7.6 cu.ft Maelstrom- X 18" build - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #1 of 305 Old 07-30-09, 10:18 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
7.6 cu.ft Maelstrom- X 18" build

My Uncle and I have started working on my box. It will be around 7.6-7.8 cu.ft after bracing and everything is accounted for. There aren't many pictures becuase it is only about half way done. I will hopefully be getting more before it is done, and with the driver installed and in my room.

The box dimmensions are 48" tall and 20" deep and wide. We will have two window pane style braces. One near the top of the port about 2 inches away, and one about 5 inches above the driver. We will be runing a strip of thin wood between these two braces to help keep those braces "braced." lol.

The port is 18.50 inches wide, 2 inches tall, and 55 inches long. The length is divded into two parts, one 34 inches long, and another is 17 inches. There is a 45 degee piece of MDF that will go between these two pieces of wood which will keep the port at two inches from the back wall; I don't remember how long that one was though. There is also another 45 degree piece of MDF that is on the bottom of the port so that it will have better air flow. That also was cut the right length to keep the two inch spacing correct.

Drawing everything out first:



The cut outs ready for nailing and gluing:





The 45 degree angle for 17 inch part of the port:



Don't remember what this one was for, just looks like another cut out picture:

IMG]http://i536.photobucket.com/albums/ff323/airsoftsniperm4/UTGM324Gen3forSale034-1.jpg[/IMG]

Assemblig the slot port:





Roundover on the top of the port:



Port exit. The lighter piece of wood is for a better screwing place for the front pannel, as it will be just screwed on so it will be easier to maintain if needed. I will make sure that the holes will be pre-drilled so the wood won't split, although I am pretty sure my Uncle already knows this becuase he is a very experienced wood worker.

The port exit will have a roundover to help with chuffing and port noise.



A quick look at a Ford Ranger Pre-Runner by my house. They have around $150,000 tied up in that easily.







There is one neat thing that we might be doing for this box. Since the Mal-X wieghs in around 50 pounds we will be taking 1/2 inch steel and making a mounting ring that will go on the inside of the box, right where the mounting screws will be, so the screws have extra strength to support that weight. Hopefully, we will have it done, but my Uncle is really busy and might not be able to get that finished. We might be spraying on a bed liner to protect the box, but I will have to see how much it is first. Otherwise, I will just go with Flat Black. It will have a small roundover on all outside edges of the box to keep it from splintering if it hits a wall, of something, and it just looks better to boot.

Any questions or comments are welcome.

That's about it for now. More to come later.

Last edited by sub_junkie; 08-07-09 at 12:44 PM. Reason: pictures went away?
sub_junkie is offline  
Sponsored Links
Advertisement
 
post #2 of 305 Old 07-31-09, 12:56 AM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: 7.6 cu.ft Maelstrom- X 18" build

Congratulations on finally getting underway, I'm sure you won't be disappointed as I'm still amazed at what the Shiva 12 can do in a big enclosure. Gotta love that Toccata & Fugue.
looking forward to more pics.
With the mounting ring are you going to tap it and use bolts to mount the driver?

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
post #3 of 305 Old 07-31-09, 09:19 AM
Shackster
Jukka
 
Join Date: Mar 2008
Location: Finland
Posts: 65
Re: 7.6 cu.ft Maelstrom- X 18" build

Nice, you got things going, eh.

So I threw the data in the unibox and it says you are going to end up with 14,6Hz tune when box is 7,6cf (215L). Pretty nasty port resonance just after 100Hz though.
7.6 cu.ft Maelstrom- X 18" build-vb-response-maelstrom-x-gen2.gif
7.6 cu.ft Maelstrom- X 18" build-vb-portairspeed-maelstrom-x-gen2.gif

Last edited by Jugix; 07-31-09 at 12:26 PM.
Jugix is offline  
 
post #4 of 305 Old 07-31-09, 02:06 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: 7.6 cu.ft Maelstrom- X 18" build

The first port resonance is 114 hz which may not be an issue since the port is folded. If it does cause an issue he can always use a lower crossover point.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #5 of 305 Old 07-31-09, 09:20 PM
Elite Shackster
Mike
 
Join Date: Nov 2007
Location: San Dimas, CA
Posts: 1,633
My System
Re: 7.6 cu.ft Maelstrom- X 18" build

Nice to see you got the build underway.

