Metric Halo 2882 operating guide - Manual (Page 99)

Mobile I/O User’s Guide
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If this is the case, you will generally find that the Mobile I/O will boot on ini-
tial connection, but will then lose power or will reboot repeatedly after a
short period of operation.
Some Mac models provide enough power if they are plugged into the wall,
but will not provide enough power while running on batteries. If the com-
puter does not provide enough power, you will need to use an external
power source with Mobile I/O.
The external power supply provided with Mobile I/O is the perfect solution if
you are using Mobile I/O in an environment where AC power is available.
The external power supply will actually provide power to the bus and can be
user to power other bus-powered peripherals (see “Other Bus Powered
Devices” on page 92).
If AC power is not available, you will need to use an external battery-based
power source to power Mobile I/O. Any source that provides 9V-30V and
can support 12-15W of power consumption will work well with Mobile I/O.
Check with Metric Halo for specific recommendations.
When using an external battery source, DO power Mobile I/O directly from
the battery – not through an inverter. DON’T power the computer with an
external battery and use the computer to power Mobile I/O; doing so will
not resolve your bus power problems, and it will give you more limited run
times. If you need to use the external battery with the computer use two bat-
teries or split the DC supply at the battery and power both the Mobile I/O
and the computer.
H IGH P OWER M ODE
When the Mobile I/O is in High Power mode, the analog power rails are run
at a higher voltage than in standard mode. High Power mode provides
greater output headroom and reduced distortion at high (pro-audio) analog
output levels, but requires substantially higher (>5W) supply power. Most
currently available computers are not able to provide enough current over
the bus to power Mobile I/O in High Power mode. The current transient gen-
erated when the unit is switched to High Power mode can cause damage to
machines that have low bus power limits. We STRONGLY recommend pow-
ering the Mobile I/O from an external power supply if you want to use High