Related Clues:
- Bandstand volume boosters
- Equipment for blasting rock?
- Electronic drum booster
- Band’s blaster
- It's back behind the backup dancers
- What a Fender might be hooked to
- Gear that helps the audience hear
- Device carried by a roadie
- Connection for 71-Across
- Music booster, sometimes
- Zhuzh (up)
- What a guitar cable might plug into
- Boxes for bassists
- Gear for guitarists
- Gear connected to loudspeakers