gml gml2020 Manual De Usuario

A.  The Gain control switch sets the amount of gain or attenuation for the input section in precise 5dB

steps from -10dB to +70dB.  This is a GML-specified custom precious-metal contact rotary switch.

B.  The Phase switch determines the phase/polarity of the selected input signal, while its associated

Green LED indicates the state of the Phase relay (Off for in-phase, On for out-of-phase).  No audio
signal is present at this switch.

C.  The Phantom switch allows the application of 48V-phantom power to pins 2 and 3 on the Mic input.
D.  The Filter control is a 3-position precision rotary switch used to select the high-pass filter mode of

operation: 100Hz roll-off, flat, or 40Hz roll-off.

E.  The Routing switch provides unparalleled flexibility in determining the operation of the Model 2020.

Routing options available on this precious-metal 5-position rotary switch are discussed in the
Operation section of this manual.

F.  The Cut/Boost potentiometer controls the amount of gain or attenuation for each EQ band. The

potentiometer element is precision-trimmed carbon film, for highest signal integrity and longest life.

G.  The Clip/OL LED provides an indication of internal overload for both the EQ and Dynamics sections,

regardless of routing option.  This red LED is triggered at +24dBu--several dB below actual clipping.

H.  The EQ IN switch toggles between the active and bypass modes of operation.  No signal is present at

the switch; it merely controls a high quality signal relay located near the back of the unit.

I.  The Dynamics IN switch toggles between the active (switch in, lamp ON) and bypassed (switch out,

lamp OFF) modes of operation.  Only a DC relay power signal is present at this switch.

J.  The Ratio LED's indicate an approximate compression ratio based on the soft knee characteristic,

with compression ratio increasing toward the left.

K.  The multi-segment VCA meter gives an accurate reading of the state of the VCA.  Not a gain

reduction meter, it displays both gain and attenuation based on the control signal applied to the VCA.

L.  The Detector LED's indicate which of the three independent detectors is active.
M.  The Link switch facilitates the interaction between multiple Dynamics sections of other Model 2020's

as well as Model 8900's.  No signal is present at this illuminated pushbutton switch.

N.  The Input Meter gives visual indication of signal level at the output of the Input section.
O.  The M/I input jack furnishes a convenient unbalanced high impedance input to the Model 2020.
P.  The Input Source switch, a 3-position rotary switch with precious-metal contacts, determines which of

the three inputs are routed to the Input section of the Model 2020.

Q.  The Frequency/Q potentiometer determines the center frequency and Q-factor for each band.

Frequency ranges differ for the bands to accommodate maximum flexibility, while each concentrically
mounted Q control ranges from 0.4 (wide) to 4 (narrow).  The inner numerical markings denote center
frequency and outer markings delineate Q value.  Carbon film is the element of this potentiometer.

R.  The Threshold potentiometer behaves as discussed in the Operation section of this manual.
S.  The Timing control is a dual-concentric potentiometer, with the Timing actuator on the outer ring and

the Release Hysteresis control on the inner knob.  The outer numerical markings denote the amount
of hysteresis, while the inner markings denote the Timing setting, in milliseconds.

T.  The Crest Factor potentiometer is dual-concentric and independently controls the Fast (outer) and

Peak (inner) Crest Factor settings, as described in the Operations section of this manual.

U.  The Ratio control, mounted concentrically within the Output potentiometer, acts independently to

determine both the mode of operation (Soft vs. Hard Knee) and the ratio of the Hard Knee. The
Output potentiometer provides a range of -6 to +14 dB gain in the output buffering stage.