Technical information

Macro-Tech 600/1200/2400 Power Amplifiers
Page 28
Stereo/Mono: A three-position back panel switch used to
select Stereo, Bridge-Mono or Parallel-Mono mode.
Sensitivity: A three-position switch inside the
P.I.P. com-
partment used to select the input sensitivity for both chan-
nels: 0.775 volts or 1.4 volts for standard 1 kHz power, or a
26 dB voltage gain.
Ground Lift: A two-position back panel switch for isolat-
ing the phone jack input grounds from the AC ground.
Reset (
Macro-Tech 2400 only): A back panel push but-
ton for each channel used to reset the circuit breaker that
protects each power supply.
Indicators
Enable: This amber front panel indicator shows the on/off
status of the low-voltage power supply.
Signal/
IOC: Each channel has a green front panel indica-
tor that flashes to show amplifier output. If a channel’s out-
put waveform differs from its input by 0.05% or more, the
indicator flashes brightly to show distortion. This function
provides proof of distortion-free performance . In Parallel-
Mono mode, the Channel 2 light stays on (see Section 4.2).
ODEP: Each channel has an amber front panel indicator
that shows thermal-dynamic energy reserve. Normally,
each ODEP indicator is lit to show available reserve en-
ergy. In the rare event that a channel has no reserve, its
indicator will dim in proportion to ODEP limiting. An ODEP
indicator may also turn off under other conditions (see Sec-
tion 4.2).
Input/Output
Input Connector: Two balanced
1
¦4-inch phone jacks on
the back panel and two balanced three-pin female XLR
connectors on the factory-installed P.I.P.-FX (see Section 8
for information on optional P.I.P. modules).
Input Impedance: Nominally 20 K ohms, balanced. Nomi-
nally 10 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: Two sets of color-coded 5-way bind-
ing posts (for banana plugs, spade lugs or bare wire).
Output Impedance: Less than 10 milliohms in series with
less than 2 microhenries (see Figure 6.9).
DC Output Offset: (Shorted input) ±10 millivolts.
Output Signal
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel. Channel 1 con-
trols are active; Channel 2 should not be used.
Parallel-Mono: Unbalanced, single-channel. Channel 1
controls are active; Channel 2 controls are bypassed.
Protection
Macro-Tech amplifiers are protected against shorted, open
or mismatched loads; overloaded power supplies; exces-
sive temperature, chain destruction phenomena, 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 patented
ODEP circuitry will proportionally limit the drive level to
protect the output transistor stages, particularly in the case
of elevated temperature. Transformer overheating will re-
sult in a temporary shutdown of the affected channel; when
it has cooled to a safe temperature, the transformer will
automatically reset itself. Controlled slew-rate voltage am-
plifiers prevent RF burnouts. And input overload protec-
tion is provided by current-limiting resistance at the input.
Refer to Section 4.3.
Turn On: Four-second delay with no dangerous transients.
Contact Crown’s Technical Support Group to change the
turn-on delay time.
Construction
Steel chassis with durable black finish, aluminum front
panel with Lexan overlay, and specially designed flow-
through ventilation from front to side panels.
Cooling: Internal heat sinks with forced-air cooling for
rapid, uniform heat dissipation.
Dimensions: Standard 19 inch (48.3 cm) rack mount
width (EIA RS-310-B), 3.5 inch (8.9 cm) height, 16 inch
(40.6 cm) depth behind the mounting surface and 2.5 inch
(6.35 cm) protrusion in front of the mounting surface.
Approximate Weight: Center of gravity is 6 inches
(15.2 cm) behind front mounting surface.
120 VAC, 60 Hz Units:
Macro-Tech 600 : 39 pounds, 9 ounces (17.9 kg) net;
44 pounds (19.9 kg) shipping weight.
Macro-Tech 1200 : 44 pounds, 1 ounce (20.0 kg) net;
47 pounds (21.3 kg) shipping weight.
Macro-Tech 2400 : 51 pounds, 12 ounces (23.5 kg) net;
65 pounds (29.5 kg) shipping weight.
International Units:
Macro-Tech 600 : 41 pounds, 15 ounces (19.0 kg) net;
46 pounds (20.9 kg) shipping weight.
Macro-Tech 1200 : 42 pounds, 12 ounces (19.4 kg) net;
46 pounds, 13 ounces (21.3 kg) shipping weight.
Macro-Tech 2400 : 48 pounds, 15 ounces (22.2 kg) net;
57 pounds, 6 ounces (26.0 kg) shipping weight.