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Orban 5750 Technical Manual
good engineering practice to ensure all mission critical equipment is protected. The 5750 input voltage is 100-240
VAC 50-60Hz, making the unit universal electrically.
Once the 5750 has booted, it's now time to apply audio to the processor. This portion of the manual will discuss the
various input features available to you and your 5750.
Cable
Orban recommends using two-conductor foil-shielded cable (such as Belden 8451 or equivalent) for the audio input
and output connections because signal current flows through the two conductors only. The shield does not carry
signal and is used only for shielding.
Analog Audio Input
Nominal input level between –14dBu and +8dBu will result in normal operation of the 5750. Analog inputs require
an XLR type MALE connector.
•
(0dBu = 0.775Vrms. For this application, the dBm @600 scale on voltmeters can be read as if it were calibrated
in dBu.)
•
The peak input level that causes overload is +27.0dBu.
•
The electronically balanced input uses an ultra-low noise and distortion differential amplifier for best common
mode rejection and is compatible with most professional and semi-professional audio equipment, balanced or
unbalanced, having a source impedance of 600 or less. The input is EMI suppressed.
•
Input connections are the same whether the driving source is balanced or unbalanced.
•
Connect the red (or white) wire to the pin on the XLR-type connector (#2 or #3) that is considered HIGH by the
standards of your organization. Connect the black wire to the pin on the XLR-type connector (#3 or #2) that is
considered LOW by the standards of your organization.
•
In low RF fields (like a studio site not co-located with an RF transmitter), connect the cable shield at 6300 input
only—it should not be connected at the source end. In high RF fields (like a transmitter site), also connect the
shield to pin 1 of the male XLR-type connector at the 5750 input.
•
If the output of the driving unit is unbalanced and does not have separate CHASSIS GROUND and (–) (or LOW)
output terminals, connect both the shield and the black wire to the common (–) or ground terminal of the driving
unit.
2-9
Installation
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