Related Clues:
- Band's sound-boosting box
- Gig hookups
- Critical measurements in "Apollo 13"
- Critical measurements in 'Apollo 13'
- Mic enhancers
- Item on a concert stage
- Excites, with "up"
- Rock guitarist's need
- Woodstock stage gear
- Bit of dance club equipment
- Energize, with 'up'
- Stage flankers
- They pump up the volume
- Hookup at a concert
- ___ up (intensify)