CAMCO USER MANUAL
VORTEX POWER AMP SERIES
P.16
4.1 Precautions
Only connect this amp to the mains indicated on back panel sticker.
Note: Even under normal conditions the mains current can reach levels
(up to 80A / 230V); this could cause lamps to flicker if connected to the
same mains as the amp.
4.2 Controls
4.2.1 Volume Control
A microprocessor-controlled DCA (Digital Controlled Attenuator) with a control
resolution of 12 bits per channel is integrated into the signal path. This means
that the signal is not subject to an A/D followed by a D/A conversion with
associated losses. Each channel is governed by a linear potentiometer with 41
notched settings. These settings have been selected to correspond to human
hearing characteristics (logarithmically) and therefore guarantee an optimal
range of settings for practical applications. Each channel can be set individually
except when operating in mono mode whereby only ChA is active.
Using an intelligent DCA control (Digital Controlled Attenuator) instead of the
“conventional” VCA results in considerably reduced distortion (by as much as 20
dB) as well as improved noise characteristics (up to 3 dB). The implementation
is comparatively simple: the volume potentiometers pass the relevant control
information (quieter or louder depending on the adjustment made to the
potentiometers) to the microprocessor. The microprocessor then adjusts the
power amp output using various strategies implemented in software. In
addition to improved technical parameters, this approach allows a significant
reduction in the number of components and circuits required.
The volume pots are also used to set the CAI-address.
(See 5.2.3, CAI Address Settings)
4.2.2 Gain Selector
A switch on the rear of the
VORTEX
allows the maximum amplification
attainable to be set directly in the input stage.
The
VORTEX
amplifier has a 26dB and 32dB
voltage gain setting along with a 1.4V
sensitivity setting.
4.2.3 Limiter Switch
This switch is located at the rear of
VORTEX
. It allows you to set the mode of
the limiter. There are three modes:
Right position:
Clip Limiter: ON & Speaker Protect: ON
Middle position:
Clip Limiter: OFF & Speaker Protect: ON
Left position:
Clip Limiter: OFF & Speaker Protect: OFF
(See 4.4.1,Clip Limiter and 4.4.3, Speaker Protect Limiter)
4.0 OPER
ATION
GAIN
26dB
1.4V
32dB
LIMITER
OFF
SpP Clip
SpP
LIMITER
OFF
SpP
LIMITER
OFF
SpP
SpP Clip
SpP Clip
Summary of Contents for Vortex 2.6
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