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CDA2
Description
The CDA2 Stereo CD preamplifier has been designed to partner ATC active, and
with an appropriate Power Amplifier, passive loudspeaker systems. It incorporates 2
line-level analogue stereo inputs on RCA phono sockets, together with a 3.5mm Jack
socket input, an internal CD Player system, 2 digital SPDIF Optical Toslink inputs and
2 digital SPDIF Coaxial inputs on RCA phono sockets. A main line level stereo
output on RCA phono sockets, true differential Left and Right outputs on XLR
sockets and a headphone output on a ¼” jack socket.
Selection of CDA2 inputs is achieved via an input push button mounted on the front
panel, the selected input being shown in the display window. Output volume is
adjusted by a precision motorised potentiometer. Standby is accessible by a push
button on the front panel, and is indicated by a red LED above the button. Above
the input selector switch is another red LED to indicate that the output has been
muted.
Mains power is applied from a rear panel mounted push button.
Inputs
The CDA2 will accept unbalanced RCA phono
style input plugs on Analogue inputs 1 and 2.
Analogue input 2 will also accept a 3.5mm stereo
jack plug. The signal on unbalanced phono inputs is
present on the centre conductor and the signal
return is made via the screened outer. The ring of
a 3.5mm stereo jack input plug carries the right
channel signal, the tip carries the left channel and
the body is the signal return for both left and right
channels. If there is any hum present on the output
this must be traced to its source and not suppressed
by the removal of screens and earths. Removal of
the screen on an unbalanced input will result in
uncontrollably loud hum.
Connection to the Digital Inputs can be either
Coaxial via RCA phono style input plugs or Optical
via Toslink connectors.
The input sockets are illustrated in Diagram 1.
CDA2
CD Player & Preamplifier
Diagram 1 - CDA2 rear panel and connection sockets
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