J33 Features & Specs
 
                       Inside the J33

The J33 Phono DI follows the Radial tradition of combining stellar audio performance with a flexible feature set and rugged enclosure. Look inside a J33 and you will find the build quality and components to be of only the highest professional standards. Radial's proven construction methods and materials ensure years of trouble-free service.
Inside the J33
 1. 14-gauge steel welded I-beam construction makes it virtually impossible to torque the PC board.
 2. Isolated XLR connectors to eliminate chassis ground potential.
 3. Mil spec PC board with full surface ground plane to reduce susceptibility to RF noise.
 4. High grade switches - long life, high cycle for reliable performance.
 5. Gold-plated RCA and high grade 1/4" and 1/8" connectors offer a variety of input options.


Input panel


Output Panel

J33 Input and Output Panels
 6. GROUND - Turntable ground lug to reduce noise and buzz. Knurled knob provides an easy-to-use and reliable solid bond.
 7. Filter - low frequency rumble filter to reduce resonant feedback at high sound pressure levels. Works from 100Hz and rolls off to -15dB at 80Hz.
 8. POWER - LEDS light individually when J33 is deriving power from XLR phantom-power or both at once when powered from external power supply.
 9. 1/4" TRS and 3.5mm stereo output connectors:-10dB high-impedance line-level for hookup to computer sound cards and laptops.
10. OUTPUT left & right RCA connectors: -10dB high-impedance for consumer audio devices such as hi-fi receiver AUX or CD input.
11. PHONO input from turntable - RIAA equalized. Use in conjunction with turnable ground lug connection.
12. Bookend design creates a protected zone around connectors and makes the J33 practical for high-use environments such as pro touring.
13. No-slip rubberized pad provides mechanical and electrical isolation, keeps the J33 from sliding around.
14. RIGHT OUT & LEFT OUT 600-Ohm mic-level balanced XLR outputs- AES standard with Pin-1 ground and Pin-2 hot.
15. 15VDC Input jack for use with the J33's external power supply. Phantom-powering is also available through mic XLR.

Construction

The J33 is designed to withstand the rigors of high-use professional environments! Radial's innovative 'book end' design provides a protective zone around the switches and connectors that keeps these components safe.

Stress on circuitboards causes broken and intermittent solder joints, a common cause of failure in commercial rental and other high-use environments. Radial's 14-gauge welded I-beam inner chassis and 14-gauge outer shell greatly reduce the possibility of torque stresses being applied to the PC board.

A full-bottom no-slip rubber pad works double duty by (a) providing protection from electrical shock and (b) assuring that the J33 won’t slip and slide around.



J33 Specifications
Frequency response:
20Hz to 20kHz
Total harmonic distortion:
0.05% @ 1kHz
Phase shift:
0.1º @ 1kHz
Intermodulation distortion:
< 1%
RIAA dynamic phono input:
-25dB
Max phono input level: 50mV @ 1kHz
High pass filter: 200Hz cut off, -3dB at 100Hz
Unbalanced outputs:
10kOhm, -10dB line-level
Balanced outputs: 600 Ohm, -60dB mic-level
Output levels: -10dB consumer line-level
-60dB 600 ohm mic-level
RIAA curve:
(reference dB @ 1kHz)
+19.5dB @ 20Hz
-19.65dB @20kHz
RIAA deviation +/-0.5dB maximum
Size (H x W x D):
2” x 3.25” x 5” (45mm x 83mm x 126mm)
Power (auto-switching) 15VDC or 48V phantom power
Weight (w/supply and packaging):
1.95lbs (0.9kg)
Construction:
14-gauge steel chassis & shell, baked enamel finish
Warranty:
Radial 3 year limited warranty
(see user guide for details)
 
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