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Oxmoor

Oxmoor 4x4 Buffer Amplifier

$39.95

The Oxmoor 4x4 Buffer Amplifier is a professional, rack-mountable audio distribution amplifier and mixer designed to manage signal routing and level matching in sound reinforcement, broadcast, and recording environments. It features four electronically balanced inputs and four outputs, allowing any input to be routed to any or all outputs.

View Product Features
  • 4-channel buffer, mixer, and distribution amplifier.
  • Any input routes to any or all outputs.
  • Front-panel gain trims provide ±15 dB adjustment.
  • Internal jumpers prevent unauthorized configuration changes.
  • Electronically balanced XLR inputs and outputs.
  • Compact 1U chassis for rack mount installation.
In stock
14 in stock

Scroll below to see our current inventory for this item.

In-Stock Inventory

  •
    Used

    2101-73

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-74

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-75

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-76

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-77

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-78

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-79

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-80

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-81

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-82

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-83

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-84

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    2101-85

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product
  • Used

    1942-184

    Oxmoor 4x4 Buffer Amplifier

    Cosmetic Rating

    Fair

    "Fair Condition" gear exhibits noticeable signs of use, including moderate wear, scratches, and minor cosmetic damage. While some non-essential parts may be missing, these items are fully functional for key purposes. A great choice for those prioritizing functionality over appearance.
    $39.95
    View Product

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About the Oxmoor 4x4 Buffer Amplifier

The Oxmoor 4x4 Buffer Amplifier is a compact, 4-channel audio signal processor that functions as a buffer, mixer, and distribution amplifier within a single 1U rack-mountable chassis. Any of the four inputs can be assigned to any combination of the four outputs, providing exceptional routing flexibility for sound reinforcement, broadcast, recording, and fixed-installation applications. Two independent mixing buses enable signal combination either before or after the gain stages, allowing the unit to serve as a zone mixer, line driver, or level-matching interface between consumer hi-fi equipment and professional audio systems.

The front panel features screwdriver-adjustable gain trim potentiometers providing ±15 dB of level adjustment per channel, which may be assigned to either inputs or outputs via internal configuration. All signal routing and operating modes are configured using internal jumper blocks rather than front-panel controls, preventing unauthorized tampering with system settings while still delivering complete operational flexibility. Input and output stages are electronically balanced via standard 3-pin XLR connectors, with the optional 4x4T version incorporating output isolation transformers for enhanced ground isolation and noise rejection.

For demanding professional environments, the 4x4 includes RF suppression circuitry to guard against radio-frequency interference, making it suitable for broadcast facility use. The rugged steel and extruded aluminum chassis, UL and CE listings, and conservative component ratings ensure long-term reliability for both fixed installations and touring applications. Designed and manufactured in the United States by Oxmoor Corporation, the 4x4 delivers ruler-flat frequency response and ultra-low distortion, preserving audio fidelity across all routing configurations.

Key Features

  • 4-channel buffer, mixer, and distribution amplifier.
  • Any input routes to any or all outputs.
  • Front-panel gain trims provide ±15 dB adjustment.
  • Internal jumpers prevent unauthorized configuration changes.
  • Electronically balanced XLR inputs and outputs.
  • Compact 1U chassis for rack mount installation.

Oxmoor 4x4 Buffer Amplifier Specs

Oxmoor 4x4 Buffer Amplifier
Frequency Response
20 Hz to 20 kHz, +0, -0.3 dB
Bandwidth (-3 dB)
4 Hz to 70 kHz
Hum and Noise (ref +4 dBm)
-94 dB unweighted
THD + Noise (ref +4 dBm)
0.0016% (20 Hz to 20 kHz)
SMPTE Intermodulation Distortion
0.0021%
Transient Intermodulation Distortion
0.0031%
Channel-to-Channel Crosstalk
-80 dB (20 Hz to 20 kHz)
Audio Inputs
Input Type
Electronically balanced with RF suppression
Input Connectors
Female 3-pin XLR
Number of Inputs
4
Input Impedance
80 kΩ
Nominal Input Level
+4 dBu
Maximum Input Level
+24 dBu
Common Mode Rejection Ratio
50 dB at 1 kHz
Audio Outputs
Output Type
Electronically balanced
Output Connectors
Male 3-pin XLR
Number of Outputs
4
Source Impedance
150 Ω (75 Ω per side)
Recommended Load Impedance
600 Ω or greater
Maximum Output (600Ω load)
+24 dBm
Maximum Output (unterminated)
+26 dBu

Key Features

  • 4-channel buffer, mixer, and distribution amplifier.
  • Any input routes to any or all outputs.
  • Front-panel gain trims provide ±15 dB adjustment.
  • Internal jumpers prevent unauthorized configuration changes.
  • Electronically balanced XLR inputs and outputs.
  • Compact 1U chassis for rack mount installation.
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