| Specifications: |
Power
- Load Impedance: Safe with all types of loads. Rated for 2 to 16 ohms in Stereo, 4 to 16 ohms in Bridge-Mono and 1 to 4 ohms in Parallel-Mono mode.
- Voltage Gain at 1 kHz, 8 ohm rated output:
- MA-602:
54:1 ±6% or 35 dB ±0.5 dB at 0.775 volt sensitivity.
30:1 ±6% or 30 dB ±0.5 dB at 1.4 volt sensitivity.
20:1 ±6% or 26 dB ±0.5 dB at 26 dB gain at the maximum level setting.
- MA-1202:
64:1 ±6% or 36 dB ±0.5 dB at 0.775 volt sensitivity.
36:1 ±6% or 31 dB ±0.5 dB at 1.4 volt sensitivity.
20:1 ±6% or 26 dB ±0.5 dB at 26 dB gain at the maximum level setting.
- MA-2402:
83:1 ±6% or 38 dB ±0.5 dB at 0.775 volt sensitivity.
46:1 ±6% or 33 dB ±0.5 dB at 1.4 volt sensitivity.
20:1 ±6% or 26 dB ±0.5 dB at 26 dB gain at the maximum level setting.
- Required AC Mains: 50/60 Hz; 100, 120, 220 and 240VAC (±10%) units are available. All draw 100 watts or less at idle. Current, voltage and frequency requirements are provided on the unit’s back panel.
- AC Line Connector:
MA-602 and MA-1202: NEMA5-15P (15A)
MA-2402: NEMA 5-20P (20A)
Performance
- Frequency Response: ±0.1 dB from 20 Hz to 20 kHz at 1 watt.
- Phase Response: ±10 degrees from 10 Hz to 20 kHz at 1 watt.
- Signal-to-Noise Ratio:
A-weighted: Better than 105 dB below rated full bandwidth power.
20 Hz to 20 kHz: Better than 100 dB below rated full bandwidth power.
- Total Harmonic Distortion (THD) at full-bandwidth power: Less than 0.05% from 20 Hz to 1 kHz increasing linearly to 0.1% at 20 kHz.
- Intermodulation Distortion (IMD): (60 Hz and 7 kHz at 4:1) Less than 0.05% from 163 milliwatts to full bandwidth power.
- Damping Factor: Greater than 1,000 from 10 Hz to 400 Hz.
- Slew Rate: (Slew rates are limited to useful levels for ultrasonic/RF protection.) Greater than 13 volts per microsecond.
Controls
- Enable: A front-panel push button used to turn the amplifier on and off.
- Level: A front-panel 31-detent rotary control for each channel used to control the output level.
- 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 PIP™ compartment used to select the input sensitivity for both channels: 0.775 volts or 1.4 volts for standard 1 kHz power, or a 26 dB voltage gain.
- Reset (MA-2402 only): A back-panel push button for each channel used to reset the circuit breaker that protects each power supply.
Indicators
- Enable: An amber front-panel indicator that shows the on/off status of the low-voltage power supply.
- Signal/IOC: A green front-panel indicator for each channel that flashes to show amplifier output. If a channel’s output 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.
- ODEP: An amber front-panel indicator for each channel that shows thermal-dynamic energy reserve. Normally, each ODEP indicator is lit to show available reserve energy. 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.
Input/Output
- Input Connector: Two balanced 1/4-inch (6.35- mm) phone jacks on the back panel and two balanced three-pin female XLR connectors on the factory-installed PIP2-FXQ.
- Input Impedance (Nominal): 20 k ohms, balanced; 10 k ohms, unbalanced.
- Maximum Input Level: 9 Vrms.
- Input Sensitivity: 0.775 volts for standard 1 kHz power, 1.4 volts for standard 1 kHz power, or a 26 dB voltage gain.
- Output Connectors: Two sets of color-coded 5-way binding posts (for banana plugs, spade lugs or bare wire).
- 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 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; excessive emperature; 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 result 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 amplifiers prevent RF burnouts. And input overload protection is provided by current-limiting resistance at the input.
- Turn On: Four-second delay with no dangerous transients. Delay time can be changed (contact Crown’s Technical Support Group).
Accessories
- Crown PIP and PIP2 modules including IQ-PIP
modules, which allow networking via HiQnet or TCP/IQ.
Construction
- Steel chassis with durable black power-coat 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: EIA Standard 19-inch (48.3-cm) rack mount width (EIA RS-310-B), 3.5 inches (8.9 cm) high, 16 inches (40.6 cm) deep behind the mounting surface and 2.5-inch (6.3-cm) protrusion in front of the mounting surface.
- Weight:
MA-602: 39 lb, 9 oz (17.9 kg) net.
44 lb (19.9 kg) shipping weight.
MA-1202: 44 lb, 1 oz (20.0 kg) net.
47 lb (21.3 kg) shipping weight.
MA-2402: 51 lb, 12 oz (23.5 kg) net.
65 lb (29.5 kg) shipping weight.
Center of gravity is 6 inches (15.2 cm) behind
front mounting surface.
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