DUAL TRANSFORMER MIC/DI PREAMP
FULL/FOCUSED: Selects between mic input transformers
with turns ratio of 1:5 (Full) or 1:10 (Focused).
1500/10K: Changes the load impedance seen by the microphone,
which can change the tone and overload characteristics of the
DI INPUT: Selects between Instrument (10M at the front
1/4" jack, 1M at the rear jack) and Line (100K with a -20dB
pad at both inputs).
MIC/DI: Selects between the MIC input (via the XLR
input connector) or DI input signals (via the front or rear 1/4"
+48V: 48 volts to the XLR input for mics requiring
0/-20: Inserts a 20 dB pad (40dB if DI switch in 'Line'
position) in front of the mic input transformer .
+/-: Mic phase reversal switch. Normal phase is XLR
pin 2 hot.
LO CUT: An 18dB/octave low frequency rolloff at 75
or 150 Hz.
GAIN: +33 to +63dB (Full/1:5), +40 to +70dB (Focused/1:10),
+20dB to + 50dB for the DI instrument input, and 0 to +30dB for
the DI line input, in 3dB steps.
OUTPUT: Controls the output level of the preamp stage.
By increasing the Gain and lowering the Output level, the sound
of the preamp can be varied.
HI Peak: up to +20dB (bandwidth-dependent) from 0.8-18
MID Dip: up to -20dB (bandwidth-dependent) from 200-800
LO Boost/LO Cut: up to 20dB shelving from 20-120 Hz.
EQ - µ / µ - EQ: Places the EQ before or
after the compressor.
PASSIVE/AGGRESSIVE: The Aggressive mode increases the
saturation of the EQ circuit to add harmonic content.
THRESHOLD: Up to 15 dB of compression is possible.
OUTPUT: Off to +15 dB of gain make-up after compression.
MODE: There are five modes of compression: Fast, Faster
(both peak-averaged), Vintage (program dependent attack and release
times), Average (rms detection), or manual (attack 1-100ms, release
SIDECHAIN LO CUT: Reduces detector sensitivity below
CEILING: Determines the maximum output level for peak
JFET/MOSFET: Selects the mode of FET peak limiting.
Note: All four elements are independent and
may be patched out and used separately.