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46 Onyx 1640i
Appendix F: Modifi cations
The following modifi cations can be carried out on the
Onyx 1640i 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.
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.