Lexicon LX-7 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 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 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 input selector 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 input selector 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 OUTPUTs
WARNING
of other channels or to other amplifiers.
Note:
If the 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
impedance ratings can 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
. . . continued on page 2-7
2-5