These specifications apply to 120 VAC units in
stereo mode with 8 ohm loads and an input sensitivity of
26dB unless otherwise specified.
120 VAC, 60 Hz Units:
These units are equipped with transformers rated for 120
VAC, 60 Hz power.
International Units: These units are
equipped with transformers for either 100 VAC, 50/60 Hz, or
230 VAC, 50/60 Hz power.
Power
Output Power: The following are guaranteed
minimums for standard 1-kHz power from 120 VAC, 60 Hz North
American units. Maximum average watts per channel (unless in
Mono mode) at 1 kHz with 0.1% or less THD.
Stereo mode with both channels driven:
1800 watts into 2 ohms.
1565 watts into 4
ohms.
1120 watts into 8 ohms.
Bridge-Mono mode:
3505 watts into 4
ohms.
3140 watts into 8 ohms.
Parallel-Mono mode:
3555 watts into 1
ohm.
3190 watts into 2 ohms.
Load Impedance: Rated for 16, 8, 4, and 2
ohm use only. Safe with all types of loads, even reactive ones.
AC Power Requirements: 100 VAC, 50/60 Hz;
120 VAC, 50/60 Hz; and 230 VAC, 50/60 Hz units are
available. 230 VAC, 50/60 Hz units can be used with 220 and
240 VAC. All versions draw 90 watts or less at idle. 100 and
120 VAC units can draw up to 30 amps of current; 230 VAC
units can draw up to 15 amps.
Performance
Frequency Response: 0.1 dB from 20 Hz to 20
kHz at 1 watt.
Phase Response: 10 from 10 Hz to 20 kHz at
1 watt.
Signal-to-Noise Ratio: Greater than 105 dB
below rated output (20 Hz to 20 kHz, A-weighted); 100 dB
below rated output (20 Hz to 20 kHz, no weighting).
Harmonic Distortion (THD): At rated output,
less than 0.05% from 20 Hz to 1 kHz increasing linearly to
less than 0.1% at 20 kHz.
IM Distortion (IMD): Less than 0.05% from
368 milliwatts to full rated output.
Damping Factor: Greater than 1,000 from 10
Hz to 400 Hz.
Slew Rate: Greater than 30 volts per microsecond.
Voltage Gain: (At maximum output) 20:1 6%
or 26 dB 0.25 dB at +26 dB gain setting, and 124.6:1 6% or
41.9 dB 1.0 dB at 0.775 volt sensitivity.
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 control the output level.
Stereo/Mono: A three-position back panel
switch used to select Stereo, Bridge-Mono or Parallel-Mono operation.
Sensitivity: A three-position switch
located inside the PIP 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
supply is operating.
Signal / IOC: Two green indicators flash
with medium intensity in sync with the amplifiers outputs to
show signal 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
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 channels
energy 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.
Input/Output
Input Connector: Balanced -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 (unbalanced) for rated output or a fixed voltage gain of
26 dB.
Output Connector: Color-coded dual binding
posts (banana jacks).
Output Impedance: Less than 10 milliohms in
series with less than 2 microhenries
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 patented 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 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 dangerous 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 Crowns Technical Support Group for details.
Circuit Breaker: Circuit breaker current ratings vary based
on the AC operating power.
Construction
Durable black powder coated steel chassis and aluminum front
panel with Lexan overlay; specially designed flow-through
ventilation from front to side panels.
Cooling: Forced-air with custom heat
diffusers and patented circuitry to promote uniform dissipation.
Dimensions: 19 inch (48.3 cm) standard rack
mount (EIA Std. RS-310-B), 3.5 inch (8.9 cm) height, 16 inch
(40.6 cm) depth behind mounting surface and 2.5 inches (6.4
cm) in front of mounting surface.
Weight: Center of gravity is 6 inches (15.2
cm) behind the front mounting surface.
120 VAC, 60 Hz Units:
Net weight 55
lbs, 1.5ounces (25.0kg); shipping weight 63lbs, 10ounces (28.9 kg).
100 VAC International Units:
Net weight 54 lbs, 5ounces (24.7kg); shipping weight
63lbs, 0.5ounces (28.6 kg).
120 VAC International Units:
Net weight 55 lbs, 1.5ounces (25.0kg); shipping weight
63lbs, 10ounces (28.9 kg).
230 VAC International Units:
Net weight 53 lbs, 6ounces (24.2kg); shipping weight
61lbs, 15ounces (28.1 kg).
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