Cdplayers

3 clues
400 athletes?
Sound system staples
Contents of some music cabinets
Similar answers:
Allayers
Assayers
Ayers
Ayersrock
Ballplayers
Baseballplayers
Bassplayers
Bayersager
Bestinprayers
Billiardplayers
Binplayers
Bitplayers
Blairsprayers
Brayers
Bricklayers
Bugsprayers
Cardplayers
Cassetteplayers
Cdplayer
Cdplayers