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If the selected Preferred Clock Source is not also displayed as the Current Source at the top of the Adapter page, it would be for one of
the following reasons:
1. The selected source is not present or the connected device is not generating a valid clock signal. In these cases, Hilo will operate
from its internal clock until a valid clock signal is connected to the selected clock source.
2. The selected clock source is generating a sample rate outside of the Hilo’s usable range (i.e. 22 kHz). This can be corrected by
setting the clock source to a supported sample rate (44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz).
3. The Clock Source was selected when the Hilo Drivers were being accessed by some software application. In this case, the Preferred
Clock Source will become the Current Source when the card is no longer being accessed.
Analog Reference Level
This section is where the Trim levels can be set for the Hilo’s Line Inputs and Line Outputs. Trims can be set to any of eight preset
trim settings, and they are the same for the Left and Right channels.
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.
Note: These are 0dBFS (full-scale) level settings, as opposed to nominal levels.
When the trim button is clicked, a menu displays the choices. You will typically hear a relay click from inside Hilo when a selection is
made.
Trim pots are available to fine tune these inputs. See Section 9.3: Setting Trim Pots for more information.
Digital I/O Settings
This section is were settings specific to the Hilo’s Digital I/O can be configured.
Optical Out Mode: This drop down can select operation of the Hilo’s Optical Digital Output, The default is stereo SPDIF, but can be
toggled to 8-channel ADAT light pipe mode.
Digital in source: Hilo offers a choice of AES or S/PDIF as the digital input source, with AES being the default. With S/PDIF, there
is the option of Coax or Optical Inputs. If selecting SPDIF Optical, the Optical Out mode must also be set to SPDIF.
SRC Mode: Hilo features a powerful Sample Rate Converter for the AES and SPDIF Inputs. When active, the onboard SRC processor
supports for conversion ratios up to 16:1 with 144 dB dynamic range and -140dB THD+N. The SRC will convert signals on the active
Digital Input up or down to the current Sample Rate. It is also useful for re-clocking signals from devices that cannot operate as a
clock slave. The default state for the SRC is OFF.
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