Wikipedia
Boombox
A boombox, also known as ghetto blaster, jambox, or radio-cassette, is a name given to portable stereo systems capable of playing radio stations and recorded music (usually cassettes and/or, since the early 1990s, CDs), at relatively high volume. Designed for portability, most boomboxes can be powered by batteries, as well as by line current.
Origin
Boom boxes were introduced commercially by various companies in the late 1970s, when stereo capabilities were added to existing designs of the radio-cassette recorder, which had appeared earlier that decade.
More powerful and sophisticated models were subsequently introduced. They are often associated with 1980s phenomena such as breakdancing and hip hop culture, having been introduced into the mainstream consciousness through music videos, movies, television and documentaries. It was during this time that the major manufacturers competed as to who could produce the biggest, loudest, clearest-sounding, bassiest, flashiest and/or most novel boomboxes. As the decade progressed, manufacturers tended to compete more on price (often at the expense of quality), and smaller designs (often designed for simple background listening) became more popular. This era was prior to the introduction and cultural entrenchment of the Walkman style, personal stereos with headphones which would later displace boom boxes in popularity.
Features
Technically a Boombox is, at its simplest, two or more loudspeakers, an amplifier, a radio tuner, and a cassette and/or CD player component, all housed in a single plastic or metal case, often with a handle for portability. Most units can be powered by AC or DC cables, as well as batteries.
Various boombox designs differ greatly in size. Larger, more powerful units may require 10 or more size-D batteries, may measure more than thirty inches in width, and can weigh more than 20 pounds.
Audio quality and feature sets vary widely, with high-end models providing featur read more at » http://en.wikipedia.org/wiki/Boombox