dbx 266XL Owner's/Operator's Manual page 8

6
Expander/Gate RATIO Control:
This control sets the amount of attenuation applied to the input signal once it is below
the threshold, from gentle downward expansion (appropriate for mixed program,
vocals, etc.), to a hard gating effect (which can be useful for percussion). Fairly low
RATIO (and higher Expander/Gate THRESHOLD) settings work best for downward
expansion, whereas higher RATIO settings (clockwise towards MAX) work best for
gating. If a setting produces undesirable pumping, readjust the Expander/Gate RATIO
or THRESHOLD setting.
Note: The attack and release rate of the Expander/Gate are program-dependent - very fast for transient
material (e.g., percussion) and slower for material with slow attack (e.g., vocals).
Note: Fast gating of sustained low frequency signals can result in "chattering". To eliminate any "chattering"
simply adjust the RATIO control. The proper THRESHOLD setting will also minimize false triggering and
"chattering."
15 WATTS
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
100V 50/60Hz
MODEL 266XL
120V 60Hz
COMPRESSOR/GATE
INPUT Jacks (CHANNEL 1 and 2):
Use 1/4Ó phone plugs or male XLR plugs to connect these inputs to your source. The
266XL's INPUT jacks accept either balanced or unbalanced signals. Input impedance
is >40k½.
OUTPUT Jacks (CHANNEL 1 and 2):
The OUTPUT jacks accept 1/4Ó balanced or unbalanced phone plugs or female XLR
plugs. Maximum output signal level is >+20dBu. In the +4dBu setting, the balanced
output impedance is 100½, and the unbalanced output impedance is 50½. In the
-10dBV setting, the balanced output impedance is 1k½ and the unbalanced output
impedance is 500½.
OPERATING LEVEL Switch
This switch selects between a -10dBV and +4dBu nominal operating level. When the
switch is in the IN position, a -10dBV operating level is selected. When it is in the
OUT position, a +4dBu operating level is selected. Note that the switch is slightly
recessed. This is to provide protection against accidental activation, possibly causing
damage to other system components due to a sudden change in gain.
SIDECHAIN INSERT Jack:
This jack accepts 1/4Ó TRS phone plugs and provides a connection to the 266XL
detector path. The RING acts as a Send, carrying a buffered version of the signal pre-
sent at the 266XL INPUT jack, at an impedance of 2k½. The TIP acts as a Return for
equipment to feed the 266XL's detector circuitry, such as an equalizer for de-essing or
frequency-sensitive gating/compression. You can also drive the 266XL Sidechain input
with the output of most equipment, by using a 1/4Ó mono phone plug. Input
Impedance is greater than 10k½.
Note: When a cable is plugged into this jack, it automatically breaks the connection from the INPUT jack to
the 266XL's detection circuitry.
266XL
Compressor / Gate
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING U.S. PATENTS 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792 4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324 4,473,793 OTHER PATENTS PENDING
PHONE:
CHANNEL 2
TIP
OUTPUTS INPUTS
RING
SLEEVE
+4 dBu
-10 dBV
XLR:
PIN 1
PIN 2
PIN 3
CHANNEL 1
SIDECHAIN
INSERT
OUTPUTS
TIP=INPUT
RING=OUTPUT
+4 dBu
-10 dBV
SIDECHAIN
INSERT
INPUTS
TIP=INPUT
RING=OUTPUT
Rear Panel