whirlwind / U.S. Audio
Operations Manual
MIX-5/MIX-5s
UNPACKING
INTRODUCTION
US Audio has made every 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. We recommend that you save
your packaging material for use in the unlikely event
that you will need to return your equipment for
service.
Thank you for selecting the US Audio Mix 5. Both
the Mix 5 Stereo and the Mix 5 Mono offer excellent
value, delivering the highest quality audio
performance at a low cost. Either unit provides up to
55dB of gain, with signal to noise ratios that
approach digital quality and still have 10 to 15dB of
headroom. With a full complement of hook-up
hardware, both mixers are 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.
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CONTROLS AND CONNECTIONS
1. Channel Volumes control input signals over a range of
60dBm attenuation at full off to 20dBmof gain at full on.
common, wired to sleeve. Audio ground is not connected to
chassis ground.
2. Pan Pots (Mix 5 Stereo only) are dual pots with center
detent, providing over 65dB of stereo isolation from left to
right channel. The center detent allows convenient and
accurate setup, feedingsignal equallyto both channels.
9. Input Mic/Line Switch is engages an active circuit that
applies 20dB of gain when in the Mic position. This gain is
applied to both input jacks. For most input signals the Out
or Line position will be appropriate.
3. Aux Input Pot controls the rear panel RCA input jacks.
Input signals are actively summed in the Mix 5 Mono, and
maintain stereo separation in the Mix 5 Stereo. Again, with
a range of -60 to +20dB of gain, the Mix 5 Aux input will
interface easily with most types of gear.
10. Output Male XLR Jack (left for stereo) is balanced
with pin 2 positive, pin 3 negative and pin 1 audio ground.
For unbalanced operation use pins 1 and 2 leaving pin 3
UNCONNECTED. To internally lift pin 1 from common,
open the unit and cutjumper JMP84.
4. Master Volume Pots (one for Mix 5 Mono) determine
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 +20dBm.
11. Output Mic/Line Switches affect only the XLRoutput
jack(s) by inserting a 20dB pad across pins 2 and 3 when in
the Mic position.
12. Output 1/4” TRS Jack delivers the same signal as the
XLR but has a separate driver circuit providing complete
isolation from the XLR output. May be used either
balanced with a TRS plug or unbalanced with a TS plug.
Tip is positive, ring is negative and sleeve is audio ground.
This jack can drive high impedance headphones directly,
although one side is out of phase. A properly wired adapter
cable can provide monitoring capabilities.
5. LED dB Indicators are precisely calibrated in 3dB
increments and span a range of -15 to + l2dBm, measured
unbalanced with the input switch in Line mode, at either
the 1/4” output or the XLR output. (Add 6 dB for balanced
output).
6. Phantom Power for each of the four input XLR jacks
is activated by the rear panel pushbutton switch. Status is
indicated by the front panel LED. Each channel is
individually filtered to eliminate crosstalk through the
supply rail. The Mix 5 supplies l8VDC with current
limiting resistors chosen to ensure that the phantom supply
will not fall below the AES minimum specification of
l2VDC at a 5.2mA current draw. Most condenser type
microphones draw between 1 and 3mA and will operate
from 12 to 48VDC.
13. Output 1/4” TRS Jack is connected to the right output
and is identical to #12 above for the Mix 5 Stereo. It
provides a second active isolated TRS output in the Mix 5
Mono.
14. Output Male XLR Jack and Mic/Line Switch appear
only on the Mix 5 Stereo and operate identically to #10 and
#11 above, providing theright channel output. To internally
lift pin 1 from common, open the unit and cut jumper
JMP85.
7. Power Switch connects AC to the transformer primary
and the LED indicates that the unit is receiving power.
Both sides of the AC line are switched and a mains fuse is
located on the circuit board insidethe unit.
15. Power Cord has a standard 15 amp plug for l20VAC
and has no plug on the Mix 5MX or Mix 5sX 230VAC
export models. Black is line, white is neutral and green is
earth.
8. Input 1/4” TRS and XLR Jacks are AC-coupled
through phantom blocking capacitors with pin 2 positive,
wired to tip, pin 3 negative, wired to ring, and pin 1
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SPECIFICATIONS
Frequency Response
Line mode
± 3dB, 6Hz to 36kHz
-0.4dB @ 20Hz
-1dB @ 20kHz
Mic mode
± 3dB, 18Hz to 36kHz
-2.5dB @ 20Hz
-1dB @20kHz
Maximum Input Level
Line mode
+22 dBm unbalanced
+28 dBm balanced
Mic mode
- 2 dBm unbalanced
+4 dBm balanced
Input Impedance
Line mode
Mic mode
2k Ohm balanced or unbalanced
600 Ohm balanced
2k Ohm unbalanced
Maximum Output Level
Balanced
+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
8uSec
Stereo Separation
>65dBm
C.M.R. (Common Mode Rejection) of Input
> 55dBm @ 60Hz
Attenuation Of Llne/Mic Output Switch
20dBm
Isolation Between 1/4” and XLROutputs
>l00dBm
Aux Input Impedance
10k Ohms
+22dBm
Maximum Level Aux Input
THD+N (Total Harmonic Distortion + Noise)
Line Mode @ l4dBm of Gain .005%
Line Mode @ Unity Gain
.012%
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Equivalent Input Noise
Headroom
(dBm)
Input Level
(dBm)
Input Mic/Line
Gain
S/N Ratio
(dBm)
E.I.N.
Switch Position
(dBm)
(dBm)
+ 10
0
Line
Line
Line
Line
Mic
0
13.8
13.4
12.3
12.2
28
88.3
87
-88.3
-87
0
0
10
10
30
40
50
14
14
85
-75.3
-69.2
-76
-10
-20
-30
-40
-10
-10
79.2
86
Mic
12.5
12.7
18.4
7.8
79.7
72.3
75.8
84
-69.7
-62.3
-71.8
-80
Mic
Line
Mic
whirlwind
99 Ling Road
Rochester NY 14612
800 733-9473
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