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



  • 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
  • 2 year warranty

Out of stock

Out of stock


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 white 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.

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:220 mm W x 160 mm D x 56 mm H (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)
LevelLINEStandard: +4 dBu (electronically balanced)
  Maximum: > +26 dBu
  Impedance: 20kΩ
 MIC HIStandard: -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)
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):  USB mini-B connector (female)
Balanced Level Output   
+4 dBuLINEStandard:+4 dBu (electronically balanced, 5kΩ load)
  Maximum: +20 dBu (electronically balanced, 5kΩ load)
-36 dBuMICStandard:-36 dBu (electronically balanced, 5kΩ load)
  Maximum:-20 dBu (electronically balanced, 5kΩ load)
  Impedance:600 Ω
  Standard:-36 dBu (electronically balanced, 2kΩ load)
  Maximum:-20 dBu (electronically balanced, 2kΩ load)
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: Isocronas Data Format 
Sampling Frequencies: 16 / 22.05 / 32 / 44.1 / 48 kHz Compatible 
Bit Depth: 8 / 16 bit Compatible 
Channels: 2 

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