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