Compact 3D Printed 2-way Speakers

These are small desktop speakers that were optimized for FDM 3D printing.

There were a few features that I focused on simulating, analyzing, and optimizing for the final product:

Waveguide Geometry
Diffraction and Dispersion Characteristics
Port Noise
Enclosure Resonances

For the waveguide , I utilized a waveguide generation software called ATH4 to iterate the waveguide geometry and test many different sizes and shapes using a BEM solver called ABEC3. The waveguide was included to exhibit smooth directivity from~3.5 khz-20khz. The waveguide is small, so it cannot affect the directivity much below 3.5khz, but the transition between the waveguide and enclosure shape was intended to lower smooth directivity cutoff.

The enclosure shape uses smooth transitions between the waveguide and front baffle, and large roundovers all over to reduce diffraction. As well, the minimal size of the front baffle should help to increase the directivity in the 0.8-3.5khz range where the waveguide directivity starts to falter.

I utilized a constant radius port geometry to optimize air flow. I did not complete CFD simulations of the pipe geometry, but I designed the port using lessons learned from others on DIYAUDIO. I would like to analyze the performance of the port with the physical prototype once it is completed.

To limit enclosure resonances, I conducted FEA simulations of the enclosure. As well, I will utilize damping panels on the internal walls to reduce the resonances. Testing of the prototype will reveal more details about the performance.