speaker in high heels design
transmission line type loudspeaker enclosure for a full range driverFor your home
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A speaker system in a high heel shape. The enclosure is designed as a folded acoustic transmission line ( see "https://en.wikipedia.org/wiki/Acoustic_transmission_line" for physical details) to give low frequency support. It's not like a subwoofer but quite decent.
The pressure chamber behind the driver acts like a low-pass filter to reduce higher frequencies dropping out of the vent. It was made with blender and partly "handdrawn" as you can see at the different thickness in the course of the inner wall. Well, this imperfectness helps reducing housing resonances. :-)
Materials and methods
- PLA (around 300g including side cover, 28hours printing time)
- Speaker Visaton FRS8 (around 12€)
- Small foam stripes
- Wood glue
Print settings: standard with support and platform adhesion, but(!) strong 3D infill: octet type 30..40% infill rate (you can use "gyroid" infill as well, but it'll result in much more wave like printerhead movements)
Assembling (see pictures as well)
1. glue the speaker to the inner side of the enclosre (I know, screwing it is quite difficult to impossible, so you may leave the support material in the screw holes and put a drop of glue on it for sealing it)
2. thread the speaker cable through the opening in the backside and solder it to the speaker
3. put two small stripes of foam to either side
4. glue the cover to the enclosure
5. Enjoy :)
- 3d infill is important
- sealing the housing is important, every unwanted air hole weakens low frequency support. So take care of the cable entry as well. Don't be frugal with glue.
- There's a resonance at around 290Hz, therefore voices will be a little bit louder than at the rest of the spectrum. You can place a series notch filter (4.7mH, 68uF, 4.7ohms) in parallel with the driver to equalize this.
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