ORIGIN User Guide
Detailed Channel Description
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Detailed Channel Description
SuperAnalogue PureDrive™ CHAN (Channel) Pre-Amp input
ORIGIN’s pre-amp is a new wide gain range, ultra low noise SuperAnalogue design that provides both Line and Mic level
amplication by using a LINE gain range and input source switch to cover a wide range of source signals and levels.
The channel microphone input is via an XLR input on the rear of the console behind
the associated Channel strip. The line level channel input is via a DB-25 connector
also mounted on the rear of the console. Typically these inputs will be wired to a
Patchbay (see Appendix F). The XLR is the default source input, the source can be
switched to the DB-25 jack Line input by pressing the LINE switch on the channel.
The nominal Line Input impedance is 10 kΩ
The GAIN control adjusts either the microphone pre-amp gain (+2 dB to +70 dB),
or the Line amp gain (-12 dB to +55 dB), depending on the selected input source.
The Mic input’s nominal impedance is 1.5 kΩ and includes a
ø polarity switch and
switched 48V phantom power.
DRIVE switch
The DRIVE switch signicantly changes the character of the pre-amp and how it
reacts to signal level. The default ORIGIN mic pre is a very clean, linear design which
has no distortion up to the clipping point of the channel strip (approx +27 dBu). With
the DRIVE switch pressed the pre-amp becomes reactive to signal level and gain
settings. As signal levels and gain settings increase there is an initial introduction
of 2nd harmonic distortion artefacts, then at higher signal levels/gain settings this
adds increasingly more 3rd harmonic distortion components up to the clipping point.
These effects also introduce some compression to transient signals.
The DRIVE feature is evolved from SSL's acclaimed VHD™ (Variable Harmonic Drive) circuits. These are found in a range of SSL
products from our 1U mic pre's to our largest production consoles.
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