Exodus Maelstrom X 18" 8.5 cu ft sealed

lsiberian

lsiberian

Audioholic Overlord
I did, it`s just i had a mental lapse with the first batch!
better a mental lapse with the pictures than with the router or saw. I always cut a wrong dado on shelves. :rolleyes: I usually forget to count the shelf part lol.
 
KEW

KEW

Audioholic Overlord
GranteedEV

GranteedEV

Audioholic Ninja
Omg i want a lambhorghini sub in my bedroom... It can be my bed too i don't care if i'm 20!
 
GranteedEV

GranteedEV

Audioholic Ninja
some updates:



Lazy attempt at bracing... I should have braced it with about 2 more shelf braces and more vertical bracing but I think I hit a threshold of "this is enough and I just don't WANNNAAA"



The middle brace is only at on the backside:



Shoved like three pillows in there even though my box q (.58 or so) was low enough as it was >_>... I hope It's not too overdamped. And yes, the insides are just oozing with silicone at every joint.



Ghetto attempt at making an air tight binding post... and the green in wall speaker wire from Rona matches the carpet?!:



I need to clean this place up a bit + lost a 10-24 x 2 1/2 screw somewhere + two t-nuts didn't dig in properly and fell out.. should probably glue them in if I can find the hot glue gun:



Early listening impressions. I've got the e55tis running as "small" and an 80hz crossover...

What can I say... it's hard to put into words what this sounds like. In a sense it's the most inaudible subwoofer I've ever heard. That isn't to say it doesn't slam you in the chest hard if the recording (or test tone :eek: ) calls for it but it's so hard to describe how this subwoofer just dissapears - I think it's the very low harmonic distortion that's causing it - what i'm experiencing is probably JUST the fundamental. This thing is supposed to be near linear right up to x-max or so. I wouldn't doubt it. It's just such a quiet loud sub!

I watched "The american" yesterday in the middle of the night and I'm not gonna lie... those were the most realisticly reproduced gunshots I've ever experienced - WITH dynamic range control on!

I also popped in a single song (Monster - Kanye West) and all I can say is that the drum machine used in the track could not sound and feel more like the real thing! Not only a visceral experience, but what seems like a really well mastered CD too. I'd been holding off on giving it a proper listen until the sub was done.

I'm debating whether I want to finish the exterior on this one first... or save up for another and finish them both together. This was definitely a tasking project... I'm sure you can imagine how difficult it is to build such a large and heavy box properly. Even the driver's ridiculously heavy. A part of me wants to never build a box this big again for those reasons, yet the other part is screaming to get the second one again. Another thought is to make a typical .707 Q instead but.. call it snake oil or not... I like what I've heard with this box so much that I just can't imagine messing with the formula!

Either way the next step before anything is to get some measurement equipment, a PEQ, perhaps a high pass filter, and get this one right. I haven't even toyed much with placement yet... I need help pushing it around! :( Since it is a sealed sub, I need to know how much (er.. little in this huge open room) room gain I've got. I do have the amplifier and xmax headroom to throw in a linkwitz transform to make it flat to around 20hz or so but that will have to wait until I get real measurements. Of course getting a second one will probably help moreso. For the time being, as it is it's awesome.

I didn't build this thing with the goal of ridiculous output. I feel one needs multiple subs... always. I built this thing for what I perceived as measurably good sound quality in a very large room... with the plan of buying a second eventually. I don't think I've dissapointed myself. I just wish it didn't weigh 300-400lbs @_@ And... I dont doubt it's capable of ridiculous output... I'm afraid of my subwoofer.

P.S. Can any mod change the name of this thread to "Exodus Maelstrom X 18" 8.5 cu ft sealed"?
 
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billy p

billy p

Audioholic Ninja
Heh...I still like Warp's methodology. Buy the driver and have somebody build you the enclosure, I just can't remember what you called it the other day ...but yeah that's what I would do....:p.

Otherwise, looking good but you'll need to finish for total WAF....:)
 
GranteedEV

GranteedEV

Audioholic Ninja
Heh...I still like Warp's methodology. Buy the driver and have somebody build you the enclosure, I just can't remember what you called it the other day ...but yeah that's what I would do....:p.

Otherwise, looking good but you'll need to finish for total WAF....:)
I wish I knew someone who would make it for me too... i called around and the only actual quote I got was $1800 :eek:

Even if I did get it made though... I would need to carry it down the stairs! At least this way it was built in the basement and stayed there!

as far as finishing it...

