Macro-Tech 3600VZ Power Amplifier
Page 9
Reference Manual
Fig. 2.1 Front Facilities
2 Facilities
A. Dust Filter
The dust filters remove large particles from the air at the
air intake. Check filters regularly to be sure they do not
become clogged. The filter elements can be easily re-
moved for cleaning by gently pulling them away from
the front panel (see Sections 3.2 and 4.5).
B. Level Controls
The level for each channel is set with these convenient
controls mounted on the front panel. Each level control
has 31 detents for precise adjustment (see Section 4.4).
A security option is available to prevent tampering (see
Section 8.2).
C. Signal / IOC Indicators
The presence of an audio signal and the distortion level
of each channel is represented by these green multi-
function indicators. As signal presence indicators, they
flash with normal intensity in sync with the output audio
signal to indicate its presence. As IOC (Input/Output
Comparator) indicators, they compare the waveform of
the input signal to that of the output. They flash brightly
with a 0.1 second hold delay if there is a difference (or
distortion) of 0.05% or more. Another IOC function is to
indicate input overload. If the input signal is too large
the indicators will flash brightly (with a 0.5 second hold
delay) to indicate input clipping distortion.
Note: The
Channel 2 IOC indicator will stay on in Parallel-Mono
mode (refer to Section 4.2).
D. ODEP Indicators
During normal operation of the Output Device Emula-
tion Protection circuitry, these indicators glow brightly
to show the presence of reserve thermodynamic energy.
They dim proportionally as energy reserves decrease.
In the event that energy reserves are depleted, the indi-
cators turn off and ODEP proportionally limits output
drive so the amplifier can safely continue to operate
even under severe conditions. These indicators can
also help to identify more unusual operating problems
(see Section 4.2).
E. Enable Indicator
This indicator lights when the amplifier has been “en-
abled” or turned on, and AC power is available (see
Section 4.2).
F. Enable Switch
Depress this push-button to turn the amplifier on or off.
When turned on, the output is muted for approximately
four seconds to protect your system from start-up tran-
sients. (This delay can be changed. Contact the Crown
Technical Support Group for details.)
G. Power Cord
All 120 VAC, 60 Hz North American units include a
NEMA TT30P plug. These units also include 30-amp
(10 AWG) line cord. Other units are equipped with a
power cord and plug that is appropriate for the voltage
requirements of the amplifier.
H. Stereo/Mono Switch
The three operating modes of this amplifier are
controlled by this switch. Stereo mode is available for
normal two-channel operation. Bridge-Mono mode is
available to drive a single load with an impedance equal
to or greater than 4 ohms. Parallel-Mono mode is
