My friend made is own speakers almost ten years ago and they are still going strong! On his iMac he connects it to older receiver connected to his home built speakers and it sounds great!
Speaker building unlike amplifier building is a bit of a Black Art. You have to either replicate a proven design or just accept you will need to build multiple interactions of prototypes and try out lots of ideas and parts. It can be a fun project but DIY designs don't save any money. Building someone else's design is the way to start.
But you need a big shop to build even a little speaker. You can build electronics on a table top