Wharfedale MP 1200 ユーザーズマニュアル

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 corresponding +/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.