Fostex AR501 Mic Preamplifier for DSLR Audio

Special Price $349.99 Regular Price $399.00
No Longer Available


  • Camera Mountable
  • 48V Phantom Power
  • XLR Input & Output
  • Attenuable 3.5mm Output
  • Selectable Input Gain Level
  • Selectable High-Pass Filter
  • Aluminum Chassis
  • Powered by 1x AA Battery



The AR501 Mic Preamplifier for DSLR Audio from Fostex is a camera-mountable mic preamp that offers 48-volt phantom power and can be used for location recording, ENG, and installation applications. It features a balanced XLR input and output in addition to an unbalanced 3.5mm output connector that can be attenuated -10 or -50 dBV for connecting to your camera's mic level input. 

The AR501 is powered by a single AA battery and supports three selectable input gain levels. An integrated and selectable high-pass filter can be engaged at 80 or 160 Hz to help eliminate low-frequency rumble. The included joint plate allows you to cascade 2 AR501s for stereo use.

  • Selectable mic input gain level, -20 / -30 / -45 / -60 dBu
  • HPF at 80 or 160 Hz with -6 dB/octave
  • Cascading function for stereo application with a supplied dedicated joint plate
  • Balanced Out (4 dBu, XLR) and Unbalanced Out (-10 dBV or attenuated -50dBV, stereo mini)
  • Peak LED and Power LED that doubles with low battery warning
  • Powered by 1x AA battery for 10 hours operation (approximately 4 hours with 48 V on) or DC-IN (5 V, Micro USB)
  • Power saving mode (phantom power down to 24 V) to extend the operation hours
  • Extruded aluminum chassis
  • Shoe rails for various camera rigs and a tri-pod compatible screw hole
  • Stereo mini OFC cable included for DSLR connection or cascading to another unit


More Information
Stock Status No Longer Available
Manufacturer Fostex
Mfr Part No AR501
Color No
Condition No
Refundable / Cancelable? Yes

Analog Input

1x XLR-3-31; electrically balanced, 2-hot

Input Reference Level: 4 dBu
Maximum Input Level: 24 dBu

Input Reference Level -60, -45, -30, -20 dBu
Maximum Input Level: 0 dBu

Phantom Power: DC 48 V, +/- 4 V (10 mA), DC 24 V (in energy saving mode)

Analog Output

Balanced Connector: XLR-3-32, electrically balanced, 2-hot
Input Impedance: 10 kΩ or more
Reference Output Level: 4 dBu
Maximum Output Level: 24 dBu (20 dBu in energy saving mode)


Unbalanced: 1/8" (3.5 mm) stereo mini jack (for dual mono)
Reference Output Level: -10 dBV (ATT On: -50 dBV)
Maximum Output Level: 10 dBV (ATT On: -30 dBV)

High-Pass Filter

-6 dB/Octave @ 80 or 160 Hz (switchable)

Frequency Response

Mic In/Out, Reference Level, Gain Low: 20 Hz to 20 kHz, +/-1 dB 
Mic In/Out, Reference Level, Gain High: 20 Hz to 20 kHz, +/- 3 dB

Signal to Noise Ratio

Gain High: 60 dB or higher


Gain High @ 1 kHz: Less than 0.1%

Power Requirements

1x AA Battery (Alkaline or Ni-MH)
DC In, 5 V

Power Consumption

0.6 W (maximum)

Dimensions (W x H x D)

1.6 x 1.2 x 4.5" (42.8 x 31.6 x 116 mm)


4 oz (110 g), approximate 
With Battery: 5 oz (150 g), approximate


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