Whirlwind Music Mixer MIX 6 User Manual

U.S. Audio  
whirlwind  
OPERATIONS MANUAL  
Mix 6  
STEREO MIXER  
UNPACKING  
INTRODUCTION  
US Audio has made e\'erv effort to ensure that your equipment is received  
in the same perfect condition it was in when it left the factory. Please  
inspect your product for any signs of damage during shipping and report  
them to your dealer so that he can present a claim to the shipper. \Ve  
recommend that you save your packaging material for use in the unlikely  
event that you need to return your equipment for service.  
Thank you for selecting the US Audio Mix 6. The Mix 6 delivers the ultimate  
in sonic performance for the most demanding professional mic and line  
mixing applications. Utilizing the Analog Devices 2017 IC, a carefully  
wound toroidal power transformer, trUe star grounding, plus many other  
design features, the Mix 6 has a working signal to noise ratio (S/N) of 92db  
with 22dB headroom at unity gain! At 40dB of gain the Mix 6 holds a working  
S/N of 85dB making it ideally suited for production with digital recording  
media. The Mix 6 can provide up to 76dB of gain, with a professional quality  
signal to noise ratio and still have 10 to 15dB of headroom. Other features  
include 2 stereo aux inputs, one of which can be used as a separate monitor  
input, a stereo peak limiter, low cut filters and a headphone circuit. \Vith a full  
complement of hook-up hardware, the Mix 6 is capable of handling any  
configuration of line or mic level signals as well as any combination of  
balanced or unbalanced XLR and 1/4” connectors.  
 
the “in” position and lifts the signal when “out”. Signal to the headphone switch is  
always on.  
CONTROLS AND CONNECTIONS  
1. Channel Volume Pots control input signals over a range of  
7. Master Volume Potsdetermine the amount of signal from the summing amps  
that is fed to the output drivers and the meters. These also have a gain range of -60 to  
i-2OdBm.  
6OdBm attenuation at full off to 2OdBm of gain at full on.  
2. Pan Pots aredual pots with center detent, offering over 65dB of stereo isolation  
from left to right channel. The center detent allows convenient and accurate setup,  
feedingsignal equallytobothchannels.  
8. LED dB Indicators are precisely calibrated at 3dB increments and span a range  
of -15 to +l2dBm measured unbalanced at the 1/4” output. The output of the XLR,  
withthe switchinLine mode, is6dBgreater.  
3. Low frequency Cut Switch for reduction of wind noise, etc. The cutoff  
9. Stereo Peak Limiteris pre master fader and is switchable in or out of the signal  
path. Threshold is set at 0dB and limiting up to 15dB is possible. The left and right  
LEDs on the front panel illuminate when the limiter is working and get brighter as  
limiting increases. Attack time is fast and the ratio is approximately 4:1.  
frequency is 120Hz with a 24dB slope.  
4. OL (Over Load) LEDilluminates when the level is 3dB below distortion. The  
clip circuit senses the signal level at the input diff amp and after the channel gain.  
10. Stereo Headphone Circuit consists of a source select switch, a volume  
control, a 1/4” TRS headphone jack and will drive any headphones with 20 ohms or  
greater impedance. The volume control has a gain range of -60 to +20db. The select  
switch feeds either the prefader stereo master signal or the aux 2 postfader signal to  
the headphone amplifier.  
5. Aux 1 Input Pot controls the rear panel RCA jacks. Aux I is a stereo unbalanced  
circuit feeding the left and right busses. This control has a gain range of -60 to -~-  
20dB.  
6. Aux 2 Input Pot controls the rear panel stereo 1/4” TRS balanced jacks through  
a gain range of -60 to +20dB. Postfader signal is fed to the headphone select switch  
“mon' position allowing aux 2 to become an external input to the headphone circuit.  
The main/off switch routes the aux 2 input signal to the left and right stereo busses in  
11. LED Indicators for Phantom Power and Unit Power illuminate  
when rear panel switches are activated.  
 
