Azden FMX-42u 4-Channel Microphone Field Mixer with USB Digital Audio Output

Model #FMX-42U

Azden Warranty
Azden fmx 42u 1
Azden fmx 42u 1
Azden fmx 42u 2
Azden fmx 42u 3
How it works
  • You name the price you want to pay for a product.
  • We send your offer to a network of Certified Retailers.
  • If the retailer likes your offer, you get that price for the product.
Greentoe Guarantee
  • All Products are New and from Manufacturer Authorized Retailers
  • 30 day return policy
  • Free Shipping
    No Additional Fees

Product Back-Ordered

We are sorry. At this time, we are not accepting offers on this product. Please click the button below to be notified when our retailers get it back in stock.

Thank you! We will be in touch. Something went wrong. Please try again later.

Packaging Info

Package Weight 3.85 lb
Box Dimensions (LxWxH) 10.4 x 6.7 x 3.7"


Digital Output Connector: USB mini-B (female) 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
Balanced Output XLR 3-pin male x 2 (output L & R)
Unbalanced Outputs 1/8" (3.5 mm ) stereo mini-jack
Monitor Output 1/4" (6.3 mm) stereo jack
Balanced Output Level LINE- Standard: +4 dBu (electronically balanced, 5 kOhms load) Maximum: +20 dBu (electronically balanced, 5 kOhms load) Impedance: 600 ohms MIC- Standard: -36 dBu (electronically balanced, 5 kOhms load) Maximum: -20 dBu (electronically balanced, 5 kOhms load) Impedance: 600 ohms
Unbalanced Output Level Standard: -36 dBu (electronically balanced, 2 kOhms load) Maximum: -20 dBu (electronically balanced, 2 kOhms load) Impedance: 120 ohms
Monitor Output Max Output: +1 dBu (32 ohm load at 9 V), 16 - 100 ohms load recommended
Meters Standard Output Level: 0 VU (+4 dBu)


Impedance 11 kOhms
Return Input No
Balanced Input XLR 3-pin female x 4 (CH1, 2, 3 & 4)
High Pass Filter 100 Hz - 6 dB/oct
Level Line- Standard: +4 dBu (electronically balanced) Maximum: > +26 dBu Impedance: 20 kOhms MIC HI- Standard: -38 dBu (electronically balanced) Maximum: +4 dBu Impedance: 2 kOhms MIC LO- Standard: -58 dBu (electronically balanced) Maximum: -15 dBu Impedance: 2 kOhms
Input Level -20 to +19 dBu (unbalanced)


Battery Requirement 6x Alkaline AA
Current Drain Not Specified By Manufacturer
External Power 10.5 ~ 17 VDC @ 200 mA
Weight 2.9 lb (1.3 kg), without batteries
Dimensions 9.0 x 6.5 x 2.3" (220 x 160 x 56.0 mm), without protrusions
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 Ratio Balanced Output: -120 dBu (A weighted, input equivalent level)
THD Balanced Output:
Phantom Power 48 V (±1.5 V)
Sample Frequency 1 kHz
User Reviews
B h photo.34921152
26 July 2012

I used this mixer for the better part of a season on an ocean focused natural history show. Complete run and gun. Its packed with features. No rust from salt water spray (yet). It's been banged up from a lot of travel (always in a checked in pelican) and didn't miss a beat.

B h photo.34921152
29 April 2015

Great for when I don't have an audio guy, or for my PA to run audio. The Meters are a bit finicky, but you can calibrate them and they are more than passable. Best if you can also see the camera's meters while operating for a little extra confidence if you want to ride the levels on the higher side.

B h photo.34921152
19 January 2014

I used this on a 30 day shoot where the production had their own equipment. Was connected to a zoom H4 for recording. the controls are great the master volume is amazing to use and makes things handy, the pan is easy and flexible.

B h photo.34921152
17 November 2011

I use this mixer for location/eng sound for video production. The mixer is built solid and has all the functions needed for location sound. I like the VU meters and the limiters work well.For the low price...well worth it.

B h photo.34921152
5 March 2012

I use it for mixing during deposition recordings. It is quick to set up. Easy to manage the levels. Built in 1khz tone. The slate mic means I don't have to set up another mic just for announcements.

B h photo.34921152
13 May 2015

As an old field soundo sneaking back into the game, I was on the lookout for a field mixer that reminded me of the old Sony MXP42 I used to run. Without the first up cost! Found it. I think a lot of people would say the standard thing of, too cheap, Rubbish, and such, but for the price?

B h photo.34921152
23 December 2013

Got it on Tuesday used it for a 4 camera shoot on Wednesday. Very impressed with the sound quality.

B h photo.34921152
28 November 2011

This little mixer has a great set of features and is a lot of mixer for the money. The individual control over phantom power on each channel, as well as the individual gain adjustments on each input are extremely useful.

B h photo.34921152
19 November 2011

Great mixer and made in Japan. Very reliable and pro sound. You won't regret buying it.

B h photo.34921152
1 June 2011

I use this for doing production sound and for the price point, this unit works well and is quite quiet. I run this unit into a Sound Devices 702 and get consistently good results. It's easy to use and pretty rugged. I'm using it until I upgrade to an Sound Devices 788 or Zaxcom Deva.

Product Highlights
  • 4 XLR Inputs
  • Phantom Power
  • Input Limiter
  • 2 Balanced Mic/Line XLR Outputs
  • Make Backup Recordings Using USB Output
  • Record to Smartphone, Tablet or Computer
In The Box
  • Azden FMX-42u 4-Channel Microphone Field Mixer with USB Digital Audio Output
  • Nylon Carrying Case
  • Limited 2-Year Warranty
Still Have Questions?
We can help via Live Chat, Email or you can call us 1-888-840-0464


Please log in or sign up to continue


Validating Credit Card...

It will not be processed until the offer is accepted by a merchant.

Notifying Retailers...

Notifying our merchants and checking to see if they accept this offer.

Offer Submitted!

3-digit code in the back of your credit card