User guide

Radial Engineering Ltd.

PreComp™ Preamp and VCA Compressor

True to the Music

MAKING CONNECTIONS

Although the PreComp is easy to use, we suggest you follow these simple instructions before

getting started. As with all audio equipment, always ensure levels are turned down and

equipment is turned off before making any connections or inserting the PreComp into a 500

series power rack. This common practice ensures turn-on transients will not damage more

sensitive components such as tweeters.

Before inserting the PreComp into your 500 series

power rack observe the setting of the mini-toggle

switch located next to the 15-pin card-edge. This

switch turns the Omniport™ function on and off.

During initial set up use the ‘NORMAL’ setting. This

will turn the Omniport function off and simplify setup

and testing.

After inserting the PreComp into your 500 series rack, secure it using the supplied machine

screws to ensure it does not accidentally become dislodged during use. To prevent damage to

the power rack, do not over-tighten the mounting screws.

Most 500 series racks are equipped with balanced XLR connectors. When you insert the

PreComp into your 500 series rack it will automatically route the rear panel XLR connections to

the module’s input and output. This is augmented with ¼” TRS connectors if using the PreComp

in a Radial Workhorse 500 series power rack. The PreComp follows the AES standard with pin-

2 (+) hot, pin-3 (-) cold. Most devices are wired this way but older vintage equipment should be

checked to conﬁ rm compatibility with AES standards.

Connect a microphone or direct box to the input of the PreComp input using a standard XLR

patch cable. If you are using a condenser microphone or active direct box, turn on the 48V

phantom power. The switch is recessed to prevent accidental turn on. Use a small screw driver

or paper clip to push in the switch. A red LED will illuminate when phantom power is active.

INPUT

OMNIPORT

FEED

LINK

OFF

CARD SLOT 1

OUTPUT

INPUT

REAR PANEL MIC INPUT AND LINE OUTPUT

Connect the line-level output of the PreComp to your audio system so that you can audition

the PreComp. We recommend that you ﬁ rst listen to the PreComp on its own before combining

with effects or other signal processors until you have had a chance to familiarize yourself with

the preamp and compressor functions. Using your own voice to test is best as it gives you a

familiar starting place.

NORMAL

OMNIPORT OFF

INSERT

OMNIPORT ON