AtlasIED FM250-4

Features

Overview: The Atlas FM250-4 is an amplifier module is designed to work specifically with the Atlas F6-MF power rack, which can hold up to 6 modules. The FM250-4 module can output 250 watts, features a defeatable Limiter and a High-Pass Filter, and can power both 4 and 8 ohm speakers. It's Class-D amp technology is designed to be 90% efficient, allowing the amp to run cooler and consume less energy than conventional amplifiers.

Installation: The FM250-4 module includes a multi-terminal strip on the rear of the PC board that lines up with a contact slot on the F6-MF power rack. The card is then secured in place with 2 front panel screws. Signal input to the card is through the rack, which has six 3-pin Euroblock connectors on the back of it, along with Level dials for each channel. The front of the module includes a 2-pin Euroblock connector for connecting a 4 Ω or 8 Ω speaker load. If powering speakers in a 70.7 volt system, the FM250-70 module can be used. This installs into the F6-MF power rack in the same manner and provides the same power output for running 70 volt speakers.

Settings: The FM250-4 module includes a 3-setting DIP switch on the rear of the module which includes:

• DIP Switch 1: This switch changes the Input Sensitivity
  • On: Sensitivity is 1 volt
  • Off: Sensitivity is 2 volts
• DIP Switches 2&3: Activates the High-Pass Filter
  • On: When both switches are On, a 100 Hz / 12 dB per octave High-Pass Filter is engaged.
  • Off: Both switches Off allows a full-bandwidth signal to pass

Status Indicators: The front of the module includes 4 Status LEDs for the following:

• Ready: Will light green when the FM250-4 power module is installed and the F6-MF is powered on.
• Signal: Will light green when the FM250-4 amp module's output signal produces a minimum 1 watt signal.
• Limit: If the FM250-4 amp module's function switch is set to Limit, the the LED will light yellow acting as a maximum level indicator. If the amp module's Limit function is off, the LED acts as a Clip indicator. Also, under low impedance loads, the LED serves as a current Limit indicator.
• Protect: Will light red to indicate a speaker short, too high internal temperature, or too low of a speaker impedance.

Specifications:

• Output Power, Burst power @ 1 kHz, ultra fast recovery power supply:
  • 8Ω:
    • 1 Channel: 150 Watts
    • 2 Channels: 140 Watts each
    • 6 Channels: 125 Watts each
  • 4Ω:
    • 1 Channel: 300 Watts
    • 2 Channels: 280 Watts each
    • 6 Channels: 250 Watts each
• Continuous Power @ 1 kHz
  • 8Ω:
    • 1 Channel: 135 Watts
    • 2 Channels: 125 Watts each
    • 6 Channels: 95 Watts each
  • 4Ω:
    • 1 Channel: 270 Watts
    • 2 Channels: 250 Watts each
    • 6 Channels: 170 Watts each
• Frequency Response: 30 Hz - 20 kHz
• Signal to Noise Ratio: -90 dB below rated output
• Dimensions: Width - 1.5", Height - 3.4", Depth - 10.4"
• Weight: 0.8 lbs.