Home Theater Forum and Systems banner

1 - 20 of 67 Posts

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #1 (Edited)
Here's the link to the planning and assistance prior to building:
http://www.hometheatershack.com/forums/diy-subwoofers-sealed-ported/18158-lone-15-llt-dual-12-sonotubes-chime.html

Driver Brand, Model, Size: Exodus Audio Maelstrom-X 18" Subwoofer (dual vc 2 ohm)

Enclosure volume: 465 L 16.4 cu.ft

Tuning frequency: 14.5 Hz

Some prices are estimates:

Maelstrom-X Driver ~$400 Exodus Audio
Samson PG2200 amp $240 SamAsh
Samson S-Convert $35 SamAsh
24" ID, 12' sonotube $70 Shepler's Concrete Supply
8 1/16" ID, 4' sonotube $8 Lowes/Home Depot
3/4"x4'x8' birch plywood $40 Lowes/Home Depot
1 1/8" subfloor fir plywood $leftover scrap piece
10-24 2 1/2" allen bolts with hurricane nuts $12 Sutherlands
Crutches $1 garage sale
5/16"x2' (x3) fully threaded bolts with nylocknuts, flat washers $6 Lowes/Home Depot
71"x7' Black Carpet $35 Lowes
1 Qt Carpet Glue $10 Lowes
Polyurethane Adhesive $4 Lowes/Home Depot
Eggcrate Mattress Foam (Queen, scrap leftover piece) $10 Target
RustOleum Gloss Black Oil-based Enamel $8 Walmart
Miscellaneous Tidbits $? (a bit more than expected, for sure)
Subtotal: ~ $1000

Help from HTS members...PRICELESS! :T
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #2
Automobile drivers gave me plenty of room on the highway...

Honey, you said it would fit in the corner! And be hardly noticeable!

Look your tubes over-and measure them! I got the right inside diameters (ID) for both, but you have to watch for ovalization? of the tube, which will give you an incorrect ID. Look out for creases and holes!?!

I also had a tube that was the joining of two segments, but I managed to use 6' of 'good' tube out of it.

While stripping the film, pull squarely away rather than at an angle and it will come off cleanly.
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #3
I used the wax liner to make a straight line around the tube for my jigsaw cut.

I bought the 'adhesives' and tested them on scraps to ensure compatibility/performance-this product adhered so well that the cardboard tube separated before the bond with wood even came close to failing.

The outdoor carpet glue takes longer than stated to cure, but is very strong once dry.

I made a circle jig for about $10 for my new router, 13A new vs 3.5A old one. It has a plunge base too, while I still used the old one to do roundovers without changing bits.

Measure twice (or thrice!) and cut once
 

·
Registered
Joined
·
1,001 Posts
You were the one that wanted . . . . . 14.5HZ ! ! Now look what you've done. LOL I think it's that last iddy biddy .5HZ that makes these enclosures look like the pillars at GIZA . . . . or is it CarnaK?
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #6
You were the one that wanted . . . . . 14.5HZ ! ! Now look what you've done. LOL I think it's that last iddy biddy .5HZ that makes these enclosures look like the pillars at GIZA . . . . or is it CarnaK?
I think mine will be blacker than black- maybe call it 'the black hole' :demon: I would have had it a few inches taller, but the carpet limited the tube to 5'11" and the corner space only allowed for 24" diameter tubing.

I told my wife about the 'stone column sonosub' a member built, and her reply was 'oh cool, I want to see it'. I am very fortunate indeed:jiggy:

The volume and tuning may be a tad off as I'm giving it a bit of leeway to account for port mounting, imperfect port calculation, etc. I wanted to ensure it met the HTS LLT standards :dumbcrazy:
 

·
Registered
Joined
·
1,648 Posts
The volume and tuning may be a tad off as I'm giving it a bit of leeway to account for port mounting, imperfect port calculation, etc. I wanted to ensure it met the HTS LLT standards
:rofl: Standards.........what standards? I hope I met the standard with 16hz. :dumbcrazy:

Looks like a fun project! Can't wait to see the finished project and read your BIG smile after you fire it up.

