6
MP 1200/1800
POWER AMPLIFIER
POWER AMPLIFIER
A great deal of mistakes in sound
installations can be down to wrongly wired
audio connections. It is important that the
connections are correct to suit your system.
Unbalanced system
An unbalanced audio system is typically a
single conductor shielded with the centre
conductor relaying the signal and the shield
at ground.
Balanced system
Using a balanced audio system is where a
two conductor shielded cable has each of
the two centre conductors carrying the
signal but of opposite phase. This gives
each conductor an equal but inverted
potential difference from that of the ground.
It is recommend that you use balanced audo
connections if the unit before your amplifier
has a balanced output. This will eliminate
such as mains hum. For the best results
xommon grounding should be avoided. This
means not connecting the ground on both
the amplifiers input and output connectors.
Wharfedale pro advise that you connect the
ground (shield) of the input connecting
cable to the ground of the signal source
while making sure the ground (shield) is not
connected to the amplifier's input connector.
The output cable connector from the
amplifier if linking to another amplifier
(daisy chained via parallel input sockets)
should have the ground (shield) connected.
The input connector ground (shield) to the
following amplifier should not be connected.
This is the process by which the ground
(shield) is connected (tied) at the source unit
but is not connect to the destination unit. If
hum develops in some instances the ground
(shield) can be connected on the input.
Some manufacturers have units that
recommend that the input connector ground
(shield) is tied and the output disconnected.
In this instance you may need to connect the
input connector ground (shield) going to the
input of the wharfedale pro unit. If an
unbalanced system is used with XLR
connections please connect pin 3 to pin 1
(ground) of the connector. This will mean
that pin 2 transports the positive (+/hot)
signal. If pin 3 to pin 1 are not connected
this results in the negative (-/cold) input
being 'open'. This will give an audible
degradation of the signal to noise ratio. This
would relate to both the input and output
connectors and involve the cable ground
(shield) connected at both.
Please note that some manufacturers run
their units with pin 2 (-/cold) and pin 3
(+/hot). This should be looked out for and
then the wiring could be modified with
labelled cables so that connections of +/hot
go to their corresp/hot etc. Some
manufactures run their units with balanced
inputs and unbalanced outputs, therefore
care should be taken with the connections
when inserted into the system.
2
1
3
1
2
3
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS
BALANCED OUTPUT
SIGNAL DIRECTION
INPUT to Wharfedale Pro unit
Ground (earth)
CABLE
Only connect ground if hum occurs
,,
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH 1/4 JACK to XLR CONNECTORS
SIGNAL DIRECTION
BALANCED OUTPUT
INPUT to Wharfedale Pro unit
1
2
3
Ground (earth)
CABLE
Only connect ground if hum occurs
SLEEVE
RING
TIP
RING
2
1
3
1
2
3
BALANCED OUTPUT WIRING FROM WHARFEDALE PRO UNIT WITH XLR CONNECTORS TO BALANCED UNIT
OUTPUT from Wharfedale Pro unit
SIGNAL DIRECTION
BALANCED INPUT
Ground (earth)
CABLE
Only connect ground if hum occurs
TIP
SLEEVE
Ground (earth)
CABLE
TIP
SLEEVE
INPUT to Wharfedale Pro unit
SIGNAL DIRECTION
OUTPUT
INPUT
SIGNAL DIRECTION
OUTPUT Wharfedale Pro unit
,,
UNBALANCED INPUT AND OUTPUT WIRING WITH MONO 1/4 JACK CONNECTIONS
2
1
3
Ground (earth)
CABLE
Only connect ground if hum occurs
RING
SIGNAL DIRECTION
INPUT to
Wharfedale Pro unit
TIP
SLEEVE
,,
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS to STEREO 1/4 JACK
BALANCED OUTPUT
TIP
SLEEVE
Ground (earth)
CABLE
Only connect ground if hum occurs
SLEEVE
TIP
RING
SIGNAL DIRECTION
INPUT to Wharfedale Pro unit
,,
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH STEREO 1/4 JACK to XLR CONNECTORS
BALANCED OUTPUT
