I made this concept back in fall 2008. I had to design a low-end pair of computer speakers with a target price of only $10 to replace the current model made by Kinyo.
The sketches were drawn with a blue pen.
The production-ready 3D model and the technical drawings were made on Solid Works.
The render was made on Bunkspeed Shot more recently.
The scale model on the bottom right was sculpted in Renshape high-density foam. It was then painted with Krylon spray paint. The fabric-covered front is a sheet of polystyrene that I vacuum-formed over my Renshape model. I then covered it with speaker fabric and glued it to the painted model.