Matt
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #8
:rofl: Standards.........what standards? I hope I met the standard with 16hz. :dumbcrazy:

Looks like a fun project! Can't wait to see the finished project and read your BIG smile after you fire it up.

Matt
Thanks Matt. I'm sure your sub (and many members' on here) have all 'made the grade'.:yes: I've been back in school for a few years and my friends have moved on:sad: But my interest in electronics/audio has never gone away:dumbcrazy: I've been telling my wife how nice it is to have this excellent forum with exceptional people that are interested whether your system is small or large, and they especially enjoy helping you reach your goals. I've looked at so many helpful build threads, and now building my second, I hope that mine assists someone else in the future. I realize my carpentry skills aren't the greatest, but I can be creative.
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #10
wheres the sub at????
It's in the factory! :neener: Really, it is. Exodus is sold out of Maelstrom's and trying to catch up on production. A sonotubes a sonotube, right? Tough to customize it much, I think, beyond different legs, coverings while retaining WAF aesthetics. For my garage/home office sonosub, I'm still contemplating covering it with a heavy metal band poster or a 'celebrity', perhaps a scantily clad joan jett or lita ford:sick: Seriously, I am considering an iconic poster of Hendrix or someone else, but not sure if I could clearcoat it on nicely without it warping horribly:ponder:

I've got a couple days off starting tomorrow and will be working on the port flares and orthopedic portion, I mean, baseplate fitting :bigsmile: before disassembly and painting :yay: I have a feature Kevin H. of Exodus/others might like...thanks for the interest!
 

·
Registered
Joined
·
62 Posts
neat project. I'm interested in what you are doing with the two different thicknesses of wood, and of course the crutches.

Gluing the carpet is probably the best way to permanently hold it on. I ended up using staples, and only stapling the joint where the two ends meet. One side of the sub is in the corner anyway and I'm not sure I will always want this carpet...so it's easy to just pull out the staples and recover.
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #12
neat project. I'm interested in what you are doing with the two different thicknesses of wood, and of course the crutches.

Gluing the carpet is probably the best way to permanently hold it on. I ended up using staples, and only stapling the joint where the two ends meet. One side of the sub is in the corner anyway and I'm not sure I will always want this carpet...so it's easy to just pull out the staples and recover.
Finished the port flares and endcaps :jiggy: (except driver hole drilling/mounting). I'll be sure to take good photos of the plywood(s). I'm using black outdoor carpet, and I'm not concerned about changing colors, so I figure I'll glue it permanently. I just using the -inexpensive- crutches in place of tubing- I'll work on that tomorrow before disassembling to paint. Glad this is taking a while since I won't have the driver for some time...
 

·
Registered
Joined
·
2,074 Posts
Glen, I'm just getting caught up now, great work so far. Hey, that's what I forgot... have you thought about using a high pass filter (rumble or subsonic filter) like the Reckhorn B1 or Behringer MIC2200? It's a simple way to make sure your sub won't get damaged by overexcursion below the tuning frequency... of course, depending on your simulation, you may not need it, but I'd think the EP2500 would be able to give it enough juice below 14.5Hz to have the potential for damage. I'm not trying to scare you, just wondering if anyone's brought it up yet.

Keep up the great work!!
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #14
Hey Owen,

Yes, Mike P pointed that out to me. I thought it would be alright with the low tuning, but maybe I should reconsider...

Speaking of reconsidering. I came across a company, sound solutions audio that is selling the mach5 ixl18 for $265 shipped (currently out of stock, it will be in stock again very soon) and I consider it as a good bargain that I thought I couldn't get (the mach5 site wouldn't ship to texas) and was kinda weary of foam surrounds, but it looks like many high-end drivers use them. It seemed to model well, just less output than a mal-x. Just thinking, and any opinions appreciated.

Also, I was looking to order some connections, etc and looked at parts express that has the 300 and 500w bash amps for, I believe, very good prices right now. Could I get one and use it for a while, then switch it for an ep2500? I could then use the bash amp for my massive 10" sonosub (it is currently underpowered with 110w).

Both of these changes would decrease my initial cost significantly, only the dimensions of the ixl driver looks to be different than say, a mal-x or rl-p18...
 

