Radial Engineering LX8, User Manual

True to the Music

Radial Engineering Ltd.

LX8

™

 User Guide

SIGNAL FLOW

Take a moment to follow the signal path through the block diagram below.

Inputs 1-8 

DB-25

Front Panel

XLR x 8

Inputs 1-8 

Euroblock

Direct Output and

Return Path for 48V

Auxiliary Output with 

Ground Lift

Transformer

Isolated Output

Front Panel

Ground Lift

DB-25

Euro

Block

Front Panel

Ground Lift

DB-25

DB-25

Euro

Block

Euro

Block

Isolation

Transformer

1

2

3

4

2

Parallel Inputs

For flexibility, the LX8 has three paralleled inputs.

• Female XLR connectors on the front panel 

• 25 pin D-SUB (DB-25) on the rear panel

• Euroblocks screw terminals on the rear panel (Set of eight 

Euroblocks terminals sold separately, Order # R800 8050). 

Direct Output

The DIRECT output is the primary “straight through” output. It 

is paralleled to DB-25 and Euroblocks terminals for flexibility.

Auxiliary Direct Output with Ground Lift

The AUXILLARy outputs uses eight front panel switches to 

lift the ground. This output may be patched to another audio 

system that may or may not be transformer isolated itself. The 

DIRECT WITH GROUND LIFT output is paralleled to DB-25 

and Euroblocks terminals.

Isolated Output

The  ISOLATED  outputs  uses  eight  precision  Jensen  audio 

isolation  transformers  to  decouple  the  signals  from  the  DI-

RECT  outputs.  This  output  may  be  patched  to  a  separate 

audio system without creating ground loops. The ISOLATED 

output is paralleled to DB-25 and Euroblocks terminals.

Transformer

After  the  PAD  the  signal  is  fed  to  the  isolation  transformer 

where  the  mic  signal  is  decoupled  to  eliminate  noise  from 

ground loops. For the most flexibility when designing technical 

ground systems, each transformer features an internal switch 

allowing the signal ground to connect around the transformer. 

RF Filter 

(not shown in the diagram)

The three paralleled inputs employ a RF network filter on their 

ground paths to prevent unused inputs from acting like anten-

nas when the ground is lifted. Any radio frequencies picked up 

by an open pin will be shunted to ground. 

1

2

3

4