Electro-Voice DELTAMAX DML-1152A Owner's Manual page 9

THE DELTAMAX™ SYSTEM Operation
OPERATION (continued)
5. AMPLIFIER CALIBRATION CONTROLS:
These controls are used for calibrating the con-
troller to both the low- and high-frequency am-
plifiers so that the controller can monitor the
clipping of the amplifier outputs and, if desired,
act as a limiter to prevent amplifier clipping.
See AMPLIFIER/CONTROLLER CALIBRA-
TION section.
NOTE: The calibrated markings on the front
panel correspond to the power level that an
amplifier would deliver to an 8-ohm load. A
crude, approximate calibration can be ob-
tained by rotating the control until the slot of
the trimpot points at a power level equivalent
to the amplifier power rating for an 8-ohm
load. (When the trimpot is in its mid position it
is pointing at 400 watts.)
6. CAL-CLIP LIMIT SWITCH: This switch selects
the mode that controller will monitor the amplifi-
ers (assuming that the controller has been cali-
brated to the amplifiers - see AMPLIFIER/
CONTROLLER CALIBRATION section). With
the switch pushed in, the Amplifier Limit LED's
will indicate when the amplifiers are clipping.
With the switch in the outward position, the Am-
plifier Limit LED's will indicate that gain reduc-
tion is occurring to prevent the amplifiers from
clipping.
NOTE: If the controller has not been cali-
brated to both the low- and high-frequency
amplifiers, the Cal/Clip Limit switch should be
pushed in. This will defeat the compressor/
limiter from trying to prevent amplifier clipping.
(The Amplifier Limit LED's will still flash when
the amplifier exceeds the power levels that the
Amplifier Calibration trimpots are set to.) Poor
sound quality can result with incorrect calibra-
tion and the compressor/limiter engaged.
7. POWERINDICATOR: This LED lights when
the controller is on.
8. POWER SWITCH: This switch turns the con-
troller on and off.
BACK PANEL CONNECTIONS (refer to Pictorial 2)
1. AC POWER CORD RECEPTACLE: This re-
ceptacle is for the ac power cord (supplied with
the unit).
2. FUSE RECEPTACLE: This fuse receptacle
requires either a 0.25 A 250 V slow blow fuse
(for 100/120 V ac operation), or a 0.1 A 250 V
slow blow fuse (for 220/240 V ac operation).
3. SENSE INPUTS:
A. LF: This input is for the connection of the
sense line to monitor the power delivered
to the woofer and should be connected to
the output of the low-frequency amplifier.
B. HF: This input is for the connection of the
sense line to monitor the power delivered
to the compression driver and should be
connected to the output of the high-
frequency amplifier.
NOTE: The Sense Inputs are floating differen-
tial with 5-way binding posts, see CONNEC-
TOR and CABLE REQUIREMENTS section
for detailed wiring information.
4. OUTPUTS:
A. LF: This input is the low-frequency output
of the DMC crossover/controller and
should be connected to the input of the
low-frequency amplifier.
B. HF: This connection is the high-frequency
output of the DMC crossover/controller
and should be connected to the input of
the high-frequency amplifier.
PICTORIAL 2 — DMC-1152B Back Panel Diagram