·
Registered
Joined
·
2,074 Posts
Glen, I've heard some very good things about the IXL. I think what sticks out for me (and I may be doing this wrong) is that the IXL has a 22mm xmax, and the Maelstrom has 33. The IXL's Sd is also slightly smaller than the Maelstrom, and I calculate 4.5L Vd for the IXL, and 7.8 for the Maelstrom. That's nearly twice as much displacement. In most real world setups, will a Maelstrom get pushed to its limits? Probably not, in which case the IXL should still deliver in spades. I'm not trying to dissuade you at all, because I'm sure both will make a sub worthy of :yikes:

Edit: Just looked at it some more, it seems like they are closer to even as far as cost and displacement when you compare 3 IXL's to 2 Maelstroms. But that's just me procrastinating at work and doing subwoofer daydreaming math.
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #16
Glen, I've heard some very good things about the IXL. I think what sticks out for me (and I may be doing this wrong) is that the IXL has a 22mm xmax, and the Maelstrom has 33. The IXL's Sd is also slightly smaller than the Maelstrom, and I calculate 4.5L Vd for the IXL, and 7.8 for the Maelstrom. That's nearly twice as much displacement. In most real world setups, will a Maelstrom get pushed to its limits? Probably not, in which case the IXL should still deliver in spades. I'm not trying to dissuade you at all, because I'm sure both will make a sub worthy of :yikes:

Edit: Just looked at it some more, it seems like they are closer to even as far as cost and displacement when you compare 3 IXL's to 2 Maelstroms. But that's just me procrastinating at work and doing subwoofer daydreaming math.
Wish I had a way to compare through listening :wits-end: They both would have the capability to play low- the IXL just has less spl. The spl levels are so much more than the 10" I built, I wonder, how much do I need or will I use? Since it is for HT, I'm guessing the extra xmax comes in real handy:dontknow: Say, can I use winisd to model the output of my current svs cs-12 to compare to the others? (I'm at work until late)
 

·
Registered
Joined
·
1,648 Posts
Well, there are a few things to consider.

The Mal-X has almost double the displacement for less then half the cost.
The Shvia-X has almost the same displacement as the IXL for less money.

The other thing to look at is the Le which is MUCH lower on both the Mal-x and the Shiva.

Another item to take into consideration is the warranty and the after sales service which is AWESOME from Kevin!!

I almost went with the IXL but decided on the Mal-x and I am glad I did. I am sure I would of blown the IXL way past it's xmax by now. :)

Matt
 

·
Premium Member
Joined
·
19,397 Posts
The Mal-X has almost double the displacement for less then half the cost.
Half the cost of what? An IXL-18 is $265 and that includes shipping.

The Shvia-X has almost the same displacement as the IXL for less money.
Here are the Maelestrom-X, Shiva-X and IXL-18 modeled to Xmax with the appropriate high pass filters. There's a big a difference between the Shiva-X and IXL-18 as there is between the IXL-18 and Maelstrom-X.

maelstrom, ixl shiva.JPG
 

·
Registered
Joined
·
1,648 Posts
Half the cost of what? An IXL-18 is $265 and that includes shipping.
You are right Mike that made not sense at all. :) I meant if you take in consideration that the IXL is 220 and the Mal-x is 400 then you are getting twice the performance out of the Mal-x but at almost twice the price.

Interesting that the difference is that dramatic in WinISD between the Shiva and the IXL because when I did the math the Shiva was not to far behind the ILX in displacement.

Sd = 706.9 cm2
Xmax = 22 mm
(Vd) = 0.00155518 meter^3

Sd = 506 cm2
Xmax = 27
(Vd) = 0.0011132 meter^3

Using formula Vd = Sd x Xmax total

Matt
 

·
Premium Member
Joined
·
1,538 Posts
Discussion Starter #20
Thanks for the feedback guys:T I didn't think to model the three together: I just modeled the Mal-x, IXL, and my 10" aurasound spl paled in comparison, so the difference between the first two looked negligible. Things are a bit clearer now, thanks.

I'll stick with the Mal-x: it was my original plan to use it for my lone sub driver for a reason, eh?
 
1 - 20 of 67 Posts
Top