12
AMP
CH 1 in
CH 2 in
CH1 out
CH2 out
CH2—LINE OUT—CH1
CH2—LINE IN—CH1
CH2—LINE OUT—CH1
INPUT
OUTPUT
INPUT
RS232
B
B
A
M
P
CH1
CH2
CH1
CH2
A
A
A
M
P
P 1=G
P 2=+
P 3=-
B
A
SLAVE
QSC AUDIO
PRODUCTS INC.
REPLACE
FUSE WITH
SAME TYPE.
SEE USER'S
MANUAL FOR
RATING.
MADE IN
U.S.A.
Speakers
Speakers
Computer (optional)
R
S
2
3
2
lin
k
(o
p
tio
n
a
l)
CD PLAYER, DAT, ETC.
CD PLAYER, DAT, ETC.
B
A
LINE-LEVEL EQUIPMENT COMPARISONS
The ABX Comparator is useful for comparing line-level
equipment such as CD players, preamplifiers, and other
equipment, too. The setup is a little different and varied with
this form of testing. For example, testing signal sources such
as CD players and DAT recorders requires only the ABX’s
LINE
IN
and
LINE OUT
connectors, but connected with the device
inputs going to the connectors labeled LINE OUT. Use a setup
as shown at right. Be sure to match levels as accurately as possible, and use
identical listening program material.
For line-level devices such as processors, preamps, and other units having inputs and outputs, use a setup as
shown at below right. While Calibrate mode is largely intended for amplifier gain alignment, it can serve as a
tone generator for matching other equipment.
SLEEP MODE
The useful life of the LCD display may be extended by
enabling the sleep mode function. Jumper J103 on the main
PCB enables (J103 shorted) or disables (J103 open) this
function. Sleep mode is factory enabled and will engage 60
minutes after the last key is pressed.
ADJUSTMENTS
Disconnect the AC cord
before opening the cover of the ABX Compara-
tor.
The upward or downward viewing angle of the LCD display may be adjusted by trimpot XXX.
The backdrop light intensity of the LCD is adjusted by trimpot VR101.
If a different calibration signal level is needed, adjust trimpot VR201. The factory default is 1 Vrms.
REPLACING THE FUSE
To replace the fuse, first detach the AC power cord from the ABX Comparator. Then use a screwdriver to gently
pry the fuseholder out of the combination fuseholder/IEC connector, as shown. The fuseholder contains two fuses;
replace them with the same type: 2 amp, 250V.
AMP
CH 1 in
CH 2 in
CH1 out
CH2 out
CH2—LINE OUT—CH1
CH2—LINE IN—CH1
CH2—LINE OUT—CH1
INPUT
OUTPUT
INPUT
RS232
B
B
A
M
P
CH1
CH2
CH1
CH2
A
A
A
M
P
P 1=G
P 2=+
P 3=-
B
A
SLAVE
QSC AUDIO
PRODUCTS INC.
REPLACE
FUSE WITH
SAME TYPE.
SEE USER'S
MANUAL FOR
RATING.
MADE IN
U.S.A.
Speakers
Speakers
Computer (optional)
R
S
2
3
2
lin
k
(o
p
tio
n
a
l)
LINE-LEVEL DEVICE
LINE-LEVEL DEVICE
B
A
CD PLAYER, DAT, ETC.
IN
IN
OUT
OUT
CH2
CH1
CH2
CH1
Содержание ABX Comparator
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