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Discussion Starter #1 (Edited)
This is my second build with the Mal-X and ED LT/1300 plate amp. The first was a 10.8 cuft slot port design that didn't turn out right so I rebuilt it. The specs are 22x22x44 plus another 5.5" for the base, Generation I Mal-X, Elemental Designs LT/1300 plate amp with 20hz hi-pass, 8" sonotube port tuned to 22hz. The walls are covered with two layers of 1/2" polyfill batting. I went with Rustoleum Mineral Brown stone finish paint so it would blend in with the living room furniture and it does a decent job of hiding seams and mistakes. The sub is in a 5000 cuft living room with openings and I'm using the Anti-mode 8033 for EQ. The output on this thing is amazing to say the least and I already want to build another one just like it. My HT partner in crime described it as "skull crushing". I'm proud of this build and thought I would share so others could benefit from it. I'll run REW over the weekend and post graphs as soon as I can. Here are the pics:
The pics are with my iphone because my real camera is broken so they're not the best quality.


Designing the bracing




Test fitting the port


Lining the walls with 1" of polyfill batting




Port installed with 1/2" roundover


Countersinking for the amp


Test fit




Port sealed and smoothed with caulk


Stone finish paint


Building the base




All corners have 3/8" roundover




The finished product-I'll get better pic and update as soon as I can


 

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hi there

I am curious as to why your slot ported didnt work out. I have 2 FI Q18 slot ported tuned to 13.5hz and they sound brill. What was it tuned to and is your new sub aimed more at music as I would personally tune a ported maelstrom much lower especially with its excursion capabilities. Smafrt build though.

cheers graham
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Discussion Starter #3
The slot build didn't work out because of a lack of knowledge and a bad design. I was running into over excursion for some reason and I never really figured out why. I tuned the slot build lower than the hi pass unknowingly (at the time) and I believe that was my biggest problem, other than it was just plain huge and took up too much room. The new build is for movies 99% of the time and my goal was high output due to my large room. After a lengthy discussion with ED, I learned that the amp basically rolls off around 18hz so modifying the hi pass (10hz was the only option) would have been pointless so I opted for a higher tune with more output. I went with the plate amp simply because I liked the plug and play aspect versus a pro amp. This build definitely exceeded my expectations and met my goals without a doubt.
 

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Hi there,

I forgot the ED plate amp has an 18hz roll off filter hence your tune. I love the effect you have put on the sub. Was that just a straight spray on job or did you have to do anything to get that effect.

cheers

Graham
 

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Discussion Starter #6
Hi there,

I forgot the ED plate amp has an 18hz roll off filter hence your tune. I love the effect you have put on the sub. Was that just a straight spray on job or did you have to do anything to get that effect.

cheers

Graham
It's straight spray. I tested it with primer and I couldn't tell any difference in the way the paint coated/dried compared to spraying directly on MDF.
 

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Yep I agree, looking forward to them. I found with my 13.5hz tune it is more like 11.5hz when running REW graphs. This should help me when playing 10hz stuff with excursion.

cheers

Graham
 

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That is very very very sweet.. I always try to sneak a jab when silicone is used instead of subfloor adheisive but it always seems to be in elaborite builds that i could never do. Too bad you didn't go for an 18Hz tune... I think it's a good tuning spot to begin with, that could have combined with your natural roll off... and too bad you brought the air space down...over excursion due to efficiency is never a problem in my book.. to me it means you get to turn the amp down and enjoy more headroom, more dynamics, less stress on your gear... more effortlessness.

But look at your pics... I should delete everything I said except " That is very very very sweet.. "

props
 

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Discussion Starter #10
Thanks for the compliments Ryan. I guess you lost me on the subfloor adhesive part. It's glued and caulked inside and out on all seams. I figure if I just have to find out, I'll buy another sonotube that will fit over the current port end to lower the tuning since I can easily reach it by taking out the amp. I'm sure it will happen cause like most everyone on this board, it's hard to leave things alone when there is the big "what if" factor.
 

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I am really loving that paint effect. I am here in the UK and would love to know where you can get some of that stuff in may be different colours. Have you got a link to where you got if from in the states so I could have a look please.

cheers

Graham
 

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Hi there,

What is your crossover set to because there seems a big dip between 50 and 80hz. It would almost look like you are set at 50hz because of the drop.



It does look great though.
cheers

Graham
 

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Discussion Starter #17
I don't know why I have that big dip. I disengaged the standing wave control on my Pioneer SC-07 cause it centered the frequency at 63hz with 6 db's of attenuation. It helped but it's still there for some reason. I guess it's due to the location of the sub
 

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Very likely have you tried other positions just to see if makes a difference. I have moved my spl meter literally a foot to the right and the measurement is totally different. Even small movements in position can make a big difference.

cheers

Graham
 

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Discussion Starter #20
Thanks Kevin and just so you will know I will have to have one more of these to compliment this build since I have apparently become a bass-head now.
 
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