For a strickly limited time you can get the Peachtree nova65SE amplifier and the Peachtree D4 book speakers in High Gloss Black from just $1699.
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As the name implies, the Packaged System includes at least the source and the amplifier, and usually speakers as well, and it can be all in one box. Then there are iPod based systems where there's a dock, amplifier and speakers, or increasingly these days, bluetooth or a wireless input method. In the full form the speakers are separate, such as in the Yamaha "shelf systems".