Sound Ordnance USO-MIX3

PA system mixer

  • Sound Ordnance™ USO-MIX3


  • Sound Ordnance™ USO-MIX3


  • Sound Ordnance™ USO-MIX3

    Shown with Sound Ordnance PA System (not included)

Item #: 777USOMIX3
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Original price $149.99

Our take on the Sound Ordnance™ USO-MIX3

by Ralph Graves
Sound Ordnance

Need a simple audio mixer for your PA gear? Check out this compact, rack-mountable mixer from Sound Ordnance. Whether you're a musician, DJ, or just doing sound engineering for a club, wedding, or civic function, this mixer can get the job done — especially with the Sound Ordnance PA system.

Multiple inputs/outputs for versatility
Connect just about any audio source. The mixer has three stereo line-level RCA inputs for your components or portable devices, as well as a dedicated phono input. There's also a front-panel 1/4" jack for plugging in a microphone.

Outputs include stereo line-level RCA, as well as a pair of balanced XLR outputs for making lower-noise connections.

Simple controls for mixing sound
The mixer's input level controls let you adjust the volume of all inputs individually. And once you have your mix, use the main volume control to raise or lower the overall output from the mixer. You can also adjust the bass, midrange, and treble of your signal, for optimal frequency balance. And there's a peak level monitor so you know when the sound's getting too hot (volume-wise, that is).

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  • stereo mixer for Sound Ordnance PA system
  • displays and controls:
    • peak output level display
    • main volume control
    • input level controls
    • bass, midrange, and treble EQ controls
  • inputs:
    • 3 RCA stereo line-level inputs
    • phono input with ground
    • 1/4" front-panel jack for microphone
  • stereo RCA and balanced XLR outputs
  • selectable input voltage
  • detachable power cord
  • 19-1/16"W x 2"H x 8-13/16"D
  • weight: 6.7 lbs.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Product Research
What's in the box?

Download owner's manual

  • Audio mixer (1 mic/3 line)
  • 6.5' AC power cord
  • Two 6.5' XLR audio cables (with a male XLR connector on one end and a female XLR connector on other end)
  • Owner's Manual

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.



Overview: The Sound Ordnance USO Mixer (USO-MIX3) is intended for use in home and semi-professional audio systems, mixing and controlling low-level audio signal from a variety of different sources. Its a great addition to the Sound Ordnance PA System (sold separately).

Peak/Level Output Display: The front-panel Peak/Level Output Display indicates the device's output level. If the white display LED lights up, the output level is too high.

Main Level Control: The front-panel main level control sets the overall output level of the mixer.

Input Level Controls: The front-panel input level controls (Phone/Line1/Line2/Line3/Mic) set the level of the signal source connected to the corresponding input.

Bass/Mid/Treble Controls: The front-panel tone controls let you adjust the tonal output of the mixed audio signal with separate controls for the bass, midrange, and treble.

RCA Inputs: The Sound Ordnance USO Mixer has 3 stereo line-level inputs for use with devices, such as your CD player, MP3 player, or Tape deck.

Note: This audio mixer is only intended for use with line-level audio signal inputs.

Phono Input: The mixer features a rear-panel Phono input which lets you connect your turntable. Do not connect your turntable to the other RCA jack on this mixer. A Phono ground connection is available if your turntable has a ground cable.

Mic Input: A dynamic microphone with a 1/4" jack can be connected to the mixer's front-panel Mic input. There is a front-panel switch which turns the Mic input On or Off.

Note: When the Mic input is turned on, the mixer's Line 3 RCA input is disabled.

RCA/XLR Outputs: The Sound Ordnance USO Mixer is equipped with an unbalanced stereo RCA output and a balanced stereo XLR stereo output.  Either the RCA or XLR audio output will be connected to your amplifier. The RCA/XLR outputs are located on the rear-panel of the mixer.

Note: Do not connect both RCA/XLR outputs to  your amplifier.

Power Requirements: The audio mixer can operate on either 110-120 volt or 220-240 volt alternating current. The Input voltage is selectable. A 6.5' detachable AC power cord is supplied.

Indoor Use Only: The mixer is designed for indoor use and should not be exposed to damp or wet environments.


Input Impedance:

  • Line: 7.4 kOhm
  • Phono: .50 kOhm
  • Mic: > 50 kOhm

Input Sensitivity:

  • Line: 1.93 V
  • Phono: 24.5 mV
  • Mic: 17.5 mV

Output Impedance:

  • RCA: 8.6 V with 10 kOhm
  • XLR: 2.5 V with 600 Ohm

Frequency Response: 10-25,000 Hz

S/N Ratio: 90 dB

THD: 0.001 %

Channel Separation: 81 dB

Operation Voltage: 110-120 V, 50-60 Hz or 220-240 V, 50-60 Hz

Power Consumption: 5 watts

Fuse: T 100 mA/250 V (5 x 20mm); 110-120 V system

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