INSTALLATION
The Phonic Installation fits into standard rack, and takes one unit height of space(1 3 / 4
,,
)Additional 4
,,
depth for the con-
nectors on the back panel is needed Be sure that there is enough air space around the unit for cooling and please do not
place the Installation in contact to or directly on top of high tem perature devices such as power amplifiers etc to avoid
overheating
RACK MOUNTNG
The Installation has to be connected with 1/4
,,
TRS plugs Although the inputs and outputs are fully balanced, the active
servo circ uitry can be wired with unbalanced soureces and loads as well
CONNECTORS
Both of the inputs impedance are 20k Ohms and can be driven by most sources lf a device,s output requires a match load of
600 Ohms(mostly from output transformers), 600 Ohms resistor should be tied across pin 2 and 3 on the input connectors
As standard the outputs of the Installation are electronically bala nced and have an output impedance lower than 100 ohms
When driving transformer coupled loads it may be ne cessary to create a 600 Ohm source impedance For this purpose install
two 247 0hms resistors in series with Pin 2 and 3
Impedance
Most of the mistakes in audio installations are incorrect and defective audio connections In order to perfectly complete your
installation, please pay special attention to the following section unless you are already familiar with balanced/unbalanced
operation
Unbalanced/Balanced Connection
You can find this system in most of home audio-video system It got one conductor to carry the signal, and the other
conductor for ground Normally for lower level signal, the signal conductor is shielded by the ground Conductor
What is an unbalanced system?
Balanced system transmits the signal via 2 conductors plus one ground shielding conductor The 2 signal conductors carry
the same signal but out of phase For the balanced input stage, the amplifier will boost the difference of the 2 signal
conductors and remove the identical pa rt (known as common mode signal) of the 2 signal conductors Because of the real
signal is carried by the 2 conductors out of phase, so it is perfectly carry to the input At the same time, the inte rference
occurs during transmission will be identical part(common mode), beca use the signal conductors are run together, there is
no chance they can be different, and all the interfere nce will be removed by the bala nced input amplifier
What is a balabced ststen?
Because the common mode interference immunity of balanced system, and at the same time, the ground conductor
doe sn,t need to carry any electrical current so that it means the ground of the 2 connected units has identical ground level
which is vital to interference free system
Let, s look back to unbalanced system, the signal electrical current is from signal conductor to ground conductor, and that
means the ground level of 2 connected units are not identical This means the system is much more easier to be interfered
with noise
Running long cables is easy for bala nced system but difficult for unbalanced system, and lower noise is always
characterized in balanced system
B ecause balanced system needs 2 cond uctors for signal and 1 conductor for ground minimum 3 conductors are needed for
wiring balanced system So dedicated system separates ground and shield as 2 conductors
Please read following section for proper wiring balanced and unbalanced system:
The difference in between 2 operations:
Normal-phase signal
+ normal-phase noise.
Desired signal
with no noise.
Normal-phase signal
+ reverse-phase noise.
Unbalanced lines are fine if you
,
re in
a relatively noise-free environment.
The ambient electromagnetic noise
level will be the ultimate deciding
factor, but balanced is best.
Shorft line-level runs:
Long line-level runs:
3
10
e j
B
A
L
A
N
C
E
D
U
N
B
A
L
A
N
C
E
D
I
N
S
E
R
T
C
O
R
D
Ti
p
Ring
Sleeve
1
2
3
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
1
2
3
1
2
3
1
2
3
1
2
3
Ti
p
Sleeve
Ti
p
Sleeve
1
2
3
Centre
Screen
Ti
p
Sleeve
Ti
p
Sleeve
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
Ti
p
Sleeve
Ti
p
Sleeve
Centre
Screen
1
2
3
1
2
3
1
2
3
Ti
p
Ring
Sleeve
T
ip(Send)
Sleeve
T
ip(Send)
Sleeve
Ti
p
Ring
Sleeve
1
2
3
(Send)
1
2
3
(Return)
Ti
p
Ring
Sleeve
Centre
Screen
Centre
Screen
(Send)
(Return)
Ti
p
Ring
Sleeve
1
2
3
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
B
A
L
A
N
C
E
D
Y
C
O
R
D
H
E
A
D
P
H
O
N
E
S
P
L
I
T
T
E
R
U
N
B
A
L
A
N
C
E
D
Y
C
O
R
D
S
P
E
A
K
D
N
L
E
A
D
S
Pin
1
+
Pin
1
-
Ti
p
Sleeve
Black
Red
Centre
Screen
Centre
Screen
1
2
3
1
2
3
1
2
3
Ti
p
Ring
Sleeve
1
2
3
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
Ti
p
Sleeve
Ti
p
Sleeve
1
2
3
1
2
3
Ti
p
Sleeve
Ti
p
Sleeve
Ti
p
Ring
Pin
1
+
Pin
1
-
Ti
p
Ring
Sleeve
Ti
p
Ring
Sleeve
Summary of Contents for 3.1 series
Page 2: ......
