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38 Onyx 1220i
Appendix F: Modifi cations
The following modifi cations can be carried out on the
Onyx 1220i by an authorized service center. Authorized
service centers may be found online at:
www.mackie.com/scripts/service_centers/search.asp
Please contact our technical support department if you
are having trouble fi nding an authorized service center
in your area.
The block diagram on page 32 shows these
modifi cations as dotted lines in the channel signal fl ow.
Modifi cations: Post-Insert FireWire Sends
The pre-EQ channel FireWire sends are pre-insert,
but the circuit board can be modifi ed so that they are
post-insert instead.
For example, this allows for the use of an external
processor on the mic signal, sending the result to the
FireWire, while still being pre-EQ.
Modifi cations: Post-Fader FireWire Sends
The post-EQ channel FireWire sends are pre-fader,
but the circuit board can be modifi ed so that they are
post-fader instead.
This allows the channel level to control the level of
the FireWire sends.
Modifi cation: Pre-EQ Aux Sends
The pre-fader aux sends are post-EQ, so they are
affected by the channel EQ controls. The circuit board
can be modifi ed so the pre-fader aux sends are pre-EQ
instead of post-EQ.
For example, your stage monitors will not be affected
by any channel EQ adjustments.