Macro-Tech Series

MA-2402 Specifications

MA-2402 Power Output

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.

Required AC Mains: 50/60 Hz; 100, 120, 220 and 240 VAC (10%) units are available. All draw 100 watts or less at idle. Current, voltage and frequency requirements are provided on the units back panel.

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 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 rotary control for each channel with 31 detents 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 1kHz power, or a 26 dB voltage gain.

Reset: A back panel push button for each channel used to reset the circuit breaker that protects each power supply.

Input Ground Lift: This switch on the PIP2-FXQ is used to isolate input signal grounds from chassis ground to prevent ground loops.

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 indicator that flashes to show amplifier output. If a channels 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: Each channel has an amber front panel indicator 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 phone jacks on the back panel and two balanced three-pin female XLR connectors on the factory-installed PIP2-FXQ.

Input Impedance: Nominally 20 k ohms, balanced. Nominally 10 k ohms, unbalanced.

Input Sensitivity: Settings include 0.775 volts or 1.4volts 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 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 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.

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 (6.3- cm) protrusion in front of the mounting surface.

Approximate Weight: Center of gravity is 6inches (15.2cm) behind front mounting surface.
120 VAC, 60 Hz Units:

  • Macro-Tech 2402: 51pounds, 12 ounces (23.5kg) net; 65 pounds (29.5 kg) shipping weight. 

International Units:

  • Macro-Tech 2402: 48pounds, 15 ounces (22.2kg) net; 57 pounds, 6 ounces (26.0 kg) shipping weight.