Related Clues:
- Big thing to haul on stage
- Box for blasting
- Bassist's booster
- Keyboard attachment
- Increase the intensity (with "up")
- Current measure shown by a member?
- Sound magnifier
- Concert volume booster
- Excite, with ''up''
- Bass player's accessory
- A mic might plug into one
- Electric bass accessory
- Band's sound booster, for short
- Unit of current, in brief
- Volume-boosting box