Step 1- Choose the type of audio system you want.
Shelf System- Shelf systems are designed to fit comfortably on the average bookcase shelf. Typically, shelf systems include all the components of a full-size stereo system: CD changer, dual cassette deck, AM/FM radio, an amplifier, and stereo speakers.

Micro System- Micro systems are generally even smaller than shelf systems. They also feature sleek, contemporary designs that blend seamlessly with modern decor. Typically, micro systems offer a single-disc CD player, an AM/FM tuner, a built-in amplifier, and stereo speakers.

Clock/Table Radio- Smaller still than micro systems are clock and table radios. Some clock and table radios offer single-CD players, but all feature an AM/FM radio, an amplifier, and at least one built-in speaker. Many models add a second speaker, allowing you to enjoy the spaciousness of stereo music.

Step 2- Pick the options you might want to add.
Some systems offer auxiliary inputs that let you add sources to your system. You can add on cassette decks, MiniDisc players or the audio output of a TV or VCR. If you want to add a turntable and your system doesn't have a phono input, you'll need to get a phono preamplifier.