Everyone from recording engineers to home theater enthusiasts to hardcore audiophiles has a place in their life for a good pair of bookshelf speakers. Small speakers can deliver great imaging and fit into small spaces in ways that floorstanding speakers simply can't. The traditional bookshelf speaker is passive, meaning that you need to connect it to an amplifier. However, active (powered) bookshelf speakers are growing in popularity, particularly for desktop and other nearfield applications where you sit closer to the speakers. Combine a set of bookshelf speakers with a subwoofer, and enjoy a two-channel or multichannel system that is both room-friendly and high-performance. Here are some Resources that can teach you more about speaker design:
What’s the Ideal Speaker Driver Configuration?
How to Pick the Right Amp for Your Speakers (and Vice Versa)
Picking and Placing Your Display, Speakers, and Subwoofer by THX
First-Order Crossovers: Panacea or Problem?
How DSP Can Take Audio to New Heights