Originally Posted by ThirtyOver
Have noticed that for some strange reason whenever I plug my Bass into the Active input (padded -20) on my Acoustic B200 head.....it sounds like flat out nonsense. Distorted garbage that I would not want to subject any party goer to. My bass is equipped with EMG 40px and Dcx pickups....P in the neck D in the bridge positions.
It is my understanding that the difference between a Active and passive input is a simple decibel cut for the supposed "power" of an active bass. If this is the case It should only be quieter, not fubar'd to hell.
Not that im that concerned cause it sounds fine using the passive input...but I do intend on a better Amp in the future and wonder If im gonna run into this same issue with every split input amp or is it simply crap material used by Acoustic?
Kinda believe that a good amp wouldn't need split inputs anyway.
No, the difference is that active pickups and passive pickups with in-bass preamps are low impedance and passive basses are high impedance. The passive pickups are completely exposed to the loads you put on, the capacitance of the cable and the input impedance of the first active stage (e.g. your preamp).
A specialized input stage for active basses will be very low impedance and hence can only be used with low impedance basses. Connecting a passive pickup will at least completely kill the resonance peak, making it sound dull.