Technical information

Macro-Tech 3600VZ Power Amplifier
Page 29
Controls
Enable: A front panel push button used to turn the
amplifier on and off.
Level: A 31-position detented rotary attenuator for
each channel located on the front panel used to con-
trol 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
P.I.P. compartment used to select one of three input
sensitivities 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
signal presence. In the unlikely event the output wave-
form differs from that of the input by 0.05% or more,
they flash brightly to indicate distortion. As sensitive
distortion 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 a multifunction LED (light
emitting diode) indicator that shows the channel’s en-
ergy reserve status. Normally, the LEDs are brightly lit
to show that reserve energy is available. In the rare
event that a channel has little reserve, its indicator dims
in proportion to ODEP limiting. An ODEP indicator may
also turn off under other, more unusual circumstances
(see Section 4.2).
Input/Output
Input Connector: Balanced ¼-inch phone jacks on
chassis and internal P.I.P. 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 (un-
balanced) 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 sup-
plies; excessive temperature, chain destruction phe-
nomena, 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 re-
sults in a temporary shutdown of the offending chan-
nel. When it has cooled to a safe temperature, the
transformer automatically resets itself. Controlled slew
rate voltage amplifiers protect against RF burnouts,
and input 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
crossing 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 Techni-
cal Support Group for details.
Circuit Breaker: Circuit breaker current ratings vary
based on the AC operating power.