Related Clues:
- Rock concert devices
- Concert blasters [#UniversalXwordPride]
- Sound magnifier
- Concert volume booster
- Sound-blasting boxes
- Boosters for 1-Across
- 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
- iPod part
- Box for a rock band