12. Input 1/4 TRS and XLR Jacks are AC coupled through  
phantom blocking capacitors with pin 2 being positive wired to tip,  
pin 3 being negative wired to ring and pin 1 being common wired to  
sleeve.  
19. Phantom Power Switch activates 48V DC on channel 1-4 XLR  
inputs. Status is indicated by the front panel LED. Each of the mic  
inputs is filtered to eliminate crosstalk through the supply rail and  
phantom powerisisolatedfrom the TRSjacks.  
13. Input MidLine Switch is connected to an active circuit and  
turns on 36dB of gain when pushed in to the Mic position. This gain is  
appliedtobothinput jacks.  
20. Ground Lift Switch connects the audio circuit ground to AC  
ground and the chassis of the unit, if desired.  
14. Left and rightUnbalanced RCA Jacksfor aux 1 input.  
15. Left and rightBalanced 1/4 TRS Jacksfor aux2 input.  
21. 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 a mains fuse is located on the circuit board  
inside the unit.  
16. Output Mic/Line Switches affect only the XLR output jacks by  
inserting a 20dB pad across pins 2 and 3 in the Mic position.  
22. Power Cord has a standard 15 amp plug for l2OVAC and has no  
plug on the Mix 6X 23OVAC models. Black is line, white in neutral  
and green is earth.  
17. Output Male XLR Jacks are balanced with pin 2 being  
positive, pin 3 being negative and pin 1 being audio ground. For  
unbalanced operation use pins  
I
and  
2
leaving pin  
3
UNCONNECTED. To internally lift pin 1 from common, open the  
unit and cut jumper JMP7 for left or JMP6 for right.  
18. Output 1/4 TRS Jack delivers the same signal as the XLR but  
has a separate driver circuit providing complete isolation. May be  
used either balanced with a TRS plug or unbalanced with a TS plug.  
Tipispositive, ringisnegativeandsleeveisaudioground.  
 
INPUT  
MIC/LINE  
SWITCH  
SIGNAL  
TO NOISE  
RATIO  
INPUT  
LEVEL  
HEADROOM  
MAX OUT  
RESIDUAL  
NOISE  
GAIN  
10  
0
0
Line  
Line  
Line  
Line  
Line  
Line  
Mic  
Mic  
Mic  
Mic  
Mic  
Mic  
Mic  
Mic  
0
0
12  
22  
12  
12  
2
101  
91  
92  
82  
82  
72  
105  
95  
85  
86  
76  
76  
66  
68  
-91  
-91  
-82  
-72  
-62  
-59  
-89  
-89  
-85  
-76  
-76  
-66  
-66  
-58  
10  
20  
30  
33  
36  
36  
40  
50  
50  
60  
60  
70  
-10  
-10  
-20  
-20  
-30  
-40  
-40  
-50  
-50  
-60  
-60  
9
6
16  
22  
12  
22  
12  
22  
12  
 
SPECIFICATIONS  
Frequency Response  
Line mode  
LED Clip Threshold  
+19dBm unbalanced  
+25dBm balanced  
± 3dB, 6Hz to 40kHz  
-0.4dB @ 20Hz  
-.8dB @ 20kHz  
THD+N (Total Harmonic Distortion + Noise)  
.005% @ 1kHz  
Mic mode  
± 3dB, 18Hz to 36kHz  
-2.5dB @ 20Hz  
-1dB @20kHz  
.02% 20Hz to 20kHz  
Phantom Power  
+ 48 Volts DC  
Maximum Input Level  
Line mode  
+22 dBm unbalanced  
+28 dBm balanced  
Power Consumption  
.27 Amps MaxAC @ 120 VAC  
.27 Amps Max AC @ 230 VAC  
Mic mode  
Aux 1& 2  
- 14 dBm unbalanced  
+28 dBm balanced  
AC Dropout Voltage  
+103 VAC @ 120VAC Nominal  
+203 VAC @ 23OVAC Nominal  
+22 dBm unbalanced  
+28 dBm balanced  
Internal Mains Fuse  
.25 Amps Slo-Blo 3AG  
Input Impedance  
4k Ohm  
4k Ohm  
Size (Single space standard E.I.A. Spec)  
19.0” (482.6mm) Width  
6.0” (152.4mm) Depth  
1.75” (44.45mm) Height  
Aux 2 Input Impedance  
Maximum Output Level  
Balanced  
Shipping Weight  
Unit Weight  
9 lbs (4.08kg)  
7 lbs (3.18kg)  
+28dBm  
+22dBm  
Unbalanced  
Output Impedance XLRs  
Line mode  
100 Ohms  
200 Ohms  
Mic mode  
Output Impedance TRS  
Unbalanced  
60 Ohms  
Balanced  
120 Ohms  
Rise Time  
8.6uSec  
>65dBm  
Stereo Separation  
Attenuation Of Llne/Mic  
Output Switch  
20dBm  
Isolation Between 1/4” and >100dBm  
XLR Outputs  
C.M.R. (Common Mode  
Rejection) of Input  
> 55dBm @ 60Hz  
whirlwind  
· 99 Ling Road · Rochester NY 14612 · 800 733-9473  
 

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