be placed there due to construction limits, so the best "pair" is at the decided positions. The center of the horn mouth will be at 9', and the horizontal centers of the quarter points, and opening flush with the visible front wall of the room. I'm not sure what I will use to cover the horn mouth yet. WAF here again, so I will probably have to think of something. I like the stealthy idea of completely hidden subs.

The when:
Now! I found a Baltic Birch supplier today in KC with both 18mm 5x5 panels for $47 per sheet, and 12mm for $34 per sheet, for 13 sheets total. WHEN I finish remodeling the bathroom in about 3 weeks, the sheets will be here. I need some t-nuts and bolts, Kreg jig screws, PL, and all other gear and equipment is already in use in the HT. Ricci sent me the awesome set of detailed plans for the G-horn a couple of days ago. The installation won't happen until after Christmas. I remodel one room per year in our 1975 house, and the living room is the one for 2014. The horns will be lifted in to place with a hoist to the attic after I demo. But first, I have to finish remodeling the bathroom or my wife will kill me. I better go grout this shower, install the floor, put in the glass door, trim, prime...



Photo from the LP. Subs go top center and half-way to the left corner:




The Gjallarhorns




 

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This should be a good one... In to see how it is done and what you think of it when it is done.
 

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I will wait to see more pics because I am confused on where your opening will be. Seems like the kitchen ceiling will interfere with where I thought the opening will be. :huh:

BUT either way this should be a great build. Look forward to Xmas getting hear now. :D
 

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Discussion Starter #6
Cool project. Looking forward to this one as well. It sounds like your kitchen ceiling is not as tall as your living room, i.e. there is attic space above the kitchen where the subs will be concealed? I agree with chrapladm though, tough to tell from the photo.
Right! The kitchen is lower and flat. There is just enough room for the vent of the left sub - the right side of the vent is where the light reflection is above the doorway. The middle one has plenty of room and will be offset about a foot to the right of the tv. The space between the two doorways is not centered to the room. There wouldn't have been enough room for the one in the 1/4 space on the left for a driver when I was wanting to put a ported enclosure there. I would have had to put them both in the middle and have 3 nulls instead of two.
 

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Right! The kitchen is lower and flat. There is just enough room for the vent of the left sub - the right side of the vent is where the light reflection is above the doorway. The middle one has plenty of room and will be offset about a foot to the right of the tv. The space between the two doorways is not centered to the room. There wouldn't have been enough room for the one in the 1/4 space on the left for a driver when I was wanting to put a ported enclosure there. I would have had to put them both in the middle and have 3 nulls instead of two.
Ok, that's about what I had in mind, but that clears it up for sure without being able to see the kitchen ceiling. Do you at least have some initial thoughts on how you will treat the openings? I think the asymmetry would bother me but I can be a tad OCD at times. Your room looks bigger than your calculated volume suggests. Probably because of the vaulted ceiling. What sub(s) are you currently using?
 

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Discussion Starter #8
The vault looks higher than it is: 12' and change at the top. I would like to color match some fabric to cover the vents, but that's as much as I've come up with yet. I'm open for ideas!

I had two 19hz SDX15, now two LMS-U sealed. After the horns are built, remodel is finished, furnishings are bought, then I would like to begin some Statements for LCR (subject to change 10x of course).
 

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I would just use a grille material and have a picture printed on. Then it would just look like two paintings or pictures being hung. Similar to GIK Art panels. You would never know there were subs there until they were being played. Then you might see some flex from the picture.

Just a thought.

You already have the horn mouths exits figured out?
 

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Discussion Starter #10
That's a great idea. There is a place in town that prints football jerseys, and I thought that would be a great idea for covering speaker grills with printed spandex. The mesh material might be porous enough for the sub vents. The placement for the openings are rough right now. I won't be able to get the exact placement until I rip all that paneling out. The big cedar beams are coming down too, so that's extra space if I need to raise the height above 9'.
 

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I would just use a grille material and have a picture printed on. Then it would just look like two paintings or pictures being hung. Similar to GIK Art panels.
I like the idea of printed grille material too. Or what about making them look like HVAC intakes or something? It might add to the stealth factor. Will you keep the wood paneling on the walls after the remodel?

I had two 19hz SDX15, now two LMS-U sealed.
Interesting. The LMS-U's are not doing it for you? My HT is a little smaller than yours (~2300ft³) and I have been looking at doing two (maybe 4) of the SI 15" subs in 3ft³ sealed boxes. Do you have more than one room attached to the living room?


After the horns are built, remodel is finished, furnishings are bought, then I would like to begin some Statements for LCR (subject to change 10x of course).
Of course!
 

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Discussion Starter #12
The walls will be Sheetrock, so the hvac idea would work too. They make a a wood grid for old house floor returns. I could paint that wall color and it would blend in nicely.

There are some big openings in the room so it has trouble pressurizing. Two ported lmsu would be enough if I placed them in the corners.
 

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Discussion Starter #14
A little progress this week. I climbed around in the attic for some prep work and found that there is a load bearing beam right in the middle of one vent, and a bundle of wire in the middle of the other. I am back to putting one in each of the corners on the left side of the room, vented through the vaulted ceiling. It also models fairly flat with Room Sim in REW, with not much of a loss in db. The front left corner modeled best, back corner worst. The two together work nicely to compliment each other for the room modes. It should work nearly as well, but not as nice as they would on the front wall.

I picked up the Kreg Jig, screws, and 90 degree attachment for the drill today. Not too long before I start making sawdust!
 

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Love my Kreg jig. Made things so much easier.
 

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Looks like this will be an awesome build. If you want to conceal the grilles, do a google search for "diy movie poster acoustic panels" and you'll get a link to a great reference thread with the James Bond posters. You can have them printed to look like anything at all.

My neighbors are deaf, so why not?
Just an amusing side note on this. My mother in law, who is deaf, was visiting one day when a friend and I were watching Die Hard. I guess we had it turned up a little loud, because she came into the room with the "WHAT ARE YOU TWO IDIOTS DOING!?" look on her face. While she couldn't exactly hear it, deaf people are pretty sensitive to other subtle senses, and she DEFINITELY felt it, and knew we were up to no good.
 

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Discussion Starter #18
Funny! I have decided to paint the inside white and go with no grills at first, and then see what happens. The printed panel idea was the top of our list before they moved back to being ceiling mounted through the attic. I'm surprised we don't see more people using that for speaker concealment and sound treatment panel covers.

I have only to paint my bathroom today and install a countertop and I should finally be able to get these things started in the next week or 2.
 

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Discussion Starter #19
I'm finally ready.

I spent the last few hours going through the 37 pages of plans for the G-horn, learning the process, and converting each measurement to fractions from their decimal form. I have 9 pieces of 18mm Baltic Birch and 4 pieces of 12mm to order tomorrow for Thursday pick-up.

Already planning the new mains, front highs, and surrounds... I have a sickness!
 

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So I take it you are using 5x5 sheets?
 
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