New and improved version of my Backpack-Boombox
A few month ago I started building a simple backpack-boombox for use at the Friday Night Skate event in Copenhagen. It was a huge succes to say the least. Unfortunately it was put together rather quickly and build using cheap MDF plate, so it is only a matter of time before it will see rain and slowly disolve.
The input is a line-out signal from iPad/iPhone/iPod.
The system is loud as hell and the sound quality when standing a few meters away is actually pretty good. The cabinet was build to fit into a old backpack but I think it ended up being around 15L, and is closed.
Before I start building the new version, using the same components, I want to be a bit more scientific about the box. So far I have calculated it in WinISD using 4 drivers, 16L, 65Hz tuning freq. and a vent diameter of 3.6cm and 1.8cm long. The box will be build using 9mm birch plywood, hence the 1.8cm vent
Here are a few screenshots of the simulation
The goal is the same as Saturnus' boominator. To have a peak around 120Hz and to ignore freq. below 100Hz as much as possible. Im completely new to WinISD so I would love to know if waht I have done so far makes sense.
This is what the old version looked like:
Interesting project. I'm interested in for slightly different aim.
How much does it weigh?
How do you manage to charge the battery?
So far the top can be removed in order to pull out the battery and charge it. This will be change in the new version.
It weighs a lot. I think around 10-12 kg. The weight will be dropped a bit with the new design, but I doubt we will ever get it below 8kg.
The only thing holding me back is the question about the boxsize and tuning frequency. Is it correct to chose a tuning frequency equal to the Fs of the woofers?
Ok, thanks. 16L it is then with a small'ish vent.
I wil update this thread as we go along. I hope this can serve as a nice smaller alternaive to the popular boominator.
look at WinISD diagrams and you can't go wrong
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