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DT454 DSLR Audio Solution

$419.00

4 Mic Control (2 XLR + 3.5mm Stereo) + Phantom Power + Meter + Headphone + AGC Disabler ///

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The DT454 is no longer in production.  Please see the Riggy-Assist RA333 as its replacement.

  • 4 mic channels (2 XLR, 2 unbalanced)
  • Low-noise preamplifiers
  • Meters
    • 4 segment LED (each right/left)
    • 2 sensitvity settings; adjustable
    • Meters valuable with the new 5DMKII firmware, which does not show meters during recording
  • AGC Disable (to get better SNR from cameras without manual control)
  • 30dB low-noise typ max gain (single ended, stereo)
  • Headphone Amplifier
  • Playback Monitoring
  • 48V Phantom, plus 12V power saving mode
  • Made in USA
  • DT414/DT454 User Manual

This video demonstrates the DT454 AGC Disable feature using 2 cameras which do not have manual control (7D and T2i). Note, signal-to-noise performance will be even better using the DT454 with a camera that has manual control (and does not require AGC Disable), such as the 5D.

This video shows the meter calibration procedure for use with the 5D. Please follow along with the User Manual for more precise instructions.

This video shows the meter calibration procedure for use with a 7D or T2i. Please follow along with the User Manual for more precise directions. Other cameras without manual control have a similar calibration procedure (while using different settings).

 
 
 
Signal-to-Noise Expectations with Various Mics and Cameras
 
You can not remove noise from electronic equipment. The name of the game is to optimize the signal-to-noise performance. This becomes more important when recording things like dialogue in quiet rooms. There are many elements in the signal chain which impact this (noise in the camera, noise in the microphone, how close the microphone is placed to the source). Low-noise preamps can improve the signal-to-noise performance of noisy downstream elements such as a camera. This is accomplished by throttling back the noisy camera amps, and replacing the noisy gain with clean gain from a juicedLink low-noise preamp. The amount of improvement will depend on how noisy the camera amps were in the first place. However, a preamp can not fix poor signal-to-noise upstream that gets plugged into its input. So, low-noise preamps can not fix microphones with poor signal-to-noise, or the effects of poor microphone placement.
 
In practice, what does this all mean?
 
Run-n-gun microphones with unbalanced outputs (stereo minijack) will typically not have as good of noise performance as reasonable quality balanced XLR microphones. Plus, they are used on-camera which is further from the speaker (resulting in much less signal getting into the mic ... important in signal-to-noise), compared to booming the mic and getting it really close to the speaker. Since the signal level going into an on-camera mic will be lower, so will its signal-to-noise ratio that will be presented to the equipment downstream. This will set the signal-to-noise of the system, masking any improvement in signal-to-noise that the preamp can get from the camera.
 
To realize the benefits of the DT454 in improving the downstream signal-to-noise of the camera, you must use a microphone with decent SNR specs(>76dB SNR) and booming it to get it close to the source (< 1.5ft from source), so the noise from the microphone will not mask the good signal-to-noise performance achieved by the DT454. These will typically be XLR mics.
 
You can learn more about the principles quality audio from our Tutorial Videos on Audio.
 

 


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  • Model: JL-DT454
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