What are you going to use for a high pass filter?

I am most interested to see how it turns out as I still have another Mal-X sitting in the box waiting to be used and abused.

Have fun.
sub_crazy is offline  
post #6 of 305 Old 08-04-09, 12:07 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

Quote:
robbo266317 wrote: View Post
Congratulations on finally getting underway, I'm sure you won't be disappointed as I'm still amazed at what the Shiva 12 can do in a big enclosure. Gotta love that Toccata & Fugue.
looking forward to more pics.
With the mounting ring are you going to tap it and use bolts to mount the driver?
I listened to Toccata and Fugue with my current sub, and needless to say, it was very overwhelmed.
The steel plate will be cut with a Plasma cutter as far as I can remember, and it will be tapped and I think we will use bolts. Not sure about that yet though.

Jugix, thanks for the graphs. When I modeled the slot port in WinISD, it said that the maximum port air speed was 26 or 29 m/s. I don't have WinISD on me right now, but will check again when I get back home. I am currently at Texas for my Grandpa as my dad, mom, and I drove his motorhome down for MD Anderson Cancer Treatment.

sub_crazy, I will be using a Reckhorn B-1 for the HPF, and a EP2500 in bridged mono as the amp. I will have a modest HPF set as not to stress the driver too much, and I will keep the levels down some
Didn't the EP2500 put out around 1900w in bridged mono operation?
Also, is the mounting cutout still 16.6 inches as the notes on Diycable says it is?


Thanks
sub_junkie is offline  
post #7 of 305 Old 08-04-09, 01:14 PM
Elite Shackster
Mike
 
Join Date: Nov 2007
Location: San Dimas, CA
Posts: 1,633
My System
Re: 7.6 cu.ft Maelstrom- X 18" build

You ever thought about using the ED eQ.2 instead of the Reckhorn? It is about $25 more but adds 2 bands of EQ along with the subsonic filter. I used one for my brothers set-up and for the price works well.

There was a place were you could get a refurbished eQ.2 for about $75 but I don't recall the site. If anyone knows the site for the refurbs could you post it here as I would not mind picking one up myself.
sub_crazy is offline  
post #8 of 305 Old 08-04-09, 04:00 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

I would get the eQ.2, but it doesn't have the input voltage boost which I would need cause my receiver only puts out 1v for the pre-out channel

Thanks for the suggestion
sub_junkie is offline  
post #9 of 305 Old 08-05-09, 04:32 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

Some more pictures. I have a feeling I am going to love how it will sound.









That's my KLH 10" driver next to the Mal-X. Pretty big difference lol







I am going over to my uncle's tonight and will hopefully have the box finished, except for the truck bed liner. More pictures to come then also

Thanks again for all of the help everyone

Last edited by sub_junkie; 12-17-09 at 04:49 PM.
sub_junkie is offline  
post #10 of 305 Old 08-06-09, 06:50 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

Finally got the box finished. It will be painted soon, just didn't have time last night as my uncle and I fnished it at 2 am.

Posting pictures in a litle bit.

The sound quality is awesome. I can' believe how low it goes. But, my current amp clips horribly at high volumes, and sounds like the driver is bottming out, but, of course it's not
On Down 4 Tha Krown, is hits harder and lower than my brother in law's truck that has two Kicker COMP C10's on the Kicker 200.2 amp. His can go louder than mine right now, but it's becuase my amp clips up loud.
Quick question; I have 2 inch thick Egg Crate foam grey colored, and was wondering if it is open cell or closed. When I pore water on it, it just absorbs it like a sponge, but if I take off about an inch of thickness, it goes right through it. Does this mean that it is open cell?

Thanks
sub_junkie is offline  
Reply

Bookmarks

Tags
18" , build , cu.ft , maelstrom-

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome