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AtlasIED F6-MF

Mainframe chassis for F6 amplifier system

Item # 978F6MF

Load it with amp modules to provide paging and background music in large multi-zone systems like hotels, and hospitals.

Load it with amp modules to provide paging and background music in large multi-zone systems like hotels, and hospitals.

California customers:
Please click here for your Proposition 65 warning.


About the AtlasIED F6-MF

Get a free system design

After we gather your information, we’ll send you a detailed system plan. It will include a link to a pre-filled shopping cart. Ordering is easy, and delivery is fast.

Up to six amplifiers in one main frame

Atlas Sound's F6 Amplifier Mainframe System consists of a power supply, input, signal routing, and control mainframe support unit, with slots for six 250-watt amplifier modules and an 8-channel mixer (all sold separately). When loaded, the F6 Main Frame becomes an extremely versatile and powerful amplifier system capable of handling paging and background music in large multi-zone applications like office buildings, hotels, and hospitals.

Customize your amplifier applications

Because of its modular nature, you can configure your F6-MF with just the right number of amplifiers you need at first, and then add modules later as your business or institution grows. Two kinds of amp modules are offered: the FM250-4 module for 4- or 8-ohm speakers, and the FM250-70 module for use in 70-volt distributed power speaker systems. An optional mixer module adds two inputs, distribution, and muting control to the system.

Mainframe features

The rack-mountable F6-MF features front-panel status LEDs and level controls for the six amplifier channels. A cooling fan ensures that the 250-watt amplifier modules won't overheat. The power supply uses a special technology to direct all available energy to the channels that need it the most, increasing the amplifier system's overall efficiency.

Atlas Sound F6-MF

Atlas Sound's F6-MF fully loaded with six FM250-70 amplifiers and an F6-AMIX mixer (rear view)

See what our satisfied customers have to say.

Product highlights:

  • mainframe for Atlas Sound F6 modular amplifier system
  • can accommodate up to six FM250-4 or six FM250-70 250-watt amplifier modules
  • optional F6-AMIX 8-channel mixer module adds inputs and routing options
  • front-panel channel status LED indicators and level controls
  • security cover for front controls included
  • cooling fan
  • Power Rail Direct Coupling™ (PRDC) power supply technology improves efficiency
  • rack-mountable
  • dimensions: 19"W x 3"H x 15-1/2"D
  • weight: 21 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # F6-MF

What's in the box:

  • Amplifier mainframe system

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More details on the AtlasIED F6-MF

Russ B.

Product Research


Overview: The Atlas F6 Amplifier Mainframe System is a versatile, multi-channel, modular amplifier that can be configured for both 4/8Ω and 70.7 volt applications.

Mainframe: The F6 features 6 input channels, via 3-pin Euroblock (Phoenix) connectors, along with a module bay that can hold up to 6 optional amplifier output modules (sold separately). It also includes a universal power supply that's designed to be used in either 110-120V and 230-240V regions. The F6 features an internal fan that directs air from the rear intake out the front vents. The front panel includes individual Level controls for each of the 6 inputs, along with a tamper-proof cover plate to keep levels from being inadvertently changed. Turning any of the Level controls fully to the left will completely attenuate the output signal. When turned all the way to the right, the amp is outputting it's maximum level. The front panel also includes Status LEDs for each of the 6 input channels:

  • Ready: Will light green when an FM250 power module is installed in that slot and the F6 is powered on.
  • Signal: Will light green when an FM250 amp module's output signal produces a minimum 1 watt signal.
  • Limit: If an FM250 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.

Three other front panel System LEDs are provided for:

  • Power: Indicates On or Off.
  • Temp: This LED will light yellow if any of the amp modules reach 10% of their Thermal Protect shut off and the cooling fan is at its maximum cooling capacity.
  • Protect: This LED will light red and the output will shut of if any of the following are detected: Shorted speaker output, Thermal shut down, Current Overdrive, if the amp channel is driving too low a speaker impedance.

Modules: Each of the FM250 amp modules outputs 250 watts and comes in 2 models: FM2504 for driving 4 or 8 Ω speakers, and the FM25070 for 70.7 volt applications. Both designs feature a defeatable limiter and a high-pass filter. Their ultra-efficient Class D amplification technology is designed to be 90% efficient, allowing the amp to run cooler and consume less energy than conventional amplifiers. The F6 can also accommodate the F6-AMIX add-on mixer card (sold separately). This feature laden module is an 8 input, 6 output mixer that adds both summed stereo and mic/line inputs with global assignment, signal mixing, and remote level and mute functionality.


  • Chassis: 6 Channel main frame
  • Compatible Modules: FM250-4 & FM250-70 (sold separately)
  • Output Power with FM250-4 Installed, 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 @ 1kHz
    • 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
  • Output Power with FM250-70 Installed, Burst power @ 1 kHz, ultra fast recovery power supply:
    • 1 Channel: 300 Watts
    • 2 Channels: 280 Watts each
    • 6 Channels: 250 Watts each

      Continuous Power @ 1kHz, 30 mins.
    • 1 Channel: 270 Watts
    • 2 Channels: 250 Watts each
    • 6 Channels: 170 Watts each
  • THD + Noise: 30 Hz - 20 kHz, +0/-1.5 dB, typically <0.2%, 1 kHz, at rated output
  • Frequency Response: 30 Hz - 20 kHz (+/- 1 dB) Fixed 30 Hz high-pass filter
  • Signal to Noise Ratio: -90 dB Below rated output (weighted)
  • Input Sensitivity: Selectable per channel - 1V or 2V
  • Voltage Gain: 30 dB per channel
  • Input Impedance: Balanced 20 kΩ
  • Cooling: Fan assisted, rear intake, front exhaust
  • Power Delay On: 1 - 2 sec.
  • Power Requirement: Global selection, 103V - 127V or 207V - 253V
  • Power Consumption (120VAC):
    • Standby: 5 Watts
    • F6-MF w/ 6 Channels Loaded:
      • Max: 1650 Watts, 14A
      • Average: 550 Watts, 4.5A
      • Idle: 16 Watts, 130mA
  • Dimensions: Width - 19.0", Height - 3.0", Depth - 15.5"
  • Weight: 21 lbs.

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