Quarter Wave Box Calculator 21

It is actually considered a quarter wavelength box and the port is roughly 7 feet long. The port area had. Posted on Wednesday, November 04, 2009 - 16:21 GMT. Is this formula the same weather its a 6' - 18' sub.

A few months back, I went into a big box consumer electronics store and wandered back to the elite section. Curious about the fuss, I asked the man to play some music through a pair of fancy $2000 speakers. I had no idea that music could sound that good. As any DIY person would do, I looked closely at the construction and materials.

It was top notch, shiny, well-finished--as expected for the price. Hmmmm.this was just lacquer or veneer covered CNC'ed MDF (Medium Density Fiberboard). As I have a CNC machine at home, I searched the internet.

I was surprised at the extensive resources available to build custom speakers for 10 cents on the dollar. This might be doable. First, a shout out to noahw and his instructable. I think that's the first link I found after visiting the big box store. That got me started with the online resources I needed. My goal here is to complement his resource and demonstrate how to design your own bookshelf speakers; specifically, how to use Sketchup and a CNC machine (or power tools) to design and build a better set of bookshelf speakers. It's a logical step to imagine using these skills to build a full size house-shaking, mind-blowing, floor-standing set for your home theater.

You could build a wooden box, cut some holes in it, drop in the speaker drivers and make a visually pleasing enclosure. You might get lucky, and it will sound great. However, without taking into account the technical details and specifications of a particular driver or driver set, you'll have no way of knowing if your box sounds the best it can sound. My goal here is limited.

I am not going to wind my own crossovers or get into the weeds about how to break down which frequencies get distributed to which driver. I am going to start small. I do have my mind set about building a full size house-shaking, mind-blowing, floor-standing set eventually.:) The amount of technical expertise, knowledge, and opinion available is astounding and intimidating, but you have to start somewhere.

This is where I started. Your constructive comments are welcome. I will update my instructable as needed. My goal is to build a nice computer or bookshelf speaker set with a small amplifier. I want to build speaker enclosures with a nice set of drivers that expose some of the fine details and texture of good music without being too shrill or too boomy. This project did not happen in one fell swoop.

I made lots of calculation errors, ruined a bunch of MDF and redesigned them multiple times. I still don't know if I got it right. But the process is part of the fun. For this project, I have released my files, but if you want, design and build your own with your own specific drivers. With respect to the tools that you have access to, you may need to design your enclosures differently.

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