CONTROLS & CONNECTIO NS
9
2 . 2 P R E A M P L I F I E R
GAIN:
Pr52dB 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
