+1 pour doomy, qui, en plus de supputer a raison
et +1 pour niko, y'a bien une question d'impédance, voila ce que j'ai trouvé sur la doc de mon ampli:
PASSIVE - Higher sensitivity, high impedance input (125mV/4.7MO). For bass instruments that do not have active electronics, suited for older ‘vintage’ basses. This setting is precisely matched to high impedance pickups enabling them to faithfully reproduce the true frequency and dynamic range of the instrument.
ACTIVE- Lower sensitivity input setting (300mV) for basses with onboard electronics. Input matched for low signal to noise ratio and optimum transfer of electrical signal from modern high-end basses.
Donc s'il y a une entrée ou un switch actif/passif autant l'utiliser...