Maelstrom-X Horn - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 113 Old 01-02-11, 10:49 PM Thread Starter
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Quote:
mdrake wrote:
Wow, great job!!!!! Can't wait to see the finished product.

Matt
Matt, I have the pictures, but will have to upload them tomorrow sometime. I have to study for school stuff since it's starting back tomorrow.

Ricci, I am definitely glad I got this....monstrosity built. I would hate to see you guys sacrifice your time to plan it, and have it not get built.

Soho, too late now :P. I should have checked the forum one last time before we sealed the box up. Luckily there are only about three "open" spaces that could absorb sound. . Oh well.



I just listened to it...I'm very pleased with how it sounds. And it's not even eq'd yet. I only have one major problem...the panel that the sub mounts to is moving around on the back side of the box, and it creating some nasty noises while playing content. We glued and nailed the snot out of it, so I'm not entirely sure how it's moving like it is. Looks like I'll be taking it easy on the volume levels until I get triangles installed in there, and until it's siliconed in for good. Oh well. I should have that done by Tuesday. Until then, I'll be doing some low level listening for sure.

Thanks again guys for all of the help. This thing looks really sick, and I can't wait until the external gets painted (more than likely on Tuesday also). I'll try to remember to upload the pics tomorrow also.

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post #12 of 113 Old 01-03-11, 08:04 AM
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Re: Mal-X horn folded?

Dylan,

How does it compare to the last build you did in terms off depth etc....

Be good to get a comparison and some graphs off each too.

cheers

Graham
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post #13 of 113 Old 01-03-11, 09:49 AM Thread Starter
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Quote:
gperkins_1973 wrote:
Dylan,

How does it compare to the last build you did in terms off depth etc....

Be good to get a comparison and some graphs off each too.

cheers

Graham
The horn definitely has a more full sound. It goes wayy lower than my old box, and seems to have a tighter overall sound to it. Comparing my old box to this one, I would have to say that it sounds like I just went from a 12" sub to an 18" sub. Just to describe how much deeper and more full it sounds. I'm not entirely sure how much louder the horn is over my old box, but it definitely seems to be louder with less power.

I need to get some measuring equipment. All I would need is a mic and a power supply (or something) for it, right? Could I just use my Antimode's mic instead of buying a new one?

I'm uploading pics...

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post #14 of 113 Old 01-03-11, 10:19 AM Thread Starter
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Alright, here's the finishing pics of the box!

Starting to nail and glue part of the inner workings of the horn



A few more pieces held in place now



Different perspective



It's really starting to take shape now.



Getting the last few pieces glued and nailed down



Looks like a missed a picture from the last one until this one...my bad .



Mounting the sub after the hole for the input cup was made



Still got that Monster logo on the sub...



Placement of the input cup. I could have placed it differently, but wanted to have the least amount of wire as possible.



Here's the box before we put it in the bed of my Uncle's truck to take it to my house...man this thing is heavy...



Got a nasty reflection off of the plexi, but you can still see it at least.



Here's the horn in my room (messy room...at least I have an excuse for it now that I was in the construction stages of building an awesome box haha)



(all of these pics were taken on my iPhone 4...let me know how they look on a computer )

I'll get some more pics of it's placement in my room later on today. On Tuesday, my Uncle and I are going to round over all or most of the exposed edges, fill all the nail holes and sides of mdf in with putty, and start/finish painting it. I'm not sure how much paint this thing will take, but I think six cans of trick bed liner black should do it. .

I'll let you guys know if I find something different sounding in it that wasn't in my old box.

Thanks yet again for the help. I can't believe I have this box sitting my room right now. I figured it would have never happened some how. Definitely a big thanks goes out to my Uncle for sacrificing much of his time to work on this build with me, and for him to let me use his workshop in his garage .

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post #15 of 113 Old 01-03-11, 10:32 AM
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Re: Mal-X horn folded?

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sub_junkie wrote: View Post
I only have one major problem...the panel that the sub mounts to is moving around on the back side of the box, and it creating some nasty noises while playing content.
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sub_junkie wrote: View Post
Got a nasty reflection off of the plexi, but you can still see it at least.

