The Clue Volume boosters
The Answer AMPS
The answer "AMPS" fits the clue "Volume boosters" because amps are a unit of electrical current that can increase the power in audio systems. When you increase the amps, you can make the sound louder, boosting the volume. In music and sound equipment, higher amps often lead to better sound performance. So, "AMPS" is a perfect match for the clue!