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I'm noticing the main DIY Sub section seems to be getting more traffic then where my Maelstrom-X 21"build thread is in the Exodus section. I just want to bounce some ideas/thoughts off the more experienced builders before I cap this box (probably a bit late for some things, but it's good to know regardless).
I've built many car audio boxes, but that was back in the late 80's early 90's. Subs have come a long way since then! My current box is a dual 10" folded horn based on the Decware Wicked One design...I built this about 10 years ago now! http://lonelyraven.zenfolio.com/img/v2/p573447152-4.jpg
So I'm figuring it's time for me to upgrade since the LJ Audio 10" drop like a rock below 30Hz, and I'm 95% Home Theater and 5% background music lately. So I let Kevin of DIYCable.com talk me into a 21" Maelstrom-X in a sealed box. He recommended a 12ft^3 box, but I was having fun with numbers and caught some plywood on sale, so I decided to go a bit bigger. I know I'm beyond the point of diminishing returns, but it's a fun build and should show results regardless.
The box (airspace) is 41" X 37" X 23" (those who paid attention in class will recognize these are primes). I made all the bracing asymmetrical, and they are also on primes. All the bracing is installed in the box at prime number spacing...(11" 13" 17" 19" 23" etc) making sure brace to brace spacing isn't evenly divisible, and I've added a band of bracing around the middle of the side panels which breaks the height into 11" panels. So my questions:
Does this look like enough bracing considering the size of the box?
I grabbed some "deep pockets" fiberfill pillows for the airspace, but I have some rockwool acoustic blankets I could put in there...would the rockwool help damp 1/4 or 1/2 wave internal resonance??
I saw Ricci's sealed test enclosures, and I had already planned on doing a removable (3 layers of 3/4 ply) baffle similar to his. But his boxes made me feel like mine was underbuilt. I just wanted to get more sets of eyes looking at the build before I sealed it up for good.
I'm open to suggestions!
I've built many car audio boxes, but that was back in the late 80's early 90's. Subs have come a long way since then! My current box is a dual 10" folded horn based on the Decware Wicked One design...I built this about 10 years ago now! http://lonelyraven.zenfolio.com/img/v2/p573447152-4.jpg
So I'm figuring it's time for me to upgrade since the LJ Audio 10" drop like a rock below 30Hz, and I'm 95% Home Theater and 5% background music lately. So I let Kevin of DIYCable.com talk me into a 21" Maelstrom-X in a sealed box. He recommended a 12ft^3 box, but I was having fun with numbers and caught some plywood on sale, so I decided to go a bit bigger. I know I'm beyond the point of diminishing returns, but it's a fun build and should show results regardless.
The box (airspace) is 41" X 37" X 23" (those who paid attention in class will recognize these are primes). I made all the bracing asymmetrical, and they are also on primes. All the bracing is installed in the box at prime number spacing...(11" 13" 17" 19" 23" etc) making sure brace to brace spacing isn't evenly divisible, and I've added a band of bracing around the middle of the side panels which breaks the height into 11" panels. So my questions:
Does this look like enough bracing considering the size of the box?

I grabbed some "deep pockets" fiberfill pillows for the airspace, but I have some rockwool acoustic blankets I could put in there...would the rockwool help damp 1/4 or 1/2 wave internal resonance??

I saw Ricci's sealed test enclosures, and I had already planned on doing a removable (3 layers of 3/4 ply) baffle similar to his. But his boxes made me feel like mine was underbuilt. I just wanted to get more sets of eyes looking at the build before I sealed it up for good.
I'm open to suggestions!