![]() Systems, Mixers:all of these units will require the use of a preamp between themselves and a passive pickup. You should carefully read the technical specifications of your acoustic amp in order to see what it will do. Or it may indicate a maximum input impedance allowed of 20,000 ohms or less - which will handle magnetic electric guitar pickups but not passive pickups. High impedance in these instances may indicate an allowable impedance into the 2 or 3 mega ohm range - which will allow passive pickups to be used. Low impedance in these instances usually indicates that in this range the amp will handle an impedance of 1000 ohms or less - which will allow active pickups with preamps to be used. Many acoustic amps show a selection that may indicate the choice of 'high impedance' and 'low impedance'. This choice is quite often in the form of pushbutton on the amp's control panel. 'Acoustic' Amps: may or may not require the use of a preamp with a pickup and that will depend upon whether or not there is a special built in preamp section to that amp that specifically allows for the choice in plugging in either a passive (non-preamped) or active (preamped) pickup. ' Normal' Electric Guitar Amps: A passive pickup has an impedance of approximately 2 mega ohms (2 million ohms) which virtually all 'normal' electric guitar amps can generally handle without issue. ![]() These units will not generally work with passive pickups. Microphone Preamp - a device that may be built into P.A.systems and mixers that is designed to work with microphones. Preamp - A device specifically designed for use with piezo pickups that increases the signal strength and lowers the impedance of a passive pickup.Īctive Pickup - A piezo pickup with an attached preamp. Impedance - To simplify things as much as possible we'll say that impedance refers to the range in which an amplifying device can 'hear' a pickup plugged into it.
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