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1.0 INTRODUCTION
The SPX20 is a six input stereo source selector designed to extend the
number of inputs and range of monitoring facilities available on a typical
mixing console. However the SPX20 is suitable for a wide range of
monitoring applications including tape dubbing, audio-visual and digital
workstations and for installation in background music applications.
Each of the inputs on the SPX20 has a level trim with sufficient range to
cope with +4dBu and -10dBV equipment and for balancing the levels
between the different sources. Inputs are selected by momentary action
buttons which also allow more than one input to be selected at a time.
Multiple inputs are mixed (summed).
Two separate outputs with level controls and on-off switching provide a
means of selecting and balancing levels between two types of monitor
speakers or alternatively to add a 'monitor mix to studio' facility to your
mixer. The outputs have relay switching which is delayed at power on to
prevent annoying and potentially dangerous thumps and clicks reaching
your monitor speakers. The output section also has an overall Balance
control, Mono and Dim switching.
The SPX20 also has a built-in headphone amplifier with separate level
control and front panel accessible connector.
Main features of the SPX20 include -
• Six stereo inputs with level adjustment
• Momentary action input select with led indicators
• Front panel accessible insert and level adjust for Input 1
• Mixing of multiple input selects
• Balanced and unbalanced inputs on XLR, 1/4" TRS jack and phono/RCA
connectors
• Output Balance, Mono and Dim
• Two separate outputs with level control and on-off switching
• Power on-off output relays
• Tape record output
• Headphone output with level control
