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Discussion Starter #1
This year looks to be the year of the 18" driver

This will be my construction and documentation thread


This will work with anything from a Dayton Classic 18" with a 240 watt plate amp up to the Exodus Audio Maelstrom-X on 3KW. The RSS390HF-4 and the BASH 300 look good. I'm personally thinking the eD 19Ov.2 on a EP2500 will be used in my build.


Every version should include some form of subsonic filter at ~10Hz, the PE and BASH plate amps are easiest, I can calculate the resistor values and post them. Once I get the EP2500 I plan on figuring out how to mod the filters, I will share that info



Proposed build:

24" x 21" x 36" hwd

Internal volume just over 6'³ @ ~10Hz, port area > 6" id.

The experiment is to get the low tune and useable response into the single digits while cheating the port resonance




This set of cut sheets is for a two cabinet build. You will need 4 sheets of 3/4" MDF


You need to make two #1, one #2, and one #3.



 

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Discussion Starter #2
UPDATE:

I have come up with a slightly larger design that features larger ports with an aggregate area >8"Id. The volume is also up around 6.375'³ the tuning should come in around 12Hz.

You will need a 1.25" round-over for the port bends and opening, it's available at MLCS.

Don't forget the 4-$2.50 pillows from Wal-Mart


The Shiva-X on a filter modded(easy to do) PE BASH 500 would be provide amazing deep bass response in this box.








Here is a 6'³ sealed vs old vs new comparison:


Raw response, no SSF or room gain added.

As you can see there is ~2dB more output on the low end vs the old design.

The response with the Maelstrom-X will still tend to be a bit lean in most rooms, but it has all the usable extension and articulation you could ever hope for. The system group delay factor (Sum of (GDxHz) is below 250 down to 15Hz.
 

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Discussion Starter #4
Here are the Cut sheets for the single cab build:


 

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Great thread, anyway to get the cut list down to 3 sheets?
 

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Discussion Starter #6
tundrSQ,

I do have a smaller version for 15" divers that is 3 sheets for 2 boxes.


But for this you could use 2 handi panels instead of the 4th sheet, to save some money. I just noticed Friday when I bought MDF the pricing for 4 handi panels is almost exactly the same as a regular 49" x 97" sheet.

 

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you have 6 braces (the long ones that create the port) in the drawing that are not included on the cut sheets... or did i miss them?
 

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I like those boxes. I am looking at getting 4 of the parts express tc closeouts. Maybe we could go with a box somewhat like yours if they model well.
 

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Discussion Starter #9

Quote:
Originally Posted by JaxLax /forum/post/13626800


you have 6 braces (the long ones that create the port) in the drawing that are not included on the cut sheets... or did i miss them?

Good point, I think there is more than enough scrap to get these cut.
 

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Discussion Starter #10

Quote:
Originally Posted by robertcharles /forum/post/13626927


I like those boxes. I am looking at getting 4 of the parts express tc closeouts. Maybe we could go with a box somewhat like yours if they model well.


Right,

like you would ever NEED another sub



Just busting your chops



You've not even got your BEAST running yet.


Your just hooked on MDF dust
........ Like me



Those TC colseout 12" are a sweet deal, 3= 4ohm load though.


Me, I like the 19Ov.2, as long as the params are not BS.


I ordered an 19Ov.2 this afternoon. So we shall see shortly.


I requested in the notes of my order that they include detailed TS params (including inductance) for both versions of the 19Ov.2 to be published in this thread along with the parameters I measure here. We shall see if there service/support is on the ball
 

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Just PM Mandos here at the forum, and he'll post the numbers in the thread.


Sorry, PM Chris Schempff or alexlindeman - I gave a different forum name.
 

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Discussion Starter #12

Quote:
Originally Posted by Kil4Thril /forum/post/13627454


Just PM Mandos here at the forum, and he'll post the numbers in the thread.


Sorry, PM Chris Schempff or alexlindeman - I gave a different forum name.

Kil4Thril,

Good idea. I'll invite them over while I'm at it




*****


Here is a preliminary of the in-room response I am shooting for. This would take into account a custom modded EP2500 filter section and room gain of 6dB per octave @30Hz. Most rooms have better gain than that. The rising response will be mostly eliminated by bass management, but this gives you the option to raise the X-over point for when you want to get lots of impact
.

I have a couple parametric EQ's already that will allow me to prototype this filter before I mod the EP2500. I am waiting to order the EP2500 until after I've got the sub completed, should take about a week.
 

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I am having such a good tim e building, just looking for more, but different.
 

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Discussion Starter #14
I have now inhaled enough mdf fiber to officially have "Woodboogers"





Hopefully I'll get the four holes router'd out in the braces and then it's on to glue up
 

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Quote:
Originally Posted by NEO Dan /forum/post/13633208


I have now inhaled enough mdf fiber to officially have "Woodboogers"

Being a carpenter for years, I know what you mean. If the respirator is too bulky, get yourself some decent masks at least. Almost all mdf is manufactured with formaldehyde resins. MDF particles are much smaller than standard wood dust, get lodged deeper in the lungs and potentially cause more damage.


In addition, enough long term exposure to plain, straight 'ole wood dust can be carcinogenic.


Enough with the scaring, it will be an irritant, headaches, asthma, allergies. I myself get sinus infections a few times a year.


And shopvacs help catch some of the dust, but it being so small, you need a 1 micron filter to catch it all, you end of just circulating it around...


I don't mean to sound like your mom or school shop teacher, but fact is they did know a thing or two...
 

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Discussion Starter #16
Kubbie,

I had a headache till just a couple hours ago. I used to get nosebleeds when I cut lots of MDF.
 

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Discussion Starter #17
Update,

eD shipped yesterday, yea.

It's about this far away:



I'm feeling a bit screwed though. I can't locate my Jasper Jig to cut the two holes in the braces:



I've got no real extra cash ATM so I'm gonna give a good look around before I bite the bullet and go buy another router that I have a Circle Jig for.
 

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You can cut the holes with a jigsaw..in fact I would NEVER use a router with MDF....maybe I'm a wuss....but its bad enough using a table saw with it.



Baltic Birch is your friend!!!!
 

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Discussion Starter #19
tundrSQ,

i have some Baltic Birch but I I'm more partial to MDF, that is the saw is more partial to it.


I found the Jasper Jig I had used it as a shim when I reassembled s squirrel cage fan from a HVAC unit. that was why I knew I had just seen it. I had been walking by it several times daily.


There was decent progress today: click on picture for slideshow



And my driver has left columbus and should be local within the next hour or so.
 
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Dan can you post the 15" table build.


Is it the same tune as this one?


I am looking to order a C15.1 from AE (supposed to be similar to the AV15) and was looking for build options.
 
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