Dominant sound freq. [Hz], mid range
Silon (20 den) on the circular grille (7 V)
369,713
Silon (40 den) on the circular grille (7 V)
369,713
Foam dust filter (7 V)
339,028
Hexagonal grill (7 V)
339,028
No obstacle (7 V)
339,028
Plastic dust filter (7 V)
339,028
Circular grille (7 V)
201,587
Nylon dust filter (7 V)
201,587