The term "ghetto-blaster" is an outdated and potentially offensive term for a portable stereo system. There are many different words that can be used instead, depending on the context. A few possibilities include boombox, portable speaker, sound system, or mobile music player. Each of these terms carries a slightly different connotation, and can be used to describe a variety of different types of audio equipment. Regardless of which synonym you choose, it's important to be respectful and avoid using words that might be offensive or derogatory to certain groups of people.