Frequency Response
Input Impedance
All Inputs
Maximum Input Level
All Inputs
Output Impedance
All Inputs
Maximum Output Level
Rise Time
Stereo Separation
One Channel Unity Gain
All Channel Unity Gain
T.H.D. + n
Range of Gain Controls
Mute Attenuation
Total Gain
Power Consumption
AC Dropout Voltage
Size
Weight
Shipping Weight
Unit Weight
+ .5 dBm 20 Hz to 20 kHz
+3 dBm 7 Hz to 58 kHz
20 K ohm Unbalanced
+21 dBm
100 Ohm
+22 dBm
6 uS
>60 dBm
-81 dBm
-76 dBm
.015%
-60 to +18 dBm
60 dBm
36 dBm
.15 Amps Max. A.C. At 120 VAC
.15 Amps Max. A.C. At 230 VAC
+105 VAC at 120 V nominal
+205 VAC at 230 V nominal
Single Space Standard E.I.A Spec
19.0“(482.6mm) Width
6.0“(152.4mm) Depth
1.75“(44.45mm) Height
7.5 lbs (3.40 kg)
6.0 lbs (2.72 kg)
1. INPUT LEVEL CONTROL
varies the amount of signal sent to the
master left and right busses through a range of 60 dBm attenuation at full
off to +18 dBm of gain full on.
2. MASTER VOLUME CONTROL
determines the amount of signal from
the summing amps that is fed to the left and right outputs. This also has a
gain range of -60 to +18 dBm.
3. HEADPHONE VOLUME CONTROL
varies the signal at the
headphone jack. The signal going into the headphone circuit is pre
master fader and independent of the master volume pot.
4. POWER LED
indicates that the unit is turned on.
5. HEADPHONE JACK
drives stereo headphones with impedances
greater than 30 ohms and is wired with left to tip and right to ring.
6. INPUT JACKS
for each of the 16 channels are balanced 1/4“ TRS.
7. MAIN OUT JACKS
controlled by the front master volume pot are
balanced 1/4“ TRS and will drive balanced or unbalanced inputs. Each
jack has a separate drive circuit.
8. POWER SWITCH
connects AC to the transformer primary and the
front panel LED indicates that the unit is working. Both sides of the AC
line are switched and the main fuse is located on the circuit board inside
the unit.
9. POWER CORD
has a standard 15 amp plug for 120 VAC and has no
plug on the Mix 8s 230 VAC model. Black is line, white is neutral and
green is earth.
U.S. Audio has made every effort to ensure that your equipment is
received in the same perfect condition it was when it left the factory.
Please inspect your product for any signs of damage during shipping
and report them to your dealer so that a claim can be made to the
shipper. We recommend that you save your packing material for use in
the unlikely event that you need to return your equipment for service.
Thank you for selecting the U.S. Audio Mix 16 line mixer. This mixer
represents an excellent value for monitoring and mixing multiple feeds,
delivering the highest quality audio performance in a compact one rack
space package. The U.S Audio Mix 16 is a 16 channel balanced line level
mixer, designed for use in broadcast production, as a studio mixdown /
monitor mixer for multitrack recorders or in countless other applications.
Features include channel level controls, and a headphone monitor
circuit with individual volume control. The Mix 16 can provide up to 36 dB
of gain, with a professional quality signal to noise ratio and full frequency
response. All connections are made through balanced 1/4“ tip-ring-
sleeve jacks.
U.S.Audio
PHONES
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
PWR
16
15
1
3
5
7
9
11
13
MASTER
PHONES
VOLUME
0
5
10
CHANNEL
2
0
5
10
4
CHANNEL
0
5
10
6
CHANNEL
0
5
10
8
CHANNEL
0
5
10
10
CHANNEL
0
5
10
12
CHANNEL
0
5
10
14
CHANNEL
0
5
10
16
CHANNEL
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
PHONES
PHONES
POWER
2
INPUTS
120 Vac at 60 Hz
230 Vac at 50 Hz
25 watts MAX
U.S. AUDIO
A DIVISION OF WHIRLWIND INC
ROCHESTER, NY USA
1
4
3
6
5
8
7
10
9
12
11
14
13
16
15
: TO PREVENT ELECTRIC SHOCK DO NOT
REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
: TO REDUCE THE RISK OF FIRE AND
ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO
ANY TYPE OF RAIN OR MOISTURE.
: DEBRANCHER AVANT D'OUVRIR
WARNING
CAUTION
ATTENTION
MAIN OUT MONO
ALL CONNECTORS BALANCED
TIP+, RING-, SLEEVE GND
1
2
3
5
4
6
7
8
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
SPECIFICATIONS
UNPACKING
U.S.Audio
INTRODUCTION
THEORY OF OPERATION
CONTROLS AND FUNCTIONS
BLOCK DIAGRAM
JUMPERS
FOR
120/230
VOLTS
POWER
CHASSIS GROUND
¼ AMP
SLOW
BLOW
HOT
NEG
POWER LED
+18 VOLTS DC
-18 VOLTS DC
BUSS
MASTER
HEADPHONE
VOLUME
+
_
+
_
HEAD
PHONES
OUT 1
OUT 2
VOLUME
TM
CHANNEL
VOLUME
BUSS
+
_
TYPICAL 1 OF 16
U.S. AUDIO MIX 8 &16 MANUAL
9
The U.S. Audio Mix 16 is a stereo line level mixer with 1/4“ tip-ring-
sleeve input jacks. Each input signal is actively balanced through a
differential buffer amp and sent to the channel gain circuit. Each channel
has a level control with a gain range of -60 to +18 dBm, allowing
operation with a wide range of input volume levels. Unity gain is at the 12
o’clock position for both channel volume and the master volume.
Signals from individual channels are summed together and delivered
to the master gain stages and to the headphone driver circuit. There are
two main output jacks controlled by a single volume pot which has a gain
range of -60 to +18 dBm. Each output jack is balanced (tip is positive)
and driven by a separate circuit. The 60 dBm of attenuation turns off the
audio signal at the main outputs if necessary.
The Mix 16 headphone circuit monitors the summing buss and will
drive stereo headphones with impedances greater than 30 ohms. The
front panel stereo 1/4“ headphone jack has a volume control with a
range of -60 to +18 dB. The signal going into the headphone circuit is a
pre master fader.
Careful layout of the circuit board and a star grounding scheme
ensure no internal ground loops between channels and / or sections of
circuitry. Using low noise components, noise is 81 dB below 0 dB at unity
gain, with one channel up and 76 dB below 0 dB with all channels up at
unity.
The Mix 16 utilizes a dual transformer power supply which is
configured with internal jumpers for 120 VAC 60 Hz or 230 VAC 50 Hz
operation. There is an internal fuse on the hot side of the AC cord, and
the power switch makes and breaks both the hot and neutral legs of the
AC cord.
MIX 16 MONO REVISION 2.1
99 Ling Road
Rochester, NY 14612
Phone 716 663-8820
Fax 716 865-8930
Email: Sales@whirlwindusa.com
http://www.whirlwindusa.com
