• handcrafted-in-japan Azden’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 LOStandard: -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)
    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 dBuLINEStandard: +4 dBu (electronically balanced, 5kΩ load)
    Maximum: +20 dBu (electronically balanced, 5kΩ load)
    Impedance: 600Ω
    -36 dBuMICStandard: -36 dBu (electronically balanced, 5kΩ load)
    Maximum: -20 dBu (electronically balanced, 5kΩ load)
    Impedance: 600Ω
    Unbalanced Output LevelStandard: -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
    MetersStandard 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

    • 1.Mixers
    • Do Azden mixers provide phantom power?

      Yes, all of Azden’s FMX mixers have phantom power, switchable on & off for each channel.

    • What kind of outputs do Azden mixers provide, line level or microphone level?

      All of Azden’s mixers can output microphone level. With the FMX-42u and 42a you have the additional ability to output line level if needed.

    • How do I know which Azden mixer is right for me?

      First consider the kind of outputs you need for your camera. Azden’s FMX-42a, 42u, 32a and 22 have both XLR outputs and 3.5mm mini-jack stereo outputs at microphone level. Additionally, the FMX-42u and FMX-42a can also output line level. The FMX-DSLR outputs only a 3.5mm stereo mini-jack for DSLR cameras. It is also compact and designed to mount underneath a DSLR camera. Lastly, the FMX-42u is the only Azden mixer with a digital USB output which you can use to record audio to a mobile device or a computer.

      Next, consider how many microphones you may need to record with at one time. The FMX-42u and FMX-42a offer 4 input channels, while the FMX-32a offers 3 and the FMX-22 and FMX-DSLR offer 2. And what kinds of microphones are you using? The FMX-42a, 42, 32a and 22 all take XLR inputs while the FMX-DSLR also accepts a 3.5mm mini jack microphone input.

      Another feature set to consider may be whether you need camera returns on your mixer to monitor audio directly from your camera. The FMX-42a and FMX-DSLR offer this feature.

      If all of this sounds like overkill to you, the CAM-3 mixer may be what you’re looking for. It takes only 3.5mm mini-jack inputs and could allow you to mix together 3 different microphone sources (2 mono, 1 stereo), like a WLX-PRO with an EX-413 and an SMX-10, for example. The CAM-3 outputs to a 3.5mm stereo mini-jack.

    • What’s the difference between the FMX-42u and FMX-42a?

      The FMX-42a provides a 10-pin camera return and a mini-jack camera return for monitoring audio from the camera. The FMX-42u lacks any return monitoring capability but has a stereo digital audio USB output for recording to mobile devices and computers. Aside from these unique features, the FMX-42a and FMX-42u are identical.

    • My Azden mixer is not working properly. Can you repair it?

      Yes we can. See the Service And Warranty page for details. We recommend you give a call first to see if we can troubleshoot your problem over the phone.

    • I lost my mixer’s power supply A/C adapter. Where can I buy a new one?

      The FMX-42a and 42 mixers use the BC-27H power supply and the FMX-32a and FMX-22 use the BC-27. You can find these items and more for sale on our website www.azdenproshop.com.

    • Can I make my Azden mixer work with a smartphone or tablet?

      We created the FMX-42u specifically for this purpose. It has a digital audio output via USB which can be connected to smartphones, tablets and computers. The required "USB mini-B male to USB A male" cable is not included and will need to be purchased separately. Special note: For recording to an iOS device, you'll need to purchase an Apple® Lightning™ to USB Camera Adapter cable in addition to a USB cable.


      For other mixers, technically you can use an HX-Mi TRRS Mic/Headphone Cable to record to a mobile device with an Azden mixer. However, it is important to note that you will not be able to mix in stereo using this cable into a smartphone or tablet. For best results, on the FMX-42a/42u pan your mixer’s channels hard left. For the FMX-32a/22 make sure your channel’s pan switch is set to L (left). On the FMX-DSLR, you will be limited to using the MIC 1 input.


    • Can I use rechargeable batteries with my Azden mixer?

      We recommend using standard alkaline batteries. We do not recommend using rechargeable batteries with any of our VHF and UHF wireless units, mixers or microphones. In general, rechargeables will not last as long as standard alkaline batteries.