SONOSAX SX-PR (by Gary J. Louie) - Manual (Page 2)

selects whether or not the batteries are recharged whenever external power is applied.
• Modulometer can be internally switched to VU or peak action, and to be "pre" or "post"
the headphone monitor section.
• Tape return levels and limiter activation levels are adjustable internally.
• DB9 type mini connector is used for the tape inputs (unbalanced) and for a set of main
outputs (balanced) that are in parallel with the XLR main output connectors.
• Headphone jack is a standard 1/4 inch stereo type, with tip wired as left, ring wired as
right.
All modules are constructed of custom aluminum extrusions and held together with a
frame system using 2mm hex cap screws. Secondary controls are protected by aluminum
doors with magnetic latches.
SX-PR Dual Mic/Line input module
Note: Sonosax 0 dB = +6 dBu (re 0.775 V) = 1.55 V
REAR PANEL
INPUTS - XLR-3 female type connectors, pin 2 high, pin 3 low, pin 1 ground as per IEC
standard. Active balanced, 10K, input impedance (20- 20kHz).
TOP PANEL
Mic Power switch - selects the type of microphone powering scheme available at the in-
put connector, or none. The proper switch position should be selected before
connecting the microphone. The switch has the following 5 positions:
OFF: No powering is applied to the input connector (Originally intended to short the
audio conductors together, this has been changed in production models. Functionally
equivalent to the DYN/LINE position.)
DYN/LINE: For dynamic microphones or line level signals. No powering is applied to the
input connector. For microphones, some gain will generally need to be selected, usually
about 36 dB. A normal line level signal will generally require 0 dB of gain to be selected.
T12: Provides microphone power as per DIN A-B; pin 1 is ground, pin 2 is +12 VDC, pin
3 is 0 V.
+12: Phantom power. Provides +12 VDC equally to pins 2 and 3 as per DIN standard.
+48: Phantom power. Provides +48 VDC equally to pins 2 and 3 as per DIN standard.
GAIN switch - selects the amount of gain in the input amplifier. A 12 position switch, with
10 dB increments from 0 dB to 30 dB, and 6 dB increments from 30 to 78 dB. This
allows exact repeatability of settings and matching between inputs. One should select
only enough gain to see the "OVD" warning LED on the front panel flash occasionally
on peak input signals. This allows the optimum signal to noise ratio, without distortion.
Generally, microphones will require about 36 dB of gain, line inputs will require 0 dB of
gain.
L.F. CUT - 80 Hz/LIN/120 Hz switch - selects a 12 dB/octave lo cut filter, 3 dB @ 80 Hz
or 120 Hz, or linear response (no filter).
MONO/STEREO switch and PAN control - the MONO position sends the input signal
equally to the stereo main channels. The PAN control has no effect in MONO. The
STEREO position activates the PAN control to allow panoramic placement of the input
signal between the stereo main channels.
FRONT PANEL
LEVEL control - controls the level of the (preamplified) input being sent to the stereo