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Architects & Engineering Specifications
The stereo preamplifier shall provide low-noise, low distortion preamplification, switching and signal
processing for permanent installation or sound reinforcement applications. The preamplifier shall have 3
MIC inputs and 3 stereo line level inputs (1 balanced, 2 unbalanced). Out of the 3 stereo line level inputs,
one pair shall be a balanced input via TRS socket (AUX 1) and the remaining two pairs shall be unbalanced
inputs via RCA socket (AUX2, ALARM) . Out of these inputs, one pair shall be a priority input (ALARM) which
shall override all inputs. MIC1 is 2nd priority input which gets priority on rest of the inputs (except ALARM)
provided that the MIC1 PRIORITY switch is depressed (accessible from the rear panel).The line level inputs
shall be switch-selectable (AUX1/AUX2) provided on the front panel. The MIC inputs shall have individual
level controls. There shall be a mixing control to control the relative signal strength between MIC and LINE
inputs. The preamplifier shall feature a Baxandall type bass - treble control and a master volume control
together with a balance control for left and right channels. There shall be a mode switch on the front panel
to switch between mono and stereo mode. All MIC inputs shall be female XLR type and all balanced inputs
shall be TRS type. All unbalanced inputs shall be RCA type. Pin connections of XLR and TRS type shall
conform to international standards.
The preamplifier shall have 2 stereo outputs out of which one is a balanced output via TRS socket (L&R)
and a unbalanced output via RCA socket (PREOUT).
The preamplifier shall be a Class I equipment with a 3-pin molded plug to suit 230V AC outlets. Switching
off power shall be controlled by a front panel mounted rocker switch with an LED power-on indicator.
Protection shall be provided by a rear panel mounted glass cartridge fuse and fuse holder.
The preamplifier shall be the SONODYNE model SC 2311.
SC 2311
