Cube boombox

[spotke]

Hi,

I've been wanting to build my own set of 12V portable speakers for quite some time now, and after I found this forum it seems like it's finally coming together! So thanks alot for the valueable information that's scattered throughout the many interesting threads.

The boombox that I'm trying to design / build is small and portable. Since I go everywhere by bike, it should easily fit in a backpack and be light enough to carry around. For the speakers I ordered 2x Monacor SP60 / 4ohm and 2x ND16FA / 6 ohm tweeters. This is a cheap combo, which was recommended alot in the different threads I read. I will be going for a sealed box, since it will be smaller and I don't need to worry about any debris getting into the boombox.

The part I'm having trouble with is the overall layout of the boombox. A cube would seem nice to carry around, and being 20cm * 20cm * 20cm, it should fit easily in any backpack. Subtracting the battery and drivers from the volume, each driver will have 3l which according to AjSealed gives a nice frequency response. However to me it seems like the shape will interfere with the sound quality of the boombox. However, TDK made a speaker much like this, so hopefully this won't be a problem? TDK-Boombox-Box.jpg I really like this shape, because it will give the speaker a sleek look, and be comfortable to handle.

If this shape interferes alot with the sound quality, I'll go with a tried and proven rectangular design. With this design I ran into a design problem too... Placing the battery vertically will allow me to make the box smaller (since the battery won't hit the drivers), but it will obstruct the path between the speakers. I read on the forum that with a sealed design you would want both speakers in the same enclosure, so this might be a problem when the battery almost divides the shared enclosure?

So in essence I'm struggling to choose between 3 options, of which I have attached sketches to make them a bit more clear. I would love to hear your opinion about this!

Note: I / the group that will be using the speaker isn't exactly audiophile. We use some logitech portable speakers, which we quite enjoy. But louder with a bit more kick to it would always be welcome . But I would find it a waste if I screw up the drivers' sound quality potential by making the wrong design decision.

[V-bro]

Square is less good as rectangular, as it will have more diffraction problems. That's still marginal though, as we are not speaking about high class hifi here...

Then why would copying the TDK speaker shape be a problem? As long as you're not selling them as copies it'll never be a problem.

Dividing the box almost 100% is not a real problem, as long as the total content is still correct and there are no bad reflections to the battery internally (put some felt over it or something the like)

Would love to see your step by step process!!

[spotke]

Thanks a lot, V-bro. This was the answer I was looking for .

Copyright or something like that was never an issue, I was just thinking about the sound quality. But if the cube shape is only a tiny difference in sound quality (For this use), then the cube shape more than makes up for it in usability.

I will definitely take some pictures during the building process, and post some autocad inventor models! It's the least I can do for all the helpful information that's brought together here .