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INPUT PANEL
1. XLR INPUT

 for balanced, 

low-impedance, +4dB line-level 

signals. 

2. Ground lift 

disconnects the 

signal ground to eliminate buzz 

and hum caused by ground loops. 

3. Secondary Ground Lift

 used 

for instances where two separate 

devices are connected to the 

outputs.

OUTPUT PANEL
4. Output Level 

provides signal 

attenuation to prevent clipping.

5. 3.5mm TRS 

output connection 

for stereo -10dB devices such as 

portable recording units.

6. RCA Phono 

left and right stereo 

outputs for -10dB consumer audio 

electronics.

7. ¼" TS 

left and right stereo 

outputs for high-impedance audio 

electronics.
 

CONSTRUCTION
8.

 

Bookend design

 14 gauge steel 

outer shell creates protective zone 

around connectors and switches.

9.

 

I-beam enclosure

 eliminates 

stress that could torque the PC 

board and cause solder joint failure.

10. PCB mounted

 switches are 

high-cycle rated for long life. 

11.

 

Jensen 

(J•ISO) and 

Radial 

(Pro-ISO) transformers offer 

outstanding audio performance.

12.

 

Military-grade

 double-sided 

PCB with plated through-holes is 

bolted to welded steel standoffs.

13. Full-bottom no-slip pad

 This 

provides electrical isolation and 

plenty of "stay-put" friction.

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J•ISO / Pro-ISO User Guide

Radial Engineering Ltd.

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