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MODIFICATIONS-O-RAMA
The CR-1604 can be modified to move the
position of AUX Sends and Channel
Inserts in the signal flow. Unless you
have the right tools and have tweaked
with circuitry before, leave these
mods to a pro. Our Official Word on
modifications is: “Any internal
modification of the
CR-1604 MUST be per-
formed by a competent
technician. Mackie Designs ac-
cepts no responsibility in the event of
improperly performed modifications
or other damages and, in such
cases, may declare warranty privi-
leges void.” Be VERY careful!
Here are the most common CR-
1604 modifications, six of which are detailed
on the following pages.
1. CONVERT AUX SENDS TO MONITOR
SENDS (Pre-EQ, Pre-Fader, Pre-Mute/ALT
Switch).
Can be done on any or all of channel strips
1 to 16. Each channel modification requires
cutting one or more circuit traces and adding
a small jumper wire. On each strip, you can
modify Sends 2, 3, 4 or any combination
thereof. Note: Converting AUX 3 will also con-
vert AUX 5; converting AUX 4 will also convert
AUX 6. See the next page.
2. CONVERT AUX SENDS INTO MONITOR
SENDS WITH EQ (Post-EQ, Pre-Fader, Pre-
Mute/ALT Switch).
Can be done on any or all of channel strips
1 to 16. Each channel modification requires
cutting one or more circuit traces and adding
a small jumper wire. On each strip, you can
modify Sends 2, 3, 4 or any combination
thereof. Note: Converting AUX 3 will also con-
vert AUX 5; converting AUX 4 will also convert
AUX 6. See pg. 31.
3. CONVERT AUX SENDS TO IGNORE
MUTE/ALT STATUS (Post-EQ, Post-Fader, Pre-
Mute/ALT Switch).
Can be on any or all of channel strips 1–16.
Converts ALL AUX sends on each channel
strip. Requires cutting a circuit trace, and
adding both a small jumper wire and a
20,000Ω resistor. See pg.32 of this section.
TECH
STUFF
4. CONVERT CHANNEL ACCESS (INSERTS)
TO PRE-EQ / PRE-FADER.
Can be performed on any or all of the first
eight CR-1604 channel strips. Requires cutting
three circuit traces and adding both a small
jumper wire and a 22µf/16V electrolytic cap on
each channel strip. See pg. 33 of this section.
5. CONVERT CHANNEL ACCESS (INSERTS)
TO POST-EQ / PRE-FADER.
Can be performed on any or all of the first
eight CR-1604 channel strips. Requires cut-
ting three circuit traces and adding both a
small jumper wire and a 22µf/16V electrolytic
cap on each channel strip. See pg. 34 of this
section.
6. TIE SOLO TOGETHER ON TWO OR MORE
CR-1604s.
See pg. 35 of this section.
+15–15
0
HI
+15–15
0
MID
+12–12
0
LO
EQ
+20
U
00
MUTE
ALT 3/4
1
PREAMP
EQ CH. FADER
MUTE
ALT 3/4
INPUT
TO
MAIN
1/2
BUS
TO
ALT
3/4
BUS
STOCK
AUX SEND
MOD 1 MOD 3MOD 2
POST-EQ
POST-FADER
PRE MUTE/ALT
POST-EQ
PRE-FADER
PRE MUTE/ALT
PRE-EQ
PRE-FADER
PRE MUTE/ALT
MOD 4
STOCK CHANNEL
ACCESS JACK
MOD 5
POST-EQ
POST-FADER
PRE MUTE/ALT
POST-EQ
PRE-FADER
PRE MUTE/ALT
PRE-EQ
PRE-FADER
PRE MUTE/ALT
POST-EQ
POST-FADER
POST MUTE/ALT
AUX SEND mods
CHANNEL ACCESS mods