Oxygen 7Oxygen 7 - VCA & DUCK INTRODUCTION
Pag. 11
6 VCA & DUCK INTRODUCTION
3 Analogies
The acronym VCA stands for Voltage Controlled Amplifier, an electronic device that passes audio signal with its
gain controlled by an external DC voltage.
Each mixer channel is fitted with several VCA devices which replaces the conventional fader and audio
switcher (MST/Sub routing, Stereo Mode switchers, etc) circuits.
No audio passes through the fader and the switchers, as it does in the non-VCA consoles.
One advantage of this is that VCA faders do not suffer from such severe noise and signal loss problems that
conventional faders may have when wear and tear causes the resistive surface to deteriorate.
The benefit is longer fader life, as the crackles and dropouts typical of the traditional audio faders are smoothed
out.
A VCA is quite simply a means of remote controlling multiple inputs using a single ‘master duck’ fader or a
master duck signal auto-generated. The “duck level” is the amount of attenuation applied to the input,
responding to a ‘control’ voltage. The ‘ducked’ signal may be adjusted between fully off (mute), and fully on.
Oxygen 7 has both manual and automatic ducking capabilities. It means:
1) the ducking circuitry allows any combination of MONO and TELCO inputs to duck (attenuate) one or
more of the remaining modules (Stereo, Mono, Telco or Sub). Auto ducking is triggered by signal
present at the selected input Modules (see DUCK MIX selection on MONO and TELCO modules).
2) the ducking circuitry allows an (external) master fader (e.g. the DJ Console) controlling the whole mix
of the channels where ‘duck’ control is activated.
In the first case, to allow automatic duck control, follow these steps:
a) enable DUCK MIX option on the MONO and TELCO Modules that will drive the Duck circuitry (see
Duck Mix Jumper in the Jumper bay setting - § 7.7)
b) press DUCK MIX switch on the MASTER Module. Release time for the duck circuit is adjustable from
0.5 seconds to 5 seconds. ‘Duck ratio’ is also adjustable. A duck LED will indicate that ducking is
occurring.
c) press DUCK switch on the modules to be ‘ducked’.
In the second case (manual ducking):
a) connect the ‘Duck Master’ potentiometer (e.g. the Axel Technology’s DJ Console) to one of the ‘Mono
Module Remote Interface’
b) press DIRECT DUCK switch on the MASTER Module
c) press DUCK switch on the modules to be ‘ducked’.
(19 pages)
(35 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals