A TWEETER is a small speaker that produces high-frequency sound waves, typically used in stereo systems. It is usually made of a thin material such as paper or metal and is seven letters long. A RECEIVER is an electronic device that receives audio and video signals from a source, such as a radio or television station, and amplifies them for playback. It is eight letters long. A turntable is a device used to play vinyl records, which are discs with grooves that contain audio recordings. It is nine letters long.