FMX-42u 4 Channel Portable Mic/Line Mixer w/ USB Digital Audio Output – Azden


azden-logo-web  Mixers (Portable for Video / ENG )

4CH portable mixer with Digital output via USB

SKU: Az 77 Categories: , ,



  • Handcrafted in Japan
  • 2 Channel USB digital audio output
  • USB out connects to computer, smartphone or tablet
  • 4 balanced XLR line/mic inputs and pan controls
  • Switchable 48V phantom power and limiting
  • Professional quality VU meters
  • 2 balanced XLR outputs (line/mic switchable)
  • Stereo mini-jack output for DV cameras
  • 6x AA battery powered
  • Optional A/C adapter


handcrafted-in-japanAzden’s FMX-42 portable mixer has been trusted by audio professionals in the field for over a decade. Its extensive set of features, handcrafted quality and affordability have made it one of the most popular portable mixers on the market. Now with the new FMX-42u, Azden has added a USB digital audio output for even more flexibility.

The USB Out on the FMX-42u is designed to connect to a computer, smartphone or tablet and acts as a secondary stereo audio output (necessary USB cables and adapters are not included but readily available from electronics suppliers). This flexible feature could now allow you to use a mobile device or laptop computer as a backup digital recorder, use up to 4 XLR microphones while shooting video with a smartphone or tablet, or even use the FMX-42u as an in-studio mixer for web streaming or podcasting.

Of course the FMX-42u still boasts the many features of its predecessor, which include 4 balanced XLR line/mic inputs with individual level and pan controls, switchable (per channel) 48V phantom power and limiting, professional quality VU meters for accurate level setting, master level control, 1k tone generator, 2 balanced XLR outputs (line/mic switchable), stereo mini-jack output for DV cameras and a headphone output with level control.

The FMX-42u can be powered by either 6 internal “AA” batteries or an optional 12V DC external power supply (Azden part #BC-27H). A ballistic nylon carrying case is included.

In The Box

  • FMX-42u mixer
  • Nylon carrying case
  • Manual


  • General
    Frequency Response
    Balanced or Unbalanced Output: 20 Hz – 30 kHz (+0/-1.5 dB)
    Monitor Output: 30 Hz – 30 kHz (+0/-2 dB)
    Signal-to-Noise Balanced Output: -120 dBu (A weighted, input equivalent level)
    T.H.D. Balanced Output: < 0.005% @ 1 kHz (at LINE position +19 dBu output)
    Phantom Power Voltage: 48V (±1.5V)
    Sample Tone Frequency: 1 kHz
    Battery Requirement: 6 Alkaline “AA”
    External Power: 10.5 ~ 17V DC @ 200mA
    Dimensions: 220mmW x 160mmD x 56mmH (without protrusions)
    9″W x 6 1/2″ D x 2 1/4″H (without protrusions)
    Weight: 1.3 kg / 2.9 lbs (without batteries)
    Balanced Input: XLR 3-pin Female x 4 (CH1, 2, 3 & 4)
    Line Standard: +4 dBu (electronically balanced)
    Maximum: > +26 dBu
    Impedance: 20kΩ
    MIC HI Standard: -38 dBu (electronically balanced)
    Maximum: +4 dBu
    Impedance: 2kΩ
    MIC LO Standard: -58 dBu (electronically balanced)
    Maximum: -15 dBu
    Impedance: 2kΩ
    High Pass Filter (HPF): 100Hz – 6dB/oct
    Return Inputs (FMX-42a): Hirose 10-pin Female for Hirose Plug Part #RM15TD-10P
    3.5mm (1/8″) Stereo Mini-Jack
    Input Level: -20 dBu – +19 dBu (unbalanced)
    Impedance: 11kΩ
    Balanced Outputs: XLR 3-pin Male x 2 (Output L & R)
    Hirose 10-pin Female for Hirose Plug (FMX-42a only)
    Unbalanced Output: 3.5mm (1/8″) Stereo Mini-Jack
    Monitor Output: 6.3mm (1/4″) Stereo Jack
    Digital Signal Output (FMX-42u only): USB mini-B connector (female)
    Balanced Level Output
    +4 dBu LINE Standard: +4 dBu (electronically balanced, 5kΩ load)
    Maximum: +20 dBu (electronically balanced, 5kΩ load)
    Impedance: 600Ω
    -36 dBu MIC Standard: -36 dBu (electronically balanced, 5kΩ load)
    Maximum: -20 dBu (electronically balanced, 5kΩ load)
    Impedance: 600Ω
    Unbalanced Output Level Standard: -36 dBu (electronically balanced, 2kΩ load)
    Maximum: -20 dBu (electronically balanced, 2kΩ load)
    Impedance: 120Ω
    Monitor Output Max Output: +1 dBu (32Ω load at 9V)
    16-100Ω load recommended
    Meters Standard Output Level: 0 VU (+4 dBu)
    Interface Format: USB 2.0 Full Speed
    Audio Data Format: Isochronous Data Format
    Sampling Frequencies: 16 / 22.05 / 32 / 44.1 / 48 kHz Compatible
    Bit Depth: 8 / 16 bit Compatible
    Channels: 2
    Device Name: USB AUDIO CODEC