Eureka Microphone Preamplifier - Manual (Page 15)

3 OPERATION
15
3 . 1 M I C R O P H O N E S
The Eureka works great with all types of microphones including dynamic, ribbon
and condenser microphones. Dynamic microphones and ribbon microphones
are generally lower output devices and require no external power source.
Condenser microphones are generally more sensitive than dynamic and ribbon
microphones and typically require external 48V phantom power.
Microphone Input Impedance
You can adjust the input impedance on the Eureka to match or “tune” a particular
microphone to achieve a desired sound. Most microphone preamplifiers have a
fixed microphone input impedance of 1000 to 2000 ohms. The Eureka has five
different impedance values to select from: 50, 150, 600, 1500 and 2500.
Refer to your microphone specifications to find the microphone output
impedance and experiment with matching the Eureka’s input impedance with the
microphone’s output impedance. As the impedance on the Eureka is lowered, a
resistive load is put on the microphone. This will not damage a microphone.
However lowering or raising the impedance can create subtle coloring and
filtering effects and can be a perfect solution for a particular application.
3 . 2 S E N D A N D R E T U R N
The EUREKA features ¼” TRS balanced Send and Return jacks. These
connectors allow the use of external processors such as reverbs, de-essers,
limiters, EQ’s, etc. Simply connect the send jack, balanced or unbalanced to the
input of the external processor. Then connect the EUREKA’s return jack to the
output of the external processor. The signal is now routed out of the EUREKA,