Shure SE420 - Manual (Page 3)

english
INSERTING THE EARPHONES
If the earphone seems to be lacking in low frequency response
(bass), check the tightness of the seal between the earphone and
your ear, or try one of the other sleeve options.
To change earphone sleeve, twist and pull sleeve to remove it from the nozzle.
Push new sleeve onto nozzle until you feel it slide completely over barb. If any part
of the nozzle is exposed, sleeve is not properly installed. Replace sleeves if they do
not grip the nozzle tightly
Warning: Do not push the earphone sleeve beyond the ear canal opening.
Nozzle Barb Sleeve Over Barb