I think there's your problem... the driver baffle isn't braced either in the mouth or the throat and there's a window looking into both the mouth and throat segments, creating the distinct possibility for a leak between them where the window is and a corresponding loss of output. I'd at least get into the mouth and add some serious bracing, as well as permanently seal off using wood and PL premium the part of the window that looks into the throat (for extra strength). A smaller window that looks into the mouth area only should be ok.

It looks like a real beast... I'd hate to think that you're losing output to air leaks and panel resonances.
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post #16 of 113 Old 01-03-11, 11:06 AM Thread Starter
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Oklahoma Wolf wrote:

I think there's your problem... the driver baffle isn't braced either in the mouth or the throat and there's a window looking into both the mouth and throat segments, creating the distinct possibility for a leak between them where the window is and a corresponding loss of output. I'd at least get into the mouth and add some serious bracing, as well as permanently seal off using wood and PL premium the part of the window that looks into the throat (for extra strength). A smaller window that looks into the mouth area only should be ok.

It looks like a real beast... I'd hate to think that you're losing output to air leaks and panel resonances.
My uncle and I didn't even think about the sub baffle rattling around with how it was glued and nailed, but I had second thoughts about the side of the baffle showing to the plexi would be moving once this thing got some power to it. We are going to make some triangle braces to put on the sub baffle, and will silicone the sides very well, hopefully to stop that rattle as it is very loud, even when the sub is a low volumes.

The plexi is "sealed" to the box with weather striping, and we doubled up the weather striping where the sub baffle met with the plexi. So it Should...be sealed up somewhat, but I'm not confirming this yet. Once I get the light in to install behind the plexiglass, I will more than likely seal up the plexi for good, if possible.

I'll make sure we silicon basically every joint that we can reach. .

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post #17 of 113 Old 01-03-11, 11:28 AM
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Re: Mal-X horn folded?

Dylan,

What is the size off that box?

Also what kind off tuning was you aiming for with that again?

Looks good mate.

cheers

Graham
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post #18 of 113 Old 01-03-11, 03:28 PM Thread Starter
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Quote:
gperkins_1973 wrote:
Dylan,

What is the size off that box?

Also what kind off tuning was you aiming for with that again?

Looks good mate.

cheers

Graham
The volume of it I do not know after all the internal wood pieces are subtracted. But the external dimensions are 55" tall, and 44" or so wide and 20" deep. I'll measure again later today to make sure.

As for the tuning...I really don't know that either :P . Soho, Matt, and Ricci pretty much designed and folded this horn. I simply did the building of it. I'll try to run some test tones later to see if I can get a rough estimate of the tuning of the horn.


On a side note, about where should I set my HPF? Just around 12hz or so?

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post #19 of 113 Old 01-03-11, 05:20 PM
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Re: Mal-X horn folded?

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I think there's your problem... the driver baffle isn't braced either in the mouth or the throat and there's a window looking into both the mouth and throat segments, creating the distinct possibility for a leak between them where the window is and a corresponding loss of output. == I'd hate to think that you're losing output to air leaks and panel resonances.
The lack of extra bracing wouldn't allow that panel to move. That indicates the panels are not joined properly.

I see you used some small nails (brads?) but what adhesive did you use to bond the panels together? If it isn't holding there, you could have problems in the panels you do not see as well.

I also didn't realize you were going to place the p-glass across a baffle wall. You will need to add a few braces from wall to wall in the throat area where the p-glass is to hold the baffle in position there. I would then loose the weather striping across the baffle, and try plumbers putty. If the sub blows it out it will be easier to see. That gap seems to be ~1/4". If so, I would glue a spacer onto the baffle wall section there, to shrink the gap as well.


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post #20 of 113 Old 01-03-11, 05:22 PM
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Re: Mal-X horn folded?

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On a side note, about where should I set my HPF? Just around 12hz or so?
Anything between 10-15Hz will do.


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