
1. GENERAL CONFIGURATION. The mixer shall
accommodate 4 microphone signals: mono chan-
nels 1–4; 12 line signals: mono channels 1–4 and
stereo channels 5–12; 2 stereo pairs of Aux Return
inputs; 4 Send/Return channel Inserts; 2 stereo
pairs of Main Mix outputs; 1 stereo pair of RCA-type
Tape Inputs; 1 stereo pair of RCA-type Tape Out-
puts; 1 stereo pair of Control Room outputs; 1
stereo pair of Alt 3-4 outputs; 2 Aux Send outputs;
and 1 stereo headphone output. The mixer shall be
capable of placement on a table or installation in
a standard 19-inch rack mount (using optional rack
rail brackets) and shall be entirely self-contained.
2. MIXER INPUTS.
MONO CHANNELS 1–4: The mixer shall include 4
XDR electronically balanced mic inputs, using XLR-
3-F-type connectors, accepting nominal levels from
–60dBu to +4dBu via 4 rotary Trim controls. 48V
phantom power shall be available via a globally-con-
trolled rocker-type switch. 4 balanced or unbalanced
line inputs shall be wired in parallel, using 1/4" TRS
phone jacks, accepting nominal levels from –45dBu
to +4dBu. The mixer shall include 4 channel Inserts
using 1/4" TRS phone jacks (tip=send, ring=return,
sleeve=ground), delivering and accepting nominal
levels from –10dBV to +4dBu.
STEREO CHANNELS 5/6, 7/8, 9/10 and 11/12: The
mixer shall include 8 bal/unbal line inputs, forming 4
stereo input pairs, using 1/4" TRS phone jacks and
accepting nominal levels from –10dBV to +4dBu.
OTHER INPUTS: The mixer shall include 4 bal/unbal
Aux Return inputs, forming two stereo pairs, using
1/4" TRS phone jacks and accepting nominal levels
from –10dBV to +4dBu. The mixer shall include 1
stereo pair of Tape In jacks, using unbalanced RCA-
type phono jacks, accepting nominal levels from
–20dBV to +4dBu.
3. MIXER OUTPUTS.
MAIN OUTPUTS: The mixer’s Main Output stereo
pairs shall be fitted in three ways: Using balanced
XLR-3-M-type connectors, maximum output of
+28dBu, including 1 Main Output Level switch to
provide 30dB attenuation (XLR outputs only); using
bal/unbal 1/4" TRS phone jacks, delivering nominal
levels from –10dBV to +4dBu; and using unbal-
anced RCA-type phono jacks (labeled TAPE OUT)
delivering nominal levels from –10dBV to +4dBu.
OTHER OUTPUTS: The mixer shall include 1
stereo pair of Alt 3-4 outputs using bal/unbal 1/4"
TRS phone jacks, delivering nominal levels from
–10dBV to +4dBu; 1 stereo pair of Control Room out-
puts using bal/unbal 1/4" TRS phone jacks, deliver-
ing nominal levels from –10dBV to +4dBu; 2 Aux
Send outputs using bal/unbal 1/4" TRS phone jacks,
delivering nominal levels from –10dBV to +4dBu;
and 1 stereo Headphones output using an unbal-
anced 1/4" TRS phone jack (tip=left, ring=right,
sleeve=ground).
4. MIXER INPUT SECTION. Each channel shall include
1 rotary Trim control; 1 Low Cut filter (HPF), providing
an 18dB per octave curve starting at 75Hz; 2 rotary
Aux Send controls, providing up to 15dB above unity
gain; 3 rotary equalization (EQ) controls: +15dB @
12kHz shelving, +12dB @ 2.5kHz peaking and +15dB
@ 80kHz shelving; 1 rotary Pan control, 4dB attenu-
ation panned center; 1 Mute/Alt 3-4 switch, to be
used as a channel mute or to route the signal to the
alternate stereo bus (Alt 3-4); 1 PFL (Pre-Fader Listen
solo) switch; and 1 rotary channel Gain control, provid-
ing up to 20dB above unity gain. Note: The stereo chan-
nels (5/6, 7/8, 9/10 and 11/12) shall not include the
Trim or Low Cut controls.
5. MIXER OUTPUT SECTION. The mixer shall have 1
rotary Main Mix control, providing up to 10dB above
unity gain; 1 rotary Control Room/Phones control,
providing up to 10dB above unity gain; 1 Source
Matrix including 3 switches to deliver any combina-
tion of stereo signals to the Control Room, Phones
and Meters, including Main Mix, Alt 3-4 and Tape,
which shall be replaced by any solo signals resulting
from the engagement of any channel’s PFL switch;
1 Assign to Main Mix switch to deliver the Source
Matrix signals to the Main Mix; 2 rotary Aux Return
level controls, providing up to 20dB above unity
gain; 1 rotary Aux Send 1 Master control, providing
up to 10dB above unity gain; 1 Aux Send 1 global
Pre/Post switch; 1 EFX to Monitor switch, allowing
Aux Return 1 signals to be delivered to Aux Send 1
via the Aux Return 2 level control; and 1 blinking red
Solo LED, to indicate a solo condition.
6. METERING. The mixer shall include 1 stereo 12-segment
LED meter with points at –30, –20, –10, –7, –4, –2, 0, +2,
+4, +7, +10 and 28dB (clip). The source signals for the meters
shall be the same signals selected in the Source Matrix, and
a solo condition shall replace the Source selection with the
soloed channel(s). The meters shall be calibrated so that a
0dBu signal at the Control Room output shall be indicated
as 0dB on the meters, ±1dB.
Architect’ and Engineer’s Specifications