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Beachtek DXA-ALEXA Low-Noise Preamplifier for ARRI ALEXA Mini Camera

BH #BEDXAALEXA • MFR #DXA-ALEXA
Beachtek
Beachtek DXA-ALEXA Low-Noise Preamplifier for ARRI ALEXA Mini Camera
Key Features
  • For ALEXA Mini & Compatible Cameras
  • Low-Noise Preamp, 100 dB Dynamic Range
  • Allows for Recording Directly to Camera
  • 2 x Transformer-Balanced XLR Inputs
Designed primarily for the ALEXA Mini, but compatible with cameras such as the RED DSMC2, the Beachtek DXA-ALEXA is a low-noise preamplifier which connects directly to your camera, capturing audio through its transformer-balanced inputs and obviates the need for external syncing. The preamp itself sports a 100 dB dynamic range, and the construction of its inputs ensure galvanic isolation, as well as high common mode rejection in the face of common obstacles, such as electromagnetic interference.
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Beachtek DXA-ALEXA Overview

Designed primarily for the ALEXA Mini, but compatible with cameras such as the RED DSMC2, the Beachtek DXA-ALEXA is a low-noise preamplifier which connects directly to your camera, capturing audio through its transformer-balanced inputs and obviates the need for external syncing. The preamp itself sports a 100 dB dynamic range, and the construction of its inputs ensure galvanic isolation, as well as high common mode rejection in the face of common obstacles, such as electromagnetic interference.

The DXA-ALEXA provides dual gain controls which are detented for precise settings, as well as high/low switches for microphone matching, switchable 48V phantom power for condenser mics, and easy-to-read LED level indicators which give you a good picture of your overall sound; green signifies a level between -40 and +16 dBu, yellow takes you all the way to +4, and red gives you an indication of overs.

A carbon fiber chassis is relatively lightweight at under a pound, while weather-resistant top-panel switches ensure reliability in wide variety of conditions. For outputs, the DXA-ALEXA gives you a balanced 5-pin XLR output that can connect directly to 5-pin LEMO inputs. You can also route signal to other recorders by means of an unbalanced 3.5mm jack. Connections are provided for headphone and loopback monitoring as well. The preamp itself draws power from your existing rig by means of a 2-pin LEMO connection. Thanks to the preamp’s three threaded 1/4"-20 holes, you can mount this unit on the rails of third-party brackets, though a bracket has been included for mounting to camera cages, such as the ARRI ALEXA Mini camera cage. 

Key Performance Features

  • Records audio directly to camera, obviating the need for syncing
  • 100 dB dynamic range, low-noise operation
  • Headphone monitoring and loopback monitor for external devices
  • Green, yellow, and red level indicators built-in for quick, overall level monitoring
  • 48V phantom power offered on both inputs
  • Transformer-balanced inputs provide galvanic isolation and high common mode rejection
  • Dual mono recording or stereo recording
  • Audio bracketing feature for backup
  • 5-pin XLR 4 dBu line-level output matched to line-level input of camera
  • High and Low switches for gain to match microphones
  • Auxiliary unbalanced microphone output for attaching an audio recorder (suitable for MP3 transcription or backup)

Key Physical Features

  • Rugged chassis, easy operation
  • Locking Neutrik XLR connectors
  • Water-resistant top-panel switches
  • Detented level controls for precise adjustments and recall
  • Power switch provided on operator side, other controls situated on top and assistant side when situated in rear-rod mount position
  • Multiple mounting options, with mounting bracket included

Beachtek DXA-ALEXA Specs

ConnectorsPhones: 3.5 mm stereo headphone connector
RTN: 3.5 mm stereo input for loopback from camera
Mic In Channel 1: XLR balanced mic-level input for channel 1
Mic In Channel 2: XLR balanced mic-level input for channel 2
Line Out: 5-pin balanced output at +4 dBu
Mic Out: 3.5 mm unbalanced auxiliary stereo output
2-pin LEMO 12 to 16 VDC power
Frequency Response20 Hz to 20 kHz (±1 dB)
GainLine Out:
Low: 40 dB, High: 60 dB

Mic Out:
Low: 10 dB, High: 30 dB
Maximum Input LevelLow Gain: -15 dBu
High Gain: -35 dBu
Output Clipping LevelLine Output: +25 dBu
Mic Output: -5 dBu
Dynamic Range100 dB
THD+NLow Gain: 0.012% (+4 dBu output, 1 kHz)
High Gain: 0.06% (+4 dBu output, 1 kHz)
Channel SeparationLow Gain: 85 dB (+4 dBu output, 1 kHz)
High Gain: 80 dB (+4 dBu output, 1 kHz)
MeteringTri-Color LED:
Green: -40 to 16 dBu
Yellow: -16 to +4 dBu
Red: Over +4 dBu
PoweringExternal DC input jack (12 to 16 V)
Pin 1 = (-), Pin 2 = (+)
Dimensions5.0 x 3.8 x 1.6" / 126 x 96 x 40 mm
Weight0.8 lb / 374 g
Packaging Info
Package Weight2.07 lb
Box Dimensions (LxWxH)9.9 x 7.9 x 3.8"

Beachtek DXA-ALEXA Reviews

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YOUR RECENTLY VIEWED ITEMS

question

This Beachtek unit has such a better layout than most of Beachteks other models, not to mention its very aesthetically pleasing. Its a little disappointing that they specify this unit as being engineered for one or two cameras in particular. Would this also be usable with a DSLR like the Canon 5Dmk3 or a small video camera like the Canon XC-10? Or are the higher quality components advantages only realized with the Alexa or a RED unit? Thanks in advance
Asked by: Anonymous
It was designed withe ALEXA in mind: Line Out: 5-pin balanced output at +4 dBu.But there is no reason it could not be used with other cameras: Mic Out: 3.5 mm unbalanced auxiliary stereo output
Answered by: Mark S.
Date published: 2018-08-27

question

Can it only mount on rods or does it have 1/4-20 screw mount?
Asked by: Nick
The Beachtek DXA-ALEXA has three threaded 1/4/20 holes in the base of the unit.
Answered by: Dana G.
Date published: 2018-08-27

question

We could use this on the Amira 5-pin input as well, right?
Asked by: Nick
The balanced 5-pin output will have the same pin configuration for everything in that line.
Answered by: Andrea O.
Date published: 2018-08-27

question

Can you turn the volume down to negative infinity (zero) output to the camera?
Asked by: Nick
The mic preamps on the DXA-Alexa when turned down fully passes no audio signal.
Answered by: Jeff P.
Date published: 2018-08-27

Will this work with older Alexa models? Such as ...

Will this work with older Alexa models? Such as the Alexa Plus and Alexa Plus 4:3?
Asked by: Michael
Yes, the DXA-ALEXA has a 5-pin XLR balanced audio out for connection to the camera's input as well as a 3.5mm stereo return for loopback from the camera, as well as a 3.5mm stereo out for headphones to monitor the audio.
Answered by: Lisa
Date published: 2020-11-05
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