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Radial (R800 1300) Direct Box (R800 1300) (Black)


What's in the box:

  • Radial Engineering J33- Turntable Preamp and Direct Box
  • External Power Supply
  • Three (3) Year Warranty


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Item Number 
Vendor Part
R800 1300

The Radial Engineering J33 is a combination phono preamplifier and purpose built stereo direct box made to handle the rigors of the professional recording studio and the abusive environment of live touring. Designed specifically for dynamic cartridges, the J33 begins with a low noise front end. Inputs are standard RCA with the required turntable ground lug. A second set of direct box XLR outputs deliver a mic level signal to feed a concert snake, mic splitter and mixing desk preamp inputs. A rumble filter is also available for high sound pressure environments to reduce bothersome resonant feedback. As with all Radial DIs, the J33 features a 14 gauge steel enclosure with a unique book-end design that creates a protective zone around the switches and connectors.


  • Combination RIAA Phono preamp and DI box
  • Stereo RCA, ¼" TRS, 3.5mm and XLR outputs
  • Built -in low frequency rumble filter
  • Choice of 48V phantom or DC supply

Specifications for the Radial (R800 1300) Direct Box

{ "Audio circuit type:" : "Active circuit", "Number of channels:" : "Stereo", "Frequency response:" : "RIAA response curve for phonographic playback", "Dynamic range:" : "91dB", "Total harmonic distortion:" : "0.002% @ 1kHz (-33dBu input level)", "Intermodulation Distortion:" : "0.025% @ -45dBu input", "Input Impedance:" : "47k Ohms, unbalanced", "Output Impedance:" : "XLR out: 600 Ohms; ¼", 3.5mm, RCA outs: 470 Ohms", "Equivalent Input Noise:" : "-82dBu @ 0dBu output", "Maximum Input:" : "-30dBu @ 1kHz", "Voltage Gain:" : "+37.8dB", "Features" : { "HPF" : "", "Input Connectors:" : "RCA", "Output Connectors:" : "RCA, 1/4", 3.5mm, XLR", "Extras:" : "Rumble Filter" }, "General" : { "Construction:" : "14-gauge steel chassis and outer shell", "Size (L x W x D):" : "5" x 6.25" x 2" (127 x 159 x 51mm)", "Weight:" : "2.80lbs (1.28 kg)", "Power:" : "+48V phantom or +15VDC/400mA external supply (included)", "Conditions:" : "For use in dry locations only between 5°C and 40°C" } }