dbx 160X - Page 20

160XT
INSTALLATION CONSIDERATIONS
Input/Output Cable Configurations
Hookups and Cabling
The 160XT is a 6000, balanced (differential) unit designed for nominal
+4dBm levels; inputs and outputs are tip/ring/sleeve phone jacks and XLR
connectors. The 160XT can be used with either balanced or unbalanced
sources and outputs can be used with either balanced or unbalanced
loads, provided you use proper cabling.
A balanced line is defined as two-conductor shielded cable with the two
center conductors carrying the same signal but of opposite polarity with re¬
spect 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.
Connect Audio Inputs
The 160XT has an actual input impedance of lOOkO in balanced configu¬
ration or 50kO if unbalanced. This makes the 160XT audio input suitable
for use with virtually any source impedance, low or high. The 160XT’s in¬
put connectors are wired in parallel. That is, the phone jack TIP (+) con¬
nection is internally wired to the XLR-type pin 3, the RING (-) is wired to
pin 2, and the SLEEVE (shield) is wired to pin 1. Note that pins 2 and 3
are the reverse of certain other manufacturer’s equipment, but if the same
connection is used at the output, the signal will be correctly polarized (“in
phase”).
Reversing the input wires to the input terminals will result in the output sig¬
nal polarity being the opposite of the input signal (“180° out of phase").
The 160XT has a rear-panel GROUND LIFT switch. This switch discon¬
nects the input XLR-type pin 1 from the 160XT’s circuit ground This is
to allow troubleshooting of hum and other grounding problems without
having to change the cabling. We advise starting with the switch in the
LIFT position (shield disconnected at the 160XT input).
Output Cable Considerations
Connect Audio Outputs
The model 160XT has two separate outputs: one single-ended amplifier
driving the 1 4“ stereo phone jack, and a separate active-balanced ampli¬
fier driving the XLR-type output connector. Each is capable of driving a
600 ohm load to +24dBu.
NOTE: Contact our Customer Service Department for information regard¬
ing factory installation of the optional balanced transformer. Our phone
number is listed on the inside of the front cover.
19