5
Owner’s Manual
Owner’
s Manual
Getting Started
The following steps will help you set up the
amplifier and get the levels just right.
Settings:
1. Be sure the amplifier’s power switch is off.
2. Turn down both level controls.
3. On the rear panel, set the subsonic filter switch
off and the clip limit switch on.
4. Determine which amp mode is best for your
application:
Stereo
mode is the typical setup for
amplifying stereo signals. Input 1 is routed
to the channel 1 output, and input 2 is routed
to the channel 2 output.
Mono
mode is used for sending a mono signal
to both outputs with separately adjustable level
controls. Input 1 is used in mono mode. (Leave
input 2 disconnected).
Bridge
mode uses both amplifier channels
to power one speaker (or set of speakers).
Input 1 is used in bridge mode. (Leave input
2 disconnected and its level control turned
down).
Note:
4 ohms is the minimum speaker
impedance you should connect to the
amplifier in bridge mode.
5. Set the amp mode switch according to your
application and delicate sensibilities.
Connections:
1. Using balanced cables, make connections from
the mixer’s (or other line-level signal source)
main outs to the amplifier’s inputs.
2. In stereo mode, connect the cables from the
signal source to the amplifier’s combo input
jacks, either XLR or 1/4" TRS. The XLR and TRS
inputs for each channel are wired in parallel.
• The balanced XLR inputs are wired as follows:
Pin 1 = shield (ground)
Pin 2 = hot (+)
Pin 3 = cold (–)
• The 1/4" TRS inputs are wired as follows:
Tip = hot (+)
Ring = cold (–)
Sleeve = shield (ground)
3. In mono mode and bridge mode, connect one
cable from the input source to input 1, and
connect nothing to input 2.
4. In stereo and mono modes, connect speaker
cables to the speaker outputs, either the
binding posts or the NL4 connectors.
• The binding post connectors are wired as
follows:
Red = hot (+ speaker terminal)
Black = cold (– speaker terminal)
• The NL4 connectors are wired as follows:
1+ = hot (+ speaker terminal)
1– = cold (– speaker terminal).
5. In bridge mode, if using the binding post
outputs:
Ch 1 red post = hot (+ speaker terminal)
Ch 2 red post = cold (– speaker terminal)
Do not use the black terminals.
If using a NL4, connect it to the center bridged
NL4 connector. This is wired as follows:
1+ = hot (+ speaker terminal)
2+ = cold (– speaker terminal)
6. Plug all the sound system components into
suitable AC outlets, properly grounded and
capable of delivering adequate current.
7. Make sure your signal source is powered up
and delivering signal to the amplifier.
8. Turn the amplifier’s power switch on. Verify
that the power LED lights.
9. Slowly turn up both level controls on the
amplifier. You should hear music and see
the meters and sig LEDs flashing. If the
OL (overload) LEDs are flashing, turn down
either the level controls on the amp or the
source signal’s output level controls
(i.e., master faders), until the OL LEDs
either blink occasionally or not at all.
10. For quieter listening, it is preferable to adjust
the amp’s level controls rather than the source
signal’s output level (unless you have the
source’s control all the way up!).
Things to remember:
• Never plug amplifier outputs into anything
except speakers (unless you have an outboard
box specifically designed to handle speaker-
level signals).
• Before making connections to an amp or
reconfiguring an amp’s routing, turn the
amp’s level controls down, turn the power
off, make the changes, turn the power back
on, and then turn the level controls back up.
• When shutting down the equipment, turn off
the amplifiers first. When powering up, turn on
the amplifiers last.
