Macro-Tech 3600VZ Power Amplifier
Page 30
Reference Manual
Controls
Enable:
A front panel push button used to turn the am-
plifier on and off.
Level:
A 31-position detented rotary attenuator for each
channel located on the front panel used to control the
output level.
Stereo/Mono:
A three-position back panel switch used
to select Stereo, Bridge-Mono or Parallel-Mono opera-
tion.
Sensitivity:
A three-position switch located inside the
PIP compartment used to select one of three input sen-
sitivities for both channels: 0.775 volts or 1.4 volts for
standard 1 kHz power or a voltage gain of 26 dB.
Input Ground Lift:
A two position back panel switch
used to isolate the phone jack signal grounds from the
chassis (AC) ground.
Reset:
A back panel button for each channel used to
reset the corresponding power supply. 100 and
120 VAC units have 15 amp circuit breakers. 230 VAC
units have 7.5 amp circuit breakers.
Indicators
Enable:
This amber indicator is on when the amplifier
is switched on to show that the low voltage power sup-
ply is operating.
Signal / IOC:
Two green indicators flash with medium
intensity in sync with the amplifier’s outputs to show sig-
nal presence. In the unlikely event the output waveform
differs from that of the input by 0.05% or more, they
flash brightly to indicate distortion. As sensitive distor-
tion indicators they provide proof of performance.
Note:
It is normal for the Channel 2 IOC indicator to remain on
in Parallel-Mono mode.
ODEP:
Each channel has an amber front panel indica-
tor that shows thermal-dynamic energy reserve. Nor-
mally, each ODEP indicator is lit to show available
reserve energy. The indicator will dim proportionally as
the energy reserve for its channel decreases. In the rare
event that a channel has no reserve, its indicator will
turn off and the ODEP circuitry will limit the channel’s
output drive (see Section 4.2).
Input/Output
Input Connector:
Balanced ¼-inch phone jacks on
chassis and internal
PIP connector. (Balanced 3-pin
XLR connectors are provided on the P.I.P.-FX which is a
standard feature.)
Input Impedance:
Nominally 20 k ohms, balanced.
Nominally 10 K ohms, unbalanced.
Input Sensitivity:
Switchable between 0.775 V (unbal-
anced) for rated output or a fixed voltage gain of 26 dB.
(See subsection 4.4 for more information.)
Output Connector:
Color-coded dual binding posts
(banana jacks).
Output Impedance:
Less than 10 milliohms in series
with less than 2 microhenries. See Figure 6.5.
DC Output Offset:
(Shorted input) ±10 millivolts.
Output Signal
Stereo:
Unbalanced, two-channel.
Bridge-Mono:
Balanced, single-channel. Channel 1
controls are active; Channel 2 controls are inactive and
not removed from operation.
Parallel-Mono:
Unbalanced, single-channel. Channel
1 controls are active; Channel 2 controls are inactive
but not removed from operation.
Protection
Macro-Tech amplifiers are protected against shorted,
open or mismatched loads; overloaded power supplies;
excessive temperature, chain destruction phenomena,
input overload damage and high-frequency blow-ups.
They also protect loudspeakers from input/output DC
and turn-on/turn-off transients.
If unreasonable operating conditions occur, the pat-
ented ODEP circuitry proportionally limits the drive level
to protect the output devices, particularly in the case of
elevated temperature. Transformer overheating results
in a temporary shutdown of the offending channel.
When it has cooled to a safe temperature, the trans-
former automatically resets itself. Controlled slew rate
voltage amplifiers protect against RF burnouts, and in-
put overload protection is provided by current-limiting
resistance at the input.
Turn On:
The four second turn-on delay prevents dan-
gerous turn-on transients. Turn-on occurs at zero cross-
ing of the AC waveform, so power sequencers are rarely
needed with multiple units.
Note: The turn-on delay time
may be changed. Contact Crown’s Technical Support
Group for details.
Circuit Breaker:
Circuit breaker current ratings vary
based on the AC operating power.
