Whirlwind MIX-5S - Manual (Page 3)

CONTROLS AND CONNECTIONS
1. Channel Volumes control input signals over a range of
60dBm attenuation at full off to 20dBm of gain at full on.
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 deten t allows convenient and
accurate setup, feeding signal equally to both channels.
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.
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.
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.
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 inside the unit.
8. Input 1/4” T RS 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 common, wired to sleeve. Audio ground is not connected to
chassis ground.
9. Input Mic/Li ne Switch is engages an active circuit t hat
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.
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 cut jumper JMP84.
11. Output Mic/ Line Switches affect only the XLR output
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.
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 Mi c/Line Switch appear
only on the Mix 5 Stereo and operate identically to #10 and
#11 above, providing the right channel output. To internally
lift pin 1 from common, open the unit and cut jumper
JMP85.
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.