Eureka Microphone Preamplifier - Manual (Page 9)

CONTROLS & CONNECTIONS
9
2 . 2 P R E A M P L I F I E R
GAIN: Provides +52dB of gain for the microphone input and +44dB of gain for
the instrument input.
IMPEDANCE SELECTOR: Selects the amount of resistance that is applied to
the microphone input. This selector allows you to match (or intentionally
mismatch) the input impedance of the Eureka with the impedance of your
microphone. As the Eureka’s impedance is lowered, different filtering effects can
result delivering a tailored sound for a particular application.
SATURATION CONTROL: Selects the amount of increase (0% to 100%)
applied to the even harmonic series of the signal being amplified by the
EUREKA. The effect of manipulating the harmonic distortion is of increasing or
decreasing the apparent “warmth” of the signal. This feature is derived from
manipulating the drain current of the FET input buffer of the Mic Preamp.
Experiment with the SATURATION control and see what type of sounds you can
get from your present microphone selection.
LINE: Selects the line input on the back as the input in use. When using the Line
input, the microphone preamplifier stage is bypassed and thus the GAIN,
IMPEDANCE and SATURATE controls are inactive.
+48V: The 48 volts supplied by way of the XLR connector, provides power for
condenser mics and any other devices requiring continuous phantom power
through the XLR input. This power is supplied at a constant level to prevent any
degradation of audio quality.