PROFESSIONAL SOUND CORP.
PRESS BRIDGEOPERATION MANUALCOPYRIGHT 2008

OVERVIEWThe Professional Sound Corporation® Press Bridge has been
designed to allow audio distribution at press conferences. This 3 input,
12 output device provides transformer-isolated audio feeds at
microphone level. This Press Bridge features two microphone leveland one line level input, each with independent level controls, thus it
may operate without the use of any additional audio mixer.
An important distinguishing feature of this press bridge is the ability
to add additional "satellite style" output modules each with 12additional outputs, all the way up to a total of 120 outputs. These
freestanding output modules are available as the PSC "Press Train".
Up to 10 Press Train modules may be remotely located from the main
unit via standard microphone cables up to 500' in length thus
eliminating multiple long cable runs to each member of the media.
The Professional Sound Corporation® Press Bridge is housed in aheavy-duty aluminum case and finished in black powder coat fordurability. It can be powered for more than 12 hours from two 9 volt
batteries, or from a 9 to 18Vdc adapter. A Sifamtm V.U. meter and a
Internal tone oscillator are provided for level setting purposes.

OPERATION
1.

Confirm that the PSC Press Bridge has new batteries. Only use
alkaline cells. If the batteries are in good condition, the front
panel green LED will light when the Press Bridge is turned on. If
the batteries are below usable range, the LED will turn red,
indicating the need to install fresh batteries. An external AC
adapter is optional and not included with the unit.

2.

You may wish to supply a reference tone to the various cameracrews prior to the press conference starting. This will allow thecamera crews to pre-set the levels to match the output levels ofthe PSC Press Bridge. When using the Reference oscillator, you
should turn off all three audio inputs so that the PSC Press Bridge
will output a pure tone for reference purposes. Prior to the startof the press conference, turn off the reference oscillator andresume mixing of the three audio inputs.

3.

The PSC Press Bridge contains two microphone inputs and oneline level input. The two microphone inputs are designed tooperate with Dynamic microphones only, such as the ElectroVoice RE-50 or the Shure SM 57/58. Any combination of one ortwo microphones and one line level signal may be used at anytime. The PSC Press Bridge contains a simple mixer function
allowing you to mix any desired signals.

4.

Operate the input level controls so that the V.U. meter respondswith peaks approaching “0” dB.

5.

The PSC Press Bridge contains 12-balanced outputs atmicrophone level. Each of these outputs is transformer balanced
and isolated (floating) from ground. This assures that eachoutput can be used to feed various camera crews without theworry of ground loops, etc. Notify the camera operators to set
their inputs to Microphone level and to turn off all microphone
powering (set the inputs to “Dynamic”)

6.

If you have a need for additional outputs beyond the 12 of thePress Bridge, you can add on the PSC Press Train for an additional
12-outputs. You can add up to 10-Press Trains for a total of 120
outputs. On the right side of the PSC Press Bridge are two XLR
male connectors that output the mixed audio at line levels. Theseoutputs are used to connect to the PSC Press Trains.