Metric Halo Mobile I/O - Manual (Page 156)

MIO Console Overview
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You can use the trim knob to adjust the analog output level to be consistent with the needs of other
audio gear. This format is appropriate for interfacing with prosumer and consumer audio equipment.
• Monitor (LIO-8/ULN-8 only) — This format incorporates a 30 dB analog domain pad. You can use the
trim knob to adjust the analog output level to be consistent with the needs of other audio gear. The
output impedance is approximately 5 Ω.This format is appropriate for interfacing with amplifiers and
selfpowered speakers.
– Gain Trim knob: The Gain Trim knob allows you to adjust the analog gain of the output stage (post DAC) in
the range determined by the output standard that you have selected; this range will vary by interface model.
The gain is indicated in dB relative to the nominal level of the output standard you have selected. The gain
changes are smoother near the bottom of the scale, with the steps increasing in size as you reach the +40dB
gain limit. Unless the signal is quite low, you will put the output stage into analog clipping well before you
hit the 40dB gain limit.
– Channel Label: This simply labels which channel is associated with the output. Click in the label to edit
the channel name.
– Channel Level Meter: This is a peak reading, high-resolution, fast PPM meter. It shows the pre converter
level of the output signal of the associated channel. The peak hold bar indicates the highest level seen on the
channel since the last reset. You can reset the hold by clicking on the meter. These meters are simply high
resolution versions of the meters shown on the front panel of the box – all the meter data is generated by the
Mobile I/O hardware.
Analog Output Channel Link
In addition to the channel specific controls, each channel pair shares a Link button. When the Link button is
engaged, the trim-value is set to 0 and changes made to one channel of the pair will automatically be applied
to the other channel of the pair. This is very useful if you are driving a stereo monitor section or stereo device.
By engaging the Link button, you will ensure that both channels have precisely the same amount of analog
gain applied post DAC.
Digital Output Meters
To the right of the Analog Output controls is the Digital Meters section. This group of meters provides level
metering for all of the digital outputs on the Mobile I/O. These meters have the same response characteristics
as the analog output meters, and show you the audio activity on ADAT output channels 1-8 and digital output
channels 1-2, going from left to right. The ULN-8 shows AES output channels 1-8.
Please note that when the 2882 and ULN-2 are clocking at 2x rates (88.2-96k), the ADAT output is not
useable. Both channels of the stereo digital output remain active at all sample rates on the 2882 and
ULN-2.
The label above the bank of 8 channel meters is a pop-up control that allows you to select between ADAT
optical format and TOSLINK Optical SPDIF for the optical output connector. Click on the control to pop-up
a menu to select between the different modes of operation. The mode is independently selectable for both
the input and output.
If you have selected TOSLINK for either the input or output section, you will only see meters for channels
1+2 of the optical digital section. These correspond to the levels that are being transmitted or received in the
optical SPDIF signal.
Box Info
The Box Info section of the panel, in the lower right-hand corner of the window, shows you information
about the currently connected and selected Mobile I/O unit. This section displays the Serial Number, Model
Information and Firmware revision of the connected box as well as the Driver revision. All of this information
can be useful in trying to track down any connection problems that may arise.