Buzz Audio essence optical compressor - Manual (Page 2)

- 2 -
1] Compatibility and Power
The Essence compressor module is designed to be
installed into an API™ 500 Series compatible rack and
cannot function stand alone, requiring the power
source supplied by the rack system.
It should be noted that the Essence module consumes
more power supply current than most other 500 series
modules due to the True Class A amplifiers used in the
design. For this reason, there may be limitations on how
many Essence modules can be installed into some
older rack systems.
The current consumption of the Essence is rated at 120
milliamperes at +/-15 volts DC. If 5 modules are
installed into a 10 space rack, then a total of 600 milli-
amperes will be required from the rack power supply.
Most currently manufactured racks will easily meet this
requirement but if in doubt, please check with the
manufacturer of your particular rack.
For more information on the API™ 500 Series racks and
the VPR Alliance, visit the API™ website at
www.apiaudio.com.
- 3 -
2] VU Meter Cal Option
Before installing the Essence into your 500 Series rack,
you may wish to change the 0dB reference of the front
panel VU meter. This can be set to read either +4dBu
(VU meter standard, LINK OFF) or +14dBu (as supplied
from the factory, LINK ON).
The +14dBu setting is useful if the Essence is feeding a
digital work station, as the levels will generally be higher
than working with an analogue tape recorder.
Locate the LINK at the top left hand side of the outer
circuit board behind the DRIVE control and remove or
replace the link as required. No other adjustment is
needed.