Alesis iO14 Reference Manual page 15

7. FireWire Connectors – Connect one of these plugs to your
computer's FireWire port. You can use the other jack to
connect additional FireWire devices (such as hard drives) to
your computer. Up to 127 devices can be "daisy-chained" on
one FireWire bus.
8. Power Connector – Use the supplied AC adapter if your
computer does not provide sufficient Firewire bus power to
power the IO|14/26 or if you want to preserve battery
power.
Note that many notebook and small form factor computers,
like Mac Mini computers, do not provide sufficient power for
bus power. For these computers, the external adapter must
be used.
9. Kensington Security Slot – This locking mechanism allows
you to secure your IO|14/26 to a desk or some other heavy
object using an optional third-party locking device.
Hardware Overview
If an AC adapter is attached,
the IO|14/26 will use it.
FireWire bus power is only
used if no AC power is
available.
Computers with noisy
internal power supplies can
send periodic, audible
pulsing through the outputs of
your IO|14/26. If you hear a
low-level pulsing, plug in the
AC adapter to bypass the
computer's power supply.
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