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The JohnBomb build - Page 3

post #61 of 82
3/9/12 at 9:16am
Beautiful wood, John. I hope the interior gets some of that, too.

Call me for drywall, I need practice.
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post #62 of 82
3/9/12 at 9:40am
Thread Starter 
Quote:
Originally Posted by Neurorad View Post

Beautiful wood, John. I hope the interior gets some of that, too.

Call me for drywall, I need practice.

Thanks, man. I need the practice, too!
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post #63 of 82
4/30/12 at 6:45am
Noticed your comments about ditching the DBA. There is an alternative that I think can make it accessible for more people. Simply do a front wall array and replace the rear wall array with treatment. In particular aim for some tuned traps that focus on primary and secondary length modes. This means halving the amount of power and drivers whilst allowing seating up to the rear wall.
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post #64 of 82
5/15/12 at 6:08pm
Thread Starter 
Quote:
Originally Posted by paulspencer View Post

Noticed your comments about ditching the DBA. There is an alternative that I think can make it accessible for more people. Simply do a front wall array and replace the rear wall array with treatment. In particular aim for some tuned traps that focus on primary and secondary length modes. This means halving the amount of power and drivers whilst allowing seating up to the rear wall.

Good timing with this post, Paul. I decided to go big or go home (see pic). Now, it's not even an SBA...more like a line array. I believe it was the Bland who said something to this effect: "for bass, shoot for way more than you think you need, then double it." Right now, I've got two QSC 3602 amps powering this array. After running some sweeps and testing the limits of the system (probably to the dismay of the integrity of my house), I think he's right. 30 min later, I actually still feel dizzy from the tests!

Yes, I will have tuned traps, broadband traps, possibly some VPR steel plate traps, etc... basically, the full monty. The rear speaker box which I had originally planned to use for the DBA will now be filled with fiberglass, tuned traps, or a combination of the two.

John
LL
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post #65 of 82
8/13/12 at 6:46pm
Thread Starter 
Just checking in. I've been speaker building! L & R front bass horns complete, 1 mid/high unity horn complete. Need to build 2 more unity horns and design/build center channel bass box. Measurements are from front bass horns, close mic'd at side walls, ground plane. Driver: Kappa pro 15 LF-2 for each. Goal: 70-300hz... not too bad! Speakers will be finished later. Stay tuned...

John




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post #66 of 82
8/13/12 at 9:34pm
I've been reading up on unity horns, they're intriguing. Have you done any listening with it yet (in mono)?

Those bass horns look cool too, curious how the folding looks, and how you settled on the shape?
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post #67 of 82
8/14/12 at 6:07am
Thread Starter 
Hey Brad,

I have done some listening in mono to my unity horn and it sounds really good to me so far (see sig for details). As far as the bass horns go, there isn't any folding to speak of. They are conventional (not tapped) offset driver horns (see crappy pic below) end have angled reflectors which seem to work. I played around with Hornsrep, guestimated the effective horn length, and then built an OSB prototype (for $7 a sheet, it's a pretty cheap test).

MiniDSPs will control all crossover/EQ duties. Looking forward to getting another unity built so I can at least listen in stereo!

John


Edited by johnbomb - 8/14/12 at 10:09am
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post #68 of 82
11/28/12 at 4:51pm
How on earth did I miss this build - very cool. Love the soffits!...and the subs...and the horns biggrin.gif
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post #69 of 82
11/28/12 at 7:04pm
Wow, impressive work. Can't wait to see some of your ideas fully constructed and complete.
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post #70 of 82
2/4/13 at 6:04pm
Thread Starter 
I really need to do a better job updating my progress. I've been chipping away at this- really, I have! It's just hard to find the time and to stay motivated... over 3 years now. Anyway...

I have more or less settled on a design plan. Like many of you, I find "upgrade fever" tough to shake, only my upgrades keep happening midstream... don't change horses, and all that frown.gif With that said, I have done quite a bit of research on sound and speaker design. I've decided to adopt the Earl Geddes multi sub approach, which you can read about here:

http://www.gedlee.com

This approach will hopefully solve may problems for me with one solution. Dr. Geddes watches his movies in a very well damped room- read posts #648 onward (page 65)

http://www.diyaudio.com/forums/subwoofers/134568-multiple-small-subs-geddes-approach-65.html

Building this type of wall will not only hopefully damp subwoofer frequencies, it will provide a large measure of sound proofing (my adjacent HVAC makes plenty of noise). Also, it will allow me to get the look I want- modern and smooth. Here's what I've done so far:


Used a handplane to shape the curves on the form.


