Crown Audio Macro-Tech MA-5000VZ - Manual (Page 33)

Page 34
Macro-Tech 5000VZ Power Amplifier
Reference Manual
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
blowups. They also protect loudspeakers from input/
output DC and turn-on/turn-off transients.
If unreasonable operating conditions occur, the pat-
ented
ODEP circuitry will proportionally limit the drive
level to protect the output transistor stages, particularly
in the case of elevated temperature. Transformer over-
heating will result in a temporary shutdown of the af-
fected channel; when it has cooled to a safe temperature,
the transformer will automatically reset itself. Controlled
slew rate voltage amplifiers protect against RF burnouts.
And input overload protection is provided by the input
compressors and current-limiting resistance at the in-
put.
Turn On: The four second turn-on delay prevents dan-
gerous turn-on transients. (Contact Crown’s Technical
Support Group to change the delay time.) It also has
“soft start” to avoid tripping the AC circuit breaker by
gradually bringing the supplies up to full voltage.
Construction
Steel chassis with durable black finish, aluminum front
panel with Lexan overlay, and specially designed flow-
through ventilation from front to back panels.
Cooling: Internal heat sinks with on-demand, propor-
tional forced-air cooling controlled by
ODEP. Includes
custom heat diffusers and patented circuitry to promote
uniform dissipation.
Dimensions: 19 inch (48.3 cm) standard rack mount
width (EIA RS-310-B), 5.25 inch (13.3 cm) height,
15.875 inch (40.3 cm) depth behind mounting surface,
and 2.875 inches (7.3 cm) in front of mounting surface.
Allow 3 inches (7.6 cm) behind the back panel for ad-
equate air flow (see Figures 3.1 and 3.2).
Approximate Weight: 77 pounds, 9 ounces (35.2 kg)
net; 88 pounds, 10 ounces (40.2 kg) shipping weight.
reserve energy. In the rare event that a channel has no
reserve, its indicator will dim in proportion to
ODEP lim-
iting. An ODEP indicator may also turn off under other
conditions (see Section 4.2).
I Load / I Limit : Each channel has a two-color (green/red)
indicator that shows load current and limit current. They
glow green to indicate load current flowing out the am-
plifier, and they turn red when maximum current is be-
ing delivered to the load.
Input/Output
Input Connectors: Balanced three-pin XLR connec-
tors and balanced phone jacks are provided on the
factory-installed PIP2-FXQ (see Section 8.1 for op-
tional
PIP modules).
Input Impedance: Greater than 10 K ohms, balanced.
Greater than 5 K ohms, unbalanced.
Input Sensitivity: Settings include 0.775 volts or
1.4 volts for standard 1 kHz power, or a 26 dB voltage
gain (see Section 4.4 for more information).
Output Connectors: A multifunction, high-current
output block is provided. Crown output blocks include
three pairs of connectors for each channel (a total of
12 connectors). This allows multiple loudspeakers to
be easily connected to each channel. High current
screw terminals and banana jacks are provided which
accept spade lugs, banana plugs or bare wire.
Output Impedance: Less than 10 milliohms in series
with less than 2.5 microhenries (see Figure 6.5).
DC Output Offset: ±10 millivolts.
Output Signal
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel. Channel 1
controls are active; Channel 2 controls are removed
from operation.
Parallel-Mono: Unbalanced, single-channel. Channel
1 controls are active; Channel 2 controls are removed
from operation.