There are a few factors to consider when choosing wood for your DIY speaker cabinets. One important factor is the type of sound you want to achieve. Different types of wood can produce different tonal characteristics, so you'll want to choose a wood that will help you achieve the sound you're looking for. Here are a few options to consider:

* MDF (medium-density fiberboard): MDF is a popular choice for speaker cabinets because it is relatively inexpensive, easy to work with, and has good acoustic properties. It is also relatively heavy, which can be beneficial for reducing resonance in the cabinet.
* Plywood: Plywood is another common choice for speaker cabinets because it is strong, lightweight, and relatively inexpensive. It can also be finished in a variety of ways to achieve different looks.
* Solid wood: Solid wood can be a good choice for speaker cabinets because it has good acoustic properties and can be finished in a variety of ways. However, it can be more expensive than MDF or plywood, and it can be more difficult to work with.

Ultimately, the best wood for your speaker cabinets will depend on your specific needs and preferences. It may be helpful to experiment with different types of wood to see which one works best for your project.