As I’ve already build my set of subwoofers, to help out my arrays with the bottom end extension, I might as well publish what I did, to maybe inspire others for a project of their own, or… one could simply copy mine.
I’ll show drawings with measurements (all of them in milimeter unless noted otherwise) that should fit well together. Please be sure to check your raw materials to be of equal thickness etc. You’ll need to adapt the drawings to the physical dimensions you have. I needed to adjust my own measurements to fit the raw birch ply panels I have used which were 18mm, not 19mm in thickness. You’ll see several pencil markings and notes on the pictures I show. I have finalized every dimension in practice. These drawings are a basic guideline, however it should all fit together when following these dimensions. Adjust to fit your own material stock and needs.
In this following series I will present the design, publish the drawings and show parts of my own building process. A lot more information can be found in my huge thread over on DIYaudio: The making of: The Two Towers. The first post has a couple of links to specific topics such as the subwoofers. On this site I will show the drawings with dimensions.
Let’s get started with the basics. In my room I have limited space. One of the reasons why I ventured into arrays. I also have a family and this means there will be limits to what I can do inside our living room.
If you recognise these limits, maybe a subwoofer project like this is just what you need. Like with the arrays, I will use processing (DSP) to get them to do what I want. A limited sized sealed enclosure would still need a bit of help from EQ. What I want them to do is help out the arrays, but also use the strength of each (array and subwoofer) to fight room modes. There will be room interaction from both, but like the drivers in an array work together to overcome this interaction, we can do the same with the subwoofers and arrays. We still limit the amount of energy going towards the arrays, but to make them play together and use each of their positions as strengths we can have a better sum than simply crossing them over.
Still in the workshop waiting for the next step (adding an amplifier):