4
INSTALLATION & OPERA-
Should the heat sink reach 95C, thermal protection cir-
cuitry will automatically disconnect the amplifier’s out-
put stage from the load (loudspeaker) until the tempera-
ture decreases sufficiently. The action of removing the
load eliminates output current, resulting in an immedi-
ate temperature drop. The thermal protection circuit
will automatically reconnect the load when the tem-
perature drops below 95C.
Fan Assist Cooling
To provide continuous operation under adverse operat-
ing conditions, a Dual Fan Forced Air Cooling System
has been added for extra protection.
Temperature is controlled automatically by a thermal
switch which turns on the Cooling System when re-
quired.
Controls/Connections
POWER SWITCH
To turn the amplifier ON or OFF, press the upper or
lower portion of this rocker switch.
POWER INDICATING LED
This LED indicates power is turned ON.
LEVEL CONTROLS
Each channel has a separate low noise 41 click detent
rotary level control. Rotate controls clockwise to in-
crease level.
SIGNAL STATUS INDICATORS
Two green LED indicators are normally off with no sig-
nal present and illuminate when signal is present.
CLIP INDICATORS
Two red LED indicators illuminate when the amplifier
has reached full power, If the amplifier is driven into a
clip condition, a Softclip circuit is activated attenuating
the input signal and preventing a Hard Clip condition
where the amplifier’s output saturates to a DC level.
1/4” JACK INPUT CONNECTIONS
Balanced and Unbalanced inputs can be accepted via
the 1/4” Jack. Balanced inputs: Tip = High, Ring =
low, Sleeve = Ground.. Unbalanced inputs: Tip = High,
Sleeve = Ground.
Note:
The Unbalanced 1/4” Jack parallels the XLR
connector for easy daisy chaining of amplifier inputs.
XLR INPUT CONNECTIONS
XLR input connectors are provided for balanced input
signals. Please note; Pin 1: Ground, Pin 2; High, Pin 3:
Low
GROUND/LIFT SWITCH
To eliminate ground loops between this amplifier and a
preamplifier in certain installations, a GROUND/LIFT
SWITCH is provided.
INPUT SIGNAL SELECTOR SWITCH
This switch is used to select one of three input configu-
rations.
1) PARALLEL: The input signal is applied to Channel
One only. Channel One and Two inputs are connected
in parallel and the same signal at both Channel One
and Channel Two outputs.
NOTE: Channel Two’s input becomes a signal output
for use in Daisy Chaining additional amplifiers.
2) STEREO: This is the amplifiers standard mode of op-
eration where channel inputs and outputs corresponds
(Chan. 1 in = Chan. 1 out and Chan. 2 in = Chan. 2 out.)
3) BRIDGED: This mode is used to obtain the highest
power output levels possible from the amplifier. Both
Channels combine to form a single high power mono
output. See Bridged Mono Operation Pg. 9.
OUTPUT CONNECTIONS
Output connections are made via five-way binding
posts. Polarity is indicated by red and black terminals.
We suggest the use of dual banana plugs for convenient
and reliable hook-up. They also allow quick connec-
tion changes, when reversing polarity, as required dur-
ing test and calibration of multilevel biamplified and
triamplified systems. Heavy Class 11 wire may be used
by unscrewing the large plastic portion of the output
terminal and inserting the wire into the hole provided.
EXTREMELY IMPORTANT:
When making wire connections, Double Check that NO
wire strands or ends touch an adjacent terminal, short-
ing the output.
CAUTIONS:
Never strap the two red output terminals together (in
parallel).
Never connect either red output terminal to chassis
ground.
FUSE HOLDER
The Fuse Holder contains the Primary AC Fuse. The
fuse should only be replaced with one of the same type.
If the fuse continues to blow out, stop replacing the fuse
and refer servicing to qualified personnel.
