T+A A 1560, Руководство пользователя

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Wiring variants
Bi-Wiring
(see Appendix A 3 )
The term Bi-Wiring refers to an alternative method of
wiring up loudspeakers, in which separate speaker leads
are used to carry the signals for the bass range and the
mid-range / high-frequency range.
This system can only be used if your loudspeakers are
fitted with bi-wiring terminals. It is essential to remove the
bridging jumpers at the terminals.
As the example wiring diagram shows, the unit is
designed so that you can use the optimum type of cable
for each frequency range.
Bi-Amping
(see Appendix A 3 )
Bi-amping involves the use of two separate power
amplifiers, and they must be carefully matched, i. e.
amplification factors, phase response and relative phase
must be absolutely identical.
The signal paths for the bass range and the mid-range /
high-frequency range are separated before they reach
the power amplifiers, so that each range is handled by its
own output stages, whilst remaining in separate stereo
channels.
This mode of operation increases the power reserves of
the output stages, and this has a particularly positive
effect on the overall dynamics of the system. For a given
volume less power is required from each amplifier. This
in turn reduces intermodulation effects and harmonic
distortion. The result is improved resolution and better
spatial location of the sound.
In the example shown a power amplifier processes both
channels of the mid-range / high-frequency range, while
an other power amplifier handles the bass speakers for
both channels.
It is essential to remove the bridging plugs between the
bass and mid-range/high-frequency channel at the
loudspeaker terminals.
All  power amplifiers can be used in bi-amping
mode, and combined with each other in any way you
wish. The only restriction is that special cables are
needed for certain arrangements - please ask your
specialist
 dealer for details.
Bridged MONO wiring
(see Appendix A 4 )
The amplifier is connected to one channel of the pre-
amplifier via the
XLR or phono input (in the example
shown the XLR input is used). It therefore receives a
MONO signal.
The pre-amplifier's other output channel must then be
connected to a second amplifier.
Only one loudspeaker can be connected to output     A .
Its nominal impedance must be no lower than 4
S
(according to DIN).
This arrangement excludes the possibility of signal
coloration as a result of error signals on the ground
system, since in this mode of operation the output stages'
signal ground system is not subjected to high output
currents. The amplifier's output power is more than
doubled in this mode.
Note:
When using more than one power amplifier it is essential
that all the amplifiers and all the other system
components
are connected to a single wall socket , to
avoid hum due ground loops.
Bi-Wiring (bridged mode)
(see Appendix A 4 )
In this variant of bi-wiring two separate power amplifiers
are used, each driven in bridged
MONO mode. The
amplifier is connected to one channel of the pre-amplifier
via the
XLR or cinch input. It therefore receives a MONO
signal. The pre-amplifier's other output channel must then
be connected to a second amplifier.
This method of operation increases the system's power
reserves, and this has a very positive effect on the
dynamics of the system. For a given volume a lower
output is required from each amplifier, which in turn
reduces intermodulation effects and distortion. The result
is improved resolution and better spatial imaging.