Related Clues:
- Volume enhancers
- Builds (up)
- Electric guitar attachments
- Some sound equipment
- Accelerates, as a motor
- Rock concert needs
- Concert boxes?
- Units of electric current, in short
- Guns, as a car engine
- Audio gear
- Rock band loudeners, familiarly
- Need them to plug in
- Plugged-in items
- Guitars' needs
- Electric guitars need them