The Economy Of Speaker Design

When you build your own speakers, you don't have to worry about poor quality.

Large speaker manufacturers build lots of speakers and some design decisions are based on cost, not sonics. Due to this fact, building your own can deliver much better results (because you're not building 1000, or 10,000 pairs of speakers, you can be more choosy when it comes to crossover components, speaker enclosure materials, and speaker driver selection and you can put more time into assembly). As a DIY'er, you are not tied to certain suppliers (you can mix and match tweeters and woofers as you see fit, and tailor the speakers to your liking). Why not get what you want and deserve?