Produce a wide range of quick sketches, using blue pencil, and possibly fine line pen some of your ideas to make them stand out. These should be fast, quick sketches, using a mixture of 2D (Symmetrical sketching) and 3D sketching techniques (2 Point Perspective) to communicate your idea. Try to avoid 'novelty' designs and think about stylish products, and also try not to just design a 'box'.
An A3 sheet of rendered design ideas (minimum of 4 rendered ideas) for a speaker (and amplifier)
At least one model (more is better) - small 1/3rd to 1/5th scale models (card, foam, foam board) of your speaker designs to include on your development sheet.
The development of one of your design ideas as a final design proposal, using sketches, 'Procreate' and your test models, ready to be modelled accurately in Onshape.
Below is a video demonstrating how you can sketch a triangular form using a 2 Point Perspective box as a starting point.