Lexicon LX - REV 3 User Manual page 13

LX Power Amplifiers
1. Power Switch
Disconnects power to the AC Input Connector. Set this switch
to off when making or breaking connections to the amplifier,
or when changing the setting of the MODE switch.
2. AC Input Connector
The AC input connector provides power to the unit with the
supplied power cord (3 conductor, 14AWG). Do not use an
extension cord. For optimal performance, use an isolated
power receptacle with adequate current (15 or 20 amps). Line
voltages ≥10% above the specified voltage may damage the
amplifier. Line voltages ≤10% below the specified voltage may
cause the amplifier to enter a protection mode, indicated by
the red standby LED flashing.
3. INPUT 1 to 7 (LX-7) or 1 to 5 (LX-5)
Provide audio input for the speakers connected to the
corresponding audio outputs. When using the unbalanced
(RCA) audio inputs, make sure the UNBAL/BAL switch
located to the left of each XLR connector is set to UNBAL.
When using the balanced (XLR or 1/4-inch tip/ring/sleeve)
audio inputs, make sure the UNBAL/BAL switch is set to BAL.
The illustrations below show the appropriate cable ends for
1/4-inch T/R/S and XLR connectors.
Male
Cable End
3 = Negative
1 = Ground
Tip Sleeve
Tip = Positive
Ring = Negative
Sleeve = Ground
Ring
2 = Positive
4. OUTPUT 1 to 7 (LX-7) or 1 to 5 (LX-5)
Provide audio output for the speakers. OUTPUT connectors can
accept bare speaker wires, banana plug connectors, or certain
spade connectors. When using bare speaker wires, loosen the
connector, insert the wire into the top of the receptacle, then
tighten the connector. The same procedure should be used for
spade connectors. Banana plugs should be inserted into the
outward-facing receptacle.
Use heavy gauge speaker cable to ensure low-impedance
connections between the amplifier and the speakers. Observe
correct speaker polarity.
Do not connect the OUTPUTs of one channel to the
WARNING
OUTPUTs of other channels or to other amplifiers.
Note:
If the rear panel MODE switch is set to INDIVIDUAL,
speakers must have impedance ratings of 2Ω or
higher. If set to (BRIDGED), speakers must have
impedance ratings of 4Ω or higher. Using speakers
with lower than
ratings might activate protection modes.
5. MODE Switch
Configures channels 1 and 2 or 3 and 4 for INDIVIDUAL or
(BRIDGED) operation. When set to INDIVIDUAL, all INPUTs and
OUTPUTs function as separate channels. When set to
(BRIDGED), the selected INPUTs and OUTPUTs are combined
to create a single high-power channel.
Basic Operation
recommended impedance
. . . continued on page 2-7
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