Originally Posted by abarson
Looking for someone who's actually worked on the guts of bass amps.
Amp inputs seem to fall into three categories:
- One high Z jack, one low Z jack. Example: Epifani UL, Tubeworks RT-3300.
- One jack, with a high/low Z selector. Example: Genz GBE, Orange Terror Bass.
- One jack to rule them all. Example: Ibanez P500H, Eden WT.
For the last type, what are amp manufacturers typically doing with the input impedence? How do they accommodate the disparity between passive and active electronics?
Most inputs have high enough impedance that there is very little impact on a passive instrument, and active instruments basically are not impacted by the input impedance.
Piezo's are typically buffered through some sort of preamp, and hence don't need any special impedance either.
Zero issue. At most, an input pad MIGHT be helpful in the unusual case of a massively hot output instrument, active or passive.