4
about This Manual
This manual is designed for software Version 3.0, and
should be used as a quick reference for owners of the
Custom Series 75 console, not to be read cover to cover,
but as an accompaniment helping you to get to know
your new console. Important terms can be found in bold
allowing you to skim through to the exact section on a
page that is relevant.
Terminology
Extensive use of terminology, of which we feel it
necessary to define before continuing, is used throughout
this manual. Make sure you are familiar with this before
continuing. The glossary located at the end of the manual
may also assist!
Module - To avoid confusion between a Channel and
the Channel path, 'Module' has been used instead to
distinguish the physical modules that contain both the
Channel path and Monitor path.
Daw - Digital audio Workstation.
Bus - A summing point for all signals routed to the same
place. All busses in the Series 75 are balanced lines to a
particular destination (e.g. ‘Stereo Local Mix Bus’ picks
up all signals routed from Channels and takes them to the
Main Mix).
Voltage summing - In the 1970s Voltage Summing was
the only way to sum multiple signals onto a bus. Put
simply, the signal level on the mix bus drops as more
signals are fed to it, typically to around -30dBu. Further,
the mix bus must be designed from the outset to have
a fixed number of sources, and the impedance and bus
level depends on this not changing. The signal passes
through an input transformer and amplifying stage – the
“mix amp”. This input transformer will subtly colour the
signal. Once the signal passes through the mix amp it hits
an output transformer. The output transformer is where
much of the sonic colour comes from. In effect, a Voltage
Summing Mix Bus colours the audio in a way that is
pleasing to our ear.
Current summing - Current Summing is a modern
solution to the 'deficiencies' of Voltage Summing. No
matter how many signals you feed to the mix bus of
a Current Summing circuit, the voltage on the bus will
remain at 0 Volts. We call this a "Virtual Earth" - the
inverted op-amp output voltage is 'fed back' to the virtual
earth point via a feedback resistor, resulting in 0V at the
op-amp input. A more sophisticated variant of this circuit
is used to achieve balanced virtual earth mixing as used
in this console. Due to the virtual earth, this design does
not require an input or output transformer. A Current
Summing Mix Bus does not colour the audio.
Quickstart
If you don't want to read the complete manual, you can
start with the most important sections below:
»
Installation:
http://www.customseries75.com/pdf/
health_safety_installation_connections.pdf
»
Power up Procedure:
http://www.customseries75.com/pdf/operation.pdf
»
Master section:
http://www.customseries75.com/
pdf/master_section.pdf
»
Channel strip:
http://www.customseries75.com/
pdf/2081_module.pdf
This will give you a starting point from which you can
come back and print out sections that you are interested
in.
Can I download the
complete manual?
Yes, the manual can be downloaded at http:www.
customseries75.com/pdf/customseries75_manual.pdf
