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5.3.1.1.4 Digital in Source
Hilo offers a choice of AES or S/PDIF as the digital
input source. With S/PDIF you have the option of
Coax or Optical Inputs.
Before being pushed, this button shows the current
selection. Upon pushing the button, you can select:
AES; SPDIF Coax; or SPDIF Opt. If selecting
SPDIF Optical, the Optical Out mode must be set to
SPDIF from Settings: Audio.
Note: You do not need to make this choice for outputs,
as all three digital outputs are independently available
and assignable.
5.3.1.1.5 Line in trim
Line in trim can be set to any of eight preset trim settings. The Line in trim button shows the currently selected trim level, it is the
same for the Left and Right inputs.
There are four Pro Level settings: +18 dBu; +20 dBu; +22 dBu; and +24 dBu. There are four additional levels most often used on
Consumer Audio products: +0 dBV; +2 dBV; +4 dBV and +6 dBV.
When the button is pushed, a Selection Window pops up. Pushing the desired Level button resets the inputs and immediately indicates
this on the Line in trim Button. You will typically hear a relay click from inside Hilo when a selection is made. It is ideal to set the
Line in trim to match the Trim value of whatever audio device is connected to the Line Inputs. This insures optimum signal strength,
without clipping the inputs. Check your input device’s documentation for information.
Note: These are 0dBFS (full-scale) level settings, as opposed to nominal levels.
Trim pots are available to fine tune these inputs. See Appendix 9.3 XLR Connector Wiring
andAdapters
This section describes the proper wiring of cables that can be used to adapt the analog audio XLR connectors on the
Hilo.
5.3.2
Balanced Connections
The wiring method for balanced connections with XLR connectors to balanced TRS (¼” phone) connectors using
shielded twisted pair cable (2 wire + shield) is as follows:
XLR Pin 1 (GND) to cable shield and to the TRS sleeve
XLR Pin 2 (+) to one signal wire and to the TRS tip
XLR Pin 3 (-) to the other signal wire and to the TRS ring
1
2
3
XLR Male
or Female
2 Conductor shielded cable
TipSleeve
Ring
1/4" Phone Plug
(Balanced)
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