Used 1/4" drywall. Unlike the relatively easy bending around the soffit formers, this was much tougher: I had to score the drywall multiple times and glue it onto the forms, held in place by lots of temporary drywall screws... I'll mud it later.




Fast forward several months later- RC-1 channel is up, gluing/screwing hardipanel. It's heavier and thinner than drywall. Oh yeah- I built a surround speaker into the wall smile.gif





I got this LED strip at http://1000bulbs.com/product/56846/SIV-IFL6012A.html

I built a GFCI outlet into the wall and tucked the cord into the leftover space. I'm going to hardwood the floor, and once that's done, I'll add a baseboard to cover up the fiberglass.

This is really haphazard, and I'm sorry! i need to take more pics and update more often. I'll try to do better, I promise!

John
Edited by johnbomb - 2/19/13 at 1:00pm
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post #71 of 82
2/5/13 at 3:49am
Cool lighting concept!

I'll have to visit soon, and see where you put the GFCI outlet.
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post #72 of 82
2/5/13 at 5:56am
Very nice build so far!
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post #73 of 82
2/5/13 at 11:05am
Do you mean the baseboard will directly cover the open wall cavity at the bottom (no drywall there)? If so, wouldn't that create a flanking path for sound leakage?
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post #74 of 82
2/5/13 at 2:19pm
Thread Starter 
Quote:
Originally Posted by Brad Horstkotte View Post

Do you mean the baseboard will directly cover the open wall cavity at the bottom (no drywall there)? If so, wouldn't that create a flanking path for sound leakage?

It won't be ideal, but I have, on the outside wall, in order: 1/2" drywall, 2 layers of 1/2" inch hardibacker, and 3" rock wool (I'll add rock wool to the remaining uncovered lower wall, best seen in the second to last pic above). Also, the portion of the wall that will be covered by the baseboard is further separated from the HVAC by the adjacent staircase. I don't think it will be an issue. If it is, I'll attack the furnace room with more drywall/greenglue as needed.

John
Edited by johnbomb - 2/6/13 at 6:18am
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post #75 of 82
2/6/13 at 3:51pm
Thread Starter 
Got the glue up/screw up of the wall finished today...


Here's a pic of the liquid nails/green glue mix.


Just need to mud!

John
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post #76 of 82
2/17/13 at 4:17pm
Thread Starter 
Started the far wall today...





The color differences are from color casts- the cool white light is what will ultimately be seen. Also, the shadows are boosted in this shot- the light level is actually much lower. The far lights aren't hardwired yet but are plugged in, just to get a feel for the lighting. Hardwiring next...

I'm actually starting to feel like I could watch a movie in here!

John
Edited by johnbomb - 2/17/13 at 4:42pm
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post #77 of 82
2/18/13 at 10:38am
Looking good, John!

Any thoughts about eventual control? iPad, Android, RF to IR?

Do you need outlets in the room, for code or anything else? Those GFCIs look a little hard to get to.
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post #78 of 82
2/18/13 at 12:44pm
Very interesting build. looks like this is not your first theater build! What are you going to do with the floor?
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post #79 of 82
2/22/13 at 10:01pm
Thread Starter 
Thanks for the kind words!

Neurorad- an ipad controller had crossed my mind. As far as the other outlets go, I forgot to show you guys these...



Here's the GFCI for the far wall that I just finished...



vikgrao- actually, it's my first build. I sure hope it looks as good done as it does in my head! The floors will be covered by medium dark hardwood with a low gloss finish, maybe with an oriental area rug.

Thanks,
John
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post #80 of 82
2/23/13 at 3:26am
Quote:
Originally Posted by johnbomb View Post




Here's the GFCI for the far wall that I just finished...



 
Is that GFI plug going to be inside the wall?
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post #81 of 82
2/23/13 at 6:43am
Thread Starter 
Yes. It will be recessed (when viewed from the floor looking up) but accessible. See the seventh image down in post #70 to see how it looks in the opposite wall.
Edited by johnbomb - 2/23/13 at 7:47am
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post #82 of 82
5/6/13 at 12:57am
Any updates for us?
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