Fostex FM-3 3-Channel Input/2-Channel Output Portable Field Mixer

Priced: $1,999.00
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Fostex FM-3 3-Channel Input/2-Channel Output Portable Field Mixer -

The FM-3 Portable Mixer is a battery-powered 3 channel professional field mixer with an additional multi-pin auxiliary input and output and lots of other useful features. Designed for location work in video, film and remote recording situations, the FM-3 is packed with tools that will help you capture the highest quality audio in these demanding environments. Its organic LED display has adjustable brightness controls and informs you of the mixer's current settings, battery power and metering.
Most of the controls on the FM-3 have a dedicated hardware switch, knob, or button. The multi-pin auxiliary input can be sent to the stereo bus output, or used to cascade multiple mixers. In addition to the main XLR and multi-pin sub outputs, the FM-3 has two separate headphone outputs, a tape output and an auxiliary output. You can switch the audio being sent to the auxiliary output from channels 1 and 2, 2 and 3, 1 and 3 and stereo mix or mono mix.
The FM-3 operates on 8 AA batteries which slide in and out of the mixer in a magazine. You can also receive power from an external battery. The FM-3 features a handy DC output, so you can share its power with other equipment in your bag, such as a wireless receiver. Each channel has a variable high-pass filter knob, trim control, signal/peak LED, PFL button and pan switch. The master output level knobs, channel trims and filter knobs all can be set and pushed back into the mixer so they don't get accidentally adjusted.

Lining and Layers:

  • 3 channel input (line or mic) and 2 channel main outputs are equipped with high quality signal transformers to resist external noise


  • Light but robust aluminum body construction. The large solid aluminum fader knobs are exclusively machined for the FM-3
  • High quality faders offer superb reliability in severe work conditions. The faders use high-quality conductive plastic and a strong metal shaft construction


  • Highly visible Organic LED display with high resolution metering offering both VU and peak level, with the option of stereo or mono
  • The output has an analog limiter using VCA (the threshold and ratio parameters are adjustable)
  • Two headphone outputs are available with standard and mini jacks (you can choose a desired channel and PFL with the monitor selector knob)
  • The display will also show various mixer setting parameters, such as mic/line and phantom power on/off selections
  • Dedicated monitor return input to check the audio from VTR or camera feeds
  • The FM-3 runs on 8 AA batteries(it will also run on DC12-24V external power)
  • DC output is available via a HIROSE HR10A-4P connector, which is very useful for powering external devices such as a wireless receiver
  • Pop up knobs are used for trim, high pass filter and the master to avoid unwanted changes
  • Alkaline batteries will run for approximately 6 hours, the remaining battery capacity will be displayed on both the Organic LED display and an LED indicator
  • AUX input can also be merged to the stereo bus in addition to the monitoring feature (cascade connection is possible)
  • Main and sub outputs offer switchable level settings at +4/0/ -20/ -60
  • Sub output, tape output and AUX output (you can choose which channel to assign)
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AIN OUT (L, R):XLR-3-32 type (transformer balanced)
AIN OUT (L, R) Applicable load impedance:600 Ohm or more
AIN OUT (L, R): Nominal output level:+4, 0, -10 or -60 dBu (FM-4) / +4, 0, -20 or -60 dBu (FM-3) (switchable)
AUX IN:XLR-5-51 type (electronically balanced)
AUX IN: Input impedance:20 k Ohm or more
AUX IN: Nominal input level:+4 dBu
AUX OUT:Connector: ؁3.5mm stereo mini-phone jack (unbalanced)
AUX OUT: Applicable load impedance:10 k Ohm or more
AUX OUT: Nominal output level:-10 dBV or -60 dBV (switchable)
Applicable load impedance:8 Ohms or more
Crosstalk:-70 dB or less at 1kHz
DC IN:XLR-4-32 type (male), Input voltage: DC10V to DC 24V
DC OUT:Hirose 4 pin (female), Applicable plug: Hirose HR10A-7P-4P. DC7.2V - 24
Dimensions (WxHxD):210x57x156mm / 8.27x2.24x6.14" (Including protrusions)
External power supply:Optional AC adaptor (AD15C / AD15-4300)
FM-3 Input 1 through Input 3:XLR-3-31 type (transformer balanced)
Frequency response:Line In - Main Out: 20Hz to 20kHz +/- 1dB (reference level) MIC IN - Main Out: 40Hz to 20kHz +/- 1dB (reference level)
Headphones (32 Ohm load, 25mW o/p power):20Hz to 20kHz +/- 3dB
Headphones residual noise:-72 dBV or less (A-weighted) (Phones level control at minimum)
Internal batteries:Eight AA batteries (alkaline: 12V, nickel hydride: 9.6V)
Limiter:Attack time: approx 5 msec, Release time: approx 200 msec
Line input: Input impedance:10 k Ohm or more
Line input: Nominal input level:-20 dBu to +4 dBu
MIC input: Input impedance:2 k Ohm or more
MIC input: Nominal input level:-70 dBu to -30 dBu
MIC input: Phantom Power:P48V or T12V (selectable)
Phones:Connectors: 1/4" stereo phone jack and ؁3.5mm stereo mini-phone jack
Power requirement:DC7.2 to 12V
RTN IN:Connector: ؁3.5mm stereo mini-phone jack (unbalanced)
RTN IN: Input impedance:10 k Ohm or more
RTN IN: Nominal input level:-10 dBV
Ratio:3:1 or 5:1 (level and ratio can be selected using the status mode)
S/N ratio (A-weighted):Line (Input Gain: +4 dBu): 80dB or better MIC (Input Gain: -70dBu: 55dB or better (equivalent input noise: -125 dBu)
SUB OUT:XLR-5-52 type (electronically balanced)
SUB OUT: Applicable load impedance:10 k Ohm or more
SUB OUT: Nominal output level:+4, 0, -20 or -60 dBu (switchable)
TAPE OUT:Connector: ؁ 3.5mm stereo mini-phone jack (unbalanced)
TAPE OUT: Applicable load impedance:10 k Ohm or more
TAPE OUT: Nominal output level:-10 dBV
Threshold level:+6, +9 or +12dBu (FM-4) / +6 or +12dBu (FM-3) output level
Total harmonic distortion:Line: 0.1% or less at 1 kHz (Input Gain +4dBu) Mic: 0.1% or less at 1kHz (Input Gain -70dBu)
Weight:Approximately 1.2kg / 2.65lbs (not including the internal batteries)

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