The MXL i.booster raises any low level input signal, such as those of microphones and electric guitar, to the audio input level of Apple personal computers. This compact, affordable interface is an essential tool for Apple home recording and multimedia enthusiasts. The electric guitar and cardioid condenser microphones (the microphone type used in professional recording environments) output a relatively low level signal. They need to be amplified to a higher level to be used effectively with Apple Macintosh computers—both the iMac™ and the larger Power Mac™ tower systems. The MXL iboost is an inexpensive alternative to using expensive mic-preamplifiers and guitar input devices.