Allen & Heath AP5195 用户手册
30
PA User Guide
2TRK INPUT
A pair of RCA phono sockets accepts the
input from a stereo playback devices such as a CD, MiniDisc,
DAT or tape player. Use it to monitor a stereo recording in the
console headphones, or to route a stereo source to the LR mix
for background music. The input is unbalanced and has 0dBu
line level sensitivity.
DAT or tape player. Use it to monitor a stereo recording in the
console headphones, or to route a stereo source to the LR mix
for background music. The input is unbalanced and has 0dBu
line level sensitivity.
2TRK OUT
The LR mix is also available at a pair of RCA
phono sockets for connection to a 2-track recording device
such as MiniDisc, DAT or tape recorder. The output is
unbalanced and operates at 0dBu line level. It can be sourced
pre or post the LR faders and is buffered from the LR
connections to ensure that plugging in here does not affect the
main output.
such as MiniDisc, DAT or tape recorder. The output is
unbalanced and operates at 0dBu line level. It can be sourced
pre or post the LR faders and is buffered from the LR
connections to ensure that plugging in here does not affect the
main output.
2TRK DIGITAL OUT
A digital version of the 2-track
output described above is available from this RCA phono
socket. It is in SPDIF format and uses high grade ADC
converters. Plug into the SPDIF coax input on equipment such
as recorders, digital audio processors and computer sound
cards. Bypassing the input ADC devices on such equipment
can reduce audio quality degradation, especially if they use low
grade devices.
socket. It is in SPDIF format and uses high grade ADC
converters. Plug into the SPDIF coax input on equipment such
as recorders, digital audio processors and computer sound
cards. Bypassing the input ADC devices on such equipment
can reduce audio quality degradation, especially if they use low
grade devices.
☺
Connecting SPDIF Use 75 ohm coaxial cable. Pre-
made SPDIF cables are readily available. You can also use
standard 75 ohm coaxial video cable. Do not use standard
RCA to RCA audio cables.
standard 75 ohm coaxial video cable. Do not use standard
RCA to RCA audio cables.
Do not plug SPDIF signals into analogue
connections. While it is unlikely to cause physical damage
it can result in unpleasant audible noise.
it can result in unpleasant audible noise.
AB SLAVE OUT
TRS line outputs for connecting to
external line level equipment such as booster amplifiers. They
are impedance balanced and can work with balanced or
unbalanced inputs. Operating level is 0dBu. The output
follows the panel AB source selection and EQ settings. It is not
affected by the AB level controls. It does not break the signal
path to the AB XLR outputs.
are impedance balanced and can work with balanced or
unbalanced inputs. Operating level is 0dBu. The output
follows the panel AB source selection and EQ settings. It is not
affected by the AB level controls. It does not break the signal
path to the AB XLR outputs.
AB MAIN OUT
Rear panel XLR line outputs for
connecting to external line level equipment such as speaker
processors and amplifiers. They are electronically balanced
and operate at 0dBu. They are affected by the A and B level
controls. Use good quality 2-core shielded signal cable for
best results.
processors and amplifiers. They are electronically balanced
and operate at 0dBu. They are affected by the A and B level
controls. Use good quality 2-core shielded signal cable for
best results.
Electronically balanced outputs use a 3 wire
connection to provide improved signal drive and interference
rejection when plugged into balanced equipment inputs.
Signal hot (+) = pin 2, signal cold (-) = pin 3, ground (cable
shield) = pin 1. The output generates equal level but opposite
polarity signals on pins 2 and 3. The pin 3 (-) signal gets
inverted by the receiving equipment input and therefore adds
to the pin 2 (+) signal. Interference, on the other hand, gets
picked up equally and with the same polarity on both the pin 2
and pin 3 wires. Because of the input stage inversion it
therefore cancels and is rejected leaving a clean audio signal.
rejection when plugged into balanced equipment inputs.
Signal hot (+) = pin 2, signal cold (-) = pin 3, ground (cable
shield) = pin 1. The output generates equal level but opposite
polarity signals on pins 2 and 3. The pin 3 (-) signal gets
inverted by the receiving equipment input and therefore adds
to the pin 2 (+) signal. Interference, on the other hand, gets
picked up equally and with the same polarity on both the pin 2
and pin 3 wires. Because of the input stage inversion it
therefore cancels and is rejected leaving a clean audio signal.
The balanced outputs can work with unbalanced equipment
inputs by linking the XLR pin 3 (-) to pin 1 (ground).
inputs by linking the XLR pin 3 (-) to pin 1 (ground).
SPDIF explained SPDIF stands for “Sony
Philips Digital InterFace”. It is a standard
developed by the consumer electronics industry
for interfacing digital audio signals. It has the
advantages that audio can be passed from one
digital device to another without the need for
analogue conversion, and that both the left and
right signals are carried on a single cable. It has
become popular with manufacturers of
consumer and professional audio and computer
products. There are two types for SPDIF
connection, coax and optical. Coax uses the
RCA connector and 75 ohm coaxial cable.
Toslink is the optical version that uses fibre-optic
cable. The coax version can work with cable
lengths up to 15 metres.
developed by the consumer electronics industry
for interfacing digital audio signals. It has the
advantages that audio can be passed from one
digital device to another without the need for
analogue conversion, and that both the left and
right signals are carried on a single cable. It has
become popular with manufacturers of
consumer and professional audio and computer
products. There are two types for SPDIF
connection, coax and optical. Coax uses the
RCA connector and 75 ohm coaxial cable.
Toslink is the optical version that uses fibre-optic
cable. The coax version can work with cable
lengths up to 15 metres.
BALANCED PIN2 = +
MAIN OUTPUT