Vision manual page:14
4. DELUXE MONO INPUT MODULE
The Vision deluxe mono input module is a basic input design whereby all signal flow takes place from the
microphone to the direct output as well
as to the main left right outputs and group outputs.
4.1 Input section
The input section controls all incoming signals from microphone and line inputs.
A +
48V
phantom power switch for condenser microphones or direct boxes can be silently switched in
or out of the circuit.
Phase
is used to reverse the phase of any mike input coming
from a mike or signal that may be out of phase with other mikes or signals. A successful method of checking
for out of phase signals is to pan the two input signals to the middle and listen closely to the mix. If an
unexpected sound is heard or if something appears to be missing from the mix, depress the phase
switches for those channels suspected to be in error. If the sound improves, then that channel was out of
phase with the others.
Line
switches the microphone input to line input on the channel.
The line has its own balanced input amp and is controlled by the active (dual) gain control.
When the
GAIN
control is accurately set, it is possible to achieve the very best signal to noise ratio and
maximum headroom required for high quality recordings. This control is for adjusting the
line
and
mic
inputs (with separate electronics), although only one knob adjusts the dual pot.
4.2 Equalizer Section
The 100 Hz
Highpass
filter is a fixed 9 dB per octave Butterworth model which reduces low frequency
noise effectively and musically. It can
be switched on or off in the channel path.
This four-band parametric equalizer is unique in its design. There are four bands, the high and low are
sweep able frequency with shelving characteristics with a boost or cut of 16 dB and the two mid bands
each sweep able with a boost or cut of 16 dB.
The
HF
(high frequency) section is a variable frequency shelving type,
sweep able
from 4,000 Hz to
20,000 Hz with a maximum boost or cut of 16 dB.
The
LF
(low frequency) section is a variable frequency shelving type, sweep able from 20 Hz to 500 Hz with
a maximum boost or cut of 16 dB.
The
HMF
(High / Mid Freq.) section has level and frequency controls with variable frequency ranges from
600 Hz to 15,000 Hz and has a maximum boost or cut of 16 dB. The bandwidth has a Q factor of 1.5.
The
LMF
(Low / Mid Freq.) section has level and frequency controls with variable frequency ranges from 40
Hz to 900 Hz and has a maximum boost or cut of 16 dB. The bandwidth has a Q factor of 1.5.
The
EQUALIZER can be switched in or out of the channel .
All level controls are center detented making
neutral positions easy to establish.
All frequency ranges have been carefully selected following extensive examination of all types of music (and
noise) which makes this equalizer a pleasure
to work with. Noise and distortion are kept to an absolute minimum.
4.3 Auxiliary send section
The Vision has eight auxiliary send busses. While in the tracking session, some aux sends are used for
feeding the headphones and some are used
for effects sends. During the mix session, all aux sends are used for effects sends.
Aux
illiary sends
1&2
are on dual concentric controls. The
top control is the send control for aux 1 and the bottom control is the send for aux 2. These Aux busses
are normally used for stereo
headphone sends in the tracking session. A PRE switch puts them pre fader for fold back purposes.
