Fostex AR501 Mic Preamplifier for DSLR Audio

Our Price $349.99 Regular Price $399.00
No Longer Available

$0.00 Tax Outside NY and NJ 


  • 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



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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
Condition New
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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