1) it'll have to wait til winter's over. It's been a pretty mild winter actually.. we got into the plusses this one day in december, but it's still no weather to be working outside.
2) veneer, satin, or gloss finish? I just don't know! I love going to the Salk Sound website just to drool at their finishes! What I'm leaning towards is something like satin black sides:

http://www.salksound.com/home_htm_files/175.jpg

with an exotic veneer on the front... maybe something like this:

http://www.salksound.com/home_htm_files/372.jpg

It'll take a lot of photoshopping before I even decide what'll look nice :p

...my dad suggested arborite. I've never considered it for a speaker build but I like the idea. It doesn't "shine" but it seems relatively "easy" :p
 
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its phillip

its phillip

Audioholic Ninja
Nice work. I'd be too lazy to put a finish on it after building it :D
 
darien87

darien87

Audioholic Spartan
as far as finishing it...

1) it'll have to wait til winter's over. It's been a pretty mild winter actually.. we got into the plusses this one day in december, but it's still no weather to be working outside.
2) veneer, satin, or gloss finish? I just don't know! I love going to the Salk Sound website just to drool at their finishes! What I'm leaning towards is something like satin black sides:

http://www.salksound.com/home_htm_files/175.jpg

with an exotic veneer on the front... maybe something like this:

http://www.salksound.com/home_htm_files/372.jpg
I'd recommend finishing this one first before you go building another sub. That way you can learn from your mistakes, and you will make them. I know the finish on my second sub was sure better than the finish on my first one.
 
lsiberian

lsiberian

Audioholic Overlord
I'd recommend finishing this one first before you go building another sub. That way you can learn from your mistakes, and you will make them. I know the finish on my second sub was sure better than the finish on my first one.
This is why I paint, but I'm considering redoing the reference towers so that is unnecessary.
 
lsiberian

lsiberian

Audioholic Overlord
You Know Grant that the ported version of this sub likes an 8.5 cuft box too. A couple passive radiators just might do the trick if you decide you need more output. :D
 
GranteedEV

GranteedEV

Audioholic Ninja
You Know Grant that the ported version of this sub likes an 8.5 cuft box too. A couple passive radiators just might do the trick if you decide you need more output. :D
heh. I've considered it. The original plan was to go with a 490L sonotube ported box, and then the second plan was to make a transmission line box.

When I finally decided on sealed, I intentionally made it internally big enough to accomodate a future switch to PRs.

:D I would go with a 16hz tuning as I think that would give a reasonably flat in room response:



But before I ever plan on that I need to have two separate subs.. that other choice would be made after that.

I'd recommend finishing this one first before you go building another sub. That way you can learn from your mistakes, and you will make them. I know the finish on my second sub was sure better than the finish on my first one.
Option A - Get the finish right on at least one sub
Option B - ...More... bass

... it's tough.
 
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lsiberian

lsiberian

Audioholic Overlord
heh. I've considered it. The original plan was to go with a 490L sonotube ported box, and then the second plan was to make a transmission line box.

When I finally decided on sealed, I intentionally made it internally big enough to accomodate a future switch to PRs.

:D I would go with a 16hz tuning as I think that would give a reasonably flat in room response:



But before I ever plan on that I need to have two separate subs.. that other choice would be solely for the subsonics.
The beauty of the P-Rs is you can mess around with different tunings and see what you like most. Dual subs is definitely a great move though.
 
GranteedEV

GranteedEV

Audioholic Ninja
The beauty of the P-Rs is you can mess around with different tunings and see what you like most. Dual subs is definitely a great move though.
I wish CSS made 18" PRs. I like how the tuning nuts go on in the dustcap on their PRs.

But yeah, i want the foundation for great bass quality in place first before I worry about max output capability.
 
GranteedEV

GranteedEV

Audioholic Ninja
After some thought, I'd decided that this subwoofer will remain sealed. Any other subs I add, will only be to improve my in-room response. This is the in-room response I have measured with this subwoofer alone, crossed to my mains at 80hz... there's some definite use a second and third sub will have, when I get to it. As you can see, I'm pretty much flat down to 20hz in room without any EQ boost, and it is a pretty BIG room with lots of openings into other areas.. you can probably effectively call it around 7 to 9k cu ft



Here is the finished version; don't mind the crappy lighting conditions / camerawork please.

 

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