Fostex FM-4 Portable Field Mixer

by Fostex
Fostex FM-4 Portable Field Mixer
4 XLR Mic/Line Inputs
2 Main Outputs with Custom Transformers
Phantom Power
Shelving and Parametric EQ
Pan Control and Fader Link
Organic LED Display
Peak and VU Metering
Tape, Aux, and Sub Outputs
Monitor Return Input
AA Batteries or External DC Power


Ultra-low noise preamps and custom transformers provide high-quality audio, ideal for EEP, broadcast, television, and film applications where performance and flexibility are of utmost importance.
The 4 balanced XLR inputs accommodate mic or line signals and offer 12T and 48V phantom power.
Switchable high shelving and mid sweep EQ provide tone customization.
Output options include 2 main outputs, 2 sub outputs, a tape output, and 2 aux outputs with channel select. The main and sub outputs can also double as 4 channels of direct post-fader output.
A dedicated monitor return input is included for referencing VTR or camera audio.
A highly-visible and easy-to-read organic LED display offers high-resolution metering with VU and Peak metering modes. It also shows battery level and currently selected operating mode.
Seamless pan control and a fader link function are built-in, and many of the controls are spring-loaded so they can be set and pushed back into the mixer so they don't get accidentally adjusted.
Operates on a set of 8 AA batteries that slide in and out of the mixer in a magazine. You can also receive power from an external DC10-24V power source.
A handy DC output lets you share power with other equipment.


Inputs -
4 x Balanced XLR (Mic/Line Switchable)
1 x 5-Pin AUX Input
1 x 3.5mm Stereo Mini Return Input
Output -
2 x Main/Direct Transformer-Balanced XLR Outputs
2 x 5-Pin XLR Sub/Direct Outputs
1 x 3.5mm Stereo Mini Tape Output
1 x 3.5mm Stereo Mini Aux Output
Monitor/Headphone Out -
1 x 1/4" Headphone Output
1 x 3.5mm Headphone Output
Frequency Response -
20Hz - 20kHz +/-1dB (Line In, Main Out)
40Hz - 20kHz +/-1dB (Mic In, Main Out)
20Hz -20kHz +/-3dB (Headphones)
Total Harmonic Distortion (THD) : < 0.1%
Limiter -
Attack : 5 milliseconds
Release : 200 milliseconds
Signal to Noise Ratio -
Line : 80dB or Better
Mic : 55dB or Better
Crosstalk : -70dB or Less
Filter - High Pass Filter : 40-200Hz, -12dB/Oct, Continuously Sweepable
Equalizer -
High : 10kHz Fixed, +/-12dB
Mid : 200Hz - 8kHz Variable, +/-12dB
Metering : Organic LED Display, Peak and VU
Phantom Power : T12, 48V
Power -
8 x AA Batteries (12V Alkaline, 9.6V NiMH)
7.2 to 12VDC Required
1 x 4-Pin XLR Male Power Input (10-24VDC)
1 x 4-Pin Hirose Female Output (Hirose HR10A-7P-4P. 7.2 to 24VDC) 1
Dimensions (WxHxD) : 274 x 57 x 180mm (10.8 x 2.25 x 7.1") (Including Protrusions)
Weight : 1.5kg (3.3 lbs) (Without Batteries)