Operating Manual

Fredenstein HD Reference Preamplifier
Controls and Operation:
Rotary Control:
GAIN : Gain Control from
0 to 64 dB in 1dB steps
Pressing the Gain Knob Mutes the output and the Gain Display Blinks
Output Peak Level Indicator: -18dB to +20 dB, 2 dB steps (0dB = +4dBu)
Switches:
P48 : +48 Volt Phantom Power when lit
POL : Reverse Output Polarity when lit
LOW Z 300 300 Ohms Input Impedance when lit
LOW Z 1K : 1000 Ohms Input Impedance when lit
With neither 1K and 300 pressed, the input impedance is approximately 200 Kohms
Note: With P48 engaged 200K becomes approximately 13 Kohms.
Low Cut 39 : reduces the lower frequency response to 39 Hz
Low Cut 82 : reduces the lower frequency response to 82 Hz
Fredenstein HD Reference Manual V1.0 Feb 5, 2016 Page 8