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Audio Sources/Source devices
These are the components of your HiFi system and
all other appliances, whose sound you want to hear
over the system and are thus connected to the
preamplifier, amplifier or receiver. This includes
CD players, DVD players, tuners (radios), cassette-
players, DAT recorders, personal computers, record
players, portable audio devices and many more.
Input sensitivity
Term for the smallest average (RMS) input voltage
which causes the maximum output power at the ma-
ximum volume setting on the amplifier. Examples: 100
mV to 500 mV (Millivolts) on line level inputs, 2 mV to
5 mV on the phono MM input or 0.1 mV to 0.5 mV on
the phono MC input.
dB Level
This is a way of describing any physical quantity; it is
a common measurement for signal voltages and the
volume. It is given in decibels (dB). Alternating signal
voltages below 1V (RMS) are described as "line le-
vel" voltages, which are suitable as music signals for
amplifier inputs. Inputs on amplifiers (mostly represen-
ted by RCA sockets), which are designed for signals
on the CD player, tape recorder, DVD player etc. are
also referred to as "line level inputs". Those signal
inputs must not be confused with inputs that accept
preamplified signals.
GLOSSARY
RCA
RCA is the American name for a type of coaxial
connectors and sockets, originally the abbreviation
for "Radio Corporation of America", the name of
a United States company. Both the plug and cable
consist of a rod-shaped inner lead and a cylindrical-
shaped outer lead. This enables a mono audio signal
or a video signal to be transmitted. Compared to the
XLR plug connector, this type of connection is also cal-
led "unbalanced signal connection".
Dynamics
The volume difference between the quietest and the
loudest sounds possible in audio signals, without dis-
tortion or transition to noise.
Output impedance
Term for the AC internal resistance of the driving
signal source, here the preamplifier. The output
impedance of the signal source typically should be
significantly lower than that the input impedance of
the power amplifier. Exception: For power amplifiers
with transmitter input an impedance matching to 600
ohms is advantageous. Since between preamp and
power amp the connection should be done via coaxi-
al shielded cables for the best possible reproduction
the output impedance should be designed so that the
connected cables do not have disturbing influence to
the signal transmission. Typical cable impedances are
50 - 75 ohm. The output 2 of the SA-T7MK is desi-
gned optimally for this cable types.
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