dbx 3031 Посібник з експлуатації - Сторінка 11
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30 SERIES GRAPHIC EQs
I
NSTALLATION
H
C
OOKUPS AND
ABLING
equalizers can be used with either balanced or unbalanced sources and the outputs can be used with
either balanced or unbalanced loads, provided the proper cabling is used.
A balanced line is defined as two-conductor shielded cable with the two center conductors carrying
the same signal but of opposite polarity when referenced to ground. An unbalanced line is generally
a single-conductor shielded cable with the center conductor carrying the signal and the shield at
ground potential.
I
C
C
NPUT
ABLE
ONFIGURATIONS
unbalanced. This makes the 30 Series equalizers audio inputs suitable for use with virtually any
source impedance, low or high.
Note that XLR pins 2 and 3 are reversed on some products that you may be using with the equalizer.
O
C
C
UTPUT
ABLE
+21dBu. For maximum hum rejection with a balanced source, avoid common grounding at the
equalizer's inputs and outputs. Most balanced (3-conductor) cables have the shield connected at
both ends. This can result in ground loops which cause hum.
If hum is a problem, try changing the position of the rear panel GROUND LIFT switch so that the
ground is lifted. If hum persists try disconnecting the shield on one or more of the other cables in the
system, preferably at the input of a device, not at the output.
The chassis ground or ÒearthÓ ground may be separated from the circuit ground by removing the
CHASSIS GROUND LIFT STRAP on the back panel of the equalizer. This may also prevent ground
loops in the sound system.
N
B
ORMAL
ALANCED
Connection
Ground:
High:
Low:
N
U
ORMAL
NBALANCED
Connection
Ground:
High:
Low (ground):
Tie pin 3 to the ground for unity gain in/out of the equalizer when using unbalanced input connections
to balanced output connections or balanced input connections to unbalanced output connections. To
do otherwise wonÕt hurt the unit but will result in unmatched input to output levels, and the level con-
trol will not be properly calibrated.
C
ONSIDERATIONS
:
The 30 Series equalizers are designed for nominal +4dBu levels. The
:
The equalizer has an input impedance of 75k½ balanced and 50k½
:
The equalizer's output is capable of driving a 600½ load to
ONFIGURATIONS
C
ONNECTIONS FOR
XLR
TRS 1/4" Jack Barrier strip
Pin 1
Sleeve
Pin 2
Tip
Pin 3
Ring
C
ONNECTIONS FOR
XLR
TRS 1/4Ó Jack TS 1/4Ó Jack
Pin 1
Sleeve
Pin 2
Tip
Pin 3
Ring
INSTALLATION CONSIDERATIONS
I
O
NPUTS AND
UTPUTS
Ground
(+)
(-)
I
O
NPUTS AND
UTPUTS
Sleeve
Tip
Sleeve
Barrier strip
Ground
(+)
(-)