American DJ DJ Equipment Mix8s User Manual

SPECIFICATIONS  
1
2 3 4 5  
+ .5 dBm 20 Hz to 20 kHz  
Frequency Response  
CHANNEL1  
CHANNEL  
5
2
CHANNEL  
5
3
CHANNEL  
5
CHANNEL  
5
5
CHANNEL  
5
6
CHANNEL7  
CHANNEL  
8
6
4
MASTER  
PHONES  
5
+3 dBm 7 Hz to 58 kHz  
5
5
5
5
4
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
4
6
4
6
Input Impedance  
3
3
3
3
3
3
3
3
3
1
3
1
7
7
7
7
7
7
7
7
7
9
7
20 k ohm Unbalanced  
All Inputs  
U.S.Audio  
8S  
2
2
2
2
2
2
2
2
2
8
8
8
8
8
8
8
8
8
Maximum Input Level  
1
9
1
9
1
9
1
9
1
9
1
9
1
9
9
9
PHONES  
PHONES  
0
0
0
0
0
0
0
0
0
+21 dBm  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
All Inputs  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
VOLUME  
PWR  
Output Impedance  
8
The U.S. Audio Mix 8S is a stereo line level eight channel mixer with  
separate left and right signal paths. Each of the 8 inputs has left and right  
balanced 1/4“ input jacks. For mono input, the right jack can be used  
alone and it will ”Y” the signal to both left and right busses. The signal is  
actively balanced through differential buffer amps and sent to gain  
circuits. Each channel has a dual element level control with a gain range  
of -60 to +18 dBm, allowing user control over a wide range of input audio  
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  
both master gain stages and to the headphone driver circuit. The left and  
right master outputs are controlled by a stereo volume pot which has a  
gain range of -60 to +18 dBm. The 60 dBm of attenuation turns off the  
audiosignalat themainoutputs ifnecessary.  
S
100 ohm  
+22 dBm  
6 uS  
All Inputs  
Maximum Output Level  
Rise Time  
WARNING : TO PREVENT ELECTRIC SHOCK DO NOT  
REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
LEFT  
R
L
U.S. AUDIO  
POWER  
CAUTION  
: TO REDUCE THE RISK OF FIRE AND  
A DIVISION OF WHIRLWIND INC  
ROCHESTER, NY USA  
8
7
6
5
4
3
2
1
ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO  
ANY TYPE OF RAIN OR MOISTURE.  
>60 dBm  
30 ohms  
Stereo Separation  
RIGHT/  
MONO  
ATTENTION : DEBRANCHER AVANT D'OUVRIR  
120 Vac at 60 Hz  
230 Vac at 50 Hz  
25 watts MAX  
Minimum Headphone Impedance  
ALL CONNECTORS BALANCED  
MAIN OUT STEREO TIP+, RING-, SLEEVE GND  
INPUTS  
Noise  
-81 dBm  
-78 dBm  
One Channel Unity Gain  
All Channel Unity Gain  
9 8  
7
6
<.01% 20-20kHz  
-60 to +18 dBm  
60 dBm  
T.H.D. + n  
Range of Gain Controls  
Mute Attenuation  
Total Gain  
36 dBm  
BLOCK DIAGRAM  
CONTROLS AND FUNCTIONS  
INTRODUCTION  
THEORY OF OPERATION  
.15 Amps Max. A.C. At 120 VAC  
.15 Amps Max. A.C. At 230 VAC  
Power Consumption  
+105 VAC at 120 V nominal  
+205 VAC at 230 V nominal  
AC Dropout Voltage  
Size  
+
BUSS  
LEFT  
Single Space Standard E.I.A Spec  
19.0“(482.6mm) Width  
6.0“(152.4mm) Depth  
1.75“(44.45mm) Height  
LEFT  
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.  
Thank you for selecting the U.S. Audio Mix 8S stereo line mixer. This  
mixer represents an excellent value for monitoring and mixing multiple  
stereo feeds, delivering the highest quality audio performance in a  
compact one rack space package. The U.S Audio Mix 8 is a true stereo 8  
channel 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 stereo channel level controls, and a  
headphone monitor circuit with individual volume control. The Mix 8S  
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.  
_
OUT  
MASTER  
VOLUME  
SUM AMPS  
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.  
+
_
Weight  
RIGHT  
OUT  
BUSS  
RIGHT  
7.5 lbs (3.40 kg)  
6.0 lbs (2.72 kg)  
Shipping Weight  
Unit Weight  
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.  
TYPICAL OF 8  
HEAD  
PHONES  
+
_
HEAD  
PHONE  
VOLUME  
4. POWER LEDindicates that the unit is turned on.  
BUSS  
LEFT  
LEFT  
TOP  
5. HEADPHONE JACK drives stereo headphones with impedances  
greater than 30 ohms and is wired with left to tip and right to ring.  
The Mix 8S headphone circuit monitors the left and right busses 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 78 dB below 0 dB will all channels up at unity.  
The Mix 8s 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.  
CHANNEL  
VOLUME  
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE  
RIGHT  
MONO  
BOTTOM  
+
_
UNPACKING  
6. LEFT AND RIGHT INPUT JACKS for each of the 8 channels are  
balanced 1/4“ TRS. For mono input, the right jack can be used alone and  
it will ”Y” the signal to both inputs.  
BUSS  
RIGHT  
7. LEFT AND RIGHT MAIN OUT JACKS controlled by the front master  
volume pot are balanced 1/4“ TRS and will drive balanced or  
unbalanced inputs.  
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.  
POWER LED  
+18 VOLTS DC  
-18 VOLTS DC  
POWER  
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.  
NEG  
HOT  
JUMPERS  
FOR  
120/230  
VOLTS  
U.S.Audio  
TM  
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.  
¼ AMP  
SLOW  
BLOW  
8
CHASSIS GROUND  
S
 

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