THE CONTROLS IN MORE DETAIL
MONO INPUT CHANNEL
Balanced
Input
2. Hot(+ve)
3. Cold(-ve)
1. Screen
MIC INPUT
The mic input accepts XLR-type connectors and is designed to suit a wide range
of BALANCED or UNBALANCED low-level signals, whether from delicate vocals
requiring the best low-noise performance or close-miked drum kits needing
maximum headroom. Professional dynamic, condenser or ribbon mics are best
because these will be LOW IMPEDANCE. While you can use low-cost HIGH
IMPEDANCE mics, you do not get the same degree of immunity to interference
on the microphone cable and as a result the level of background noise may be
higher. If you turn the PHANTOM POWER on (top right-hand side of the mixer)
the socket provides a suitable powering voltage for professional condenser mics.
DO NOT use unbalanced sources with the phantom power switched on. The
voltage on pins 2 & 3 of the XLR connector may cause serious damage.
Unplug any mics if you want to use the corresponding LINE Input to avoid the
load presented by the mic from affecting the Line Input gain. The input level is
set using the GAIN knob.
LINE INPUT
Accepts 3-pole A gauge (TRS) jacks. Use this input for sources other than
mics, such as keyboards, drum machines, synths, tape machines or guitars. The
input is BALANCED for low noise and immunity from interference, but you can
use UNBALANCED sources by wiring up the jacks as shown below, although
you should then keep cable lengths as short as possible to minimise interference
pick-up on the cable. Unplug anything in the MIC input if you want to use this
socket. Set the input level using the GAIN knob.
GAIN
This knob sets how much of the source signal is sent to the rest of the mixer.
Too high, and the signal will distort as it overloads the channel and causes
clipping. Too low, and the level of any background hiss will be more noticeable
and you may not be able to get enough signal level to the output of the mixer.
This is shown in the diagram below:
Setting the knob to the U mark gives unity gain for the LINE input. Note that some sound equipment, particularly that
intended for domestic use, operates at a lower level (-10dBV) than professional equipment and will therefore need a
higher gain setting to give the same output level.
See Initial Setting Up on page 10 to learn how to set the GAIN correctly.
100Hz HI-PASS FILTER
Pressing this switch reduces the level of bass frequencies only, and is a
real bonus for a such a small mixer. Use this in live PA situations to reduce
stage rumble or popping from microphones.
Unbalanced
Input
1. Screen
2. Hot(+ve)
Link 3
to 1
Hot (+ve)
Cold (-ve)
Gnd/Screen
Signal
Gnd/Screen
Gnd/Screen
Tip
Ring
Sleeve
Unbalanced
Balanced
If the signal level is too low it may be masked
by the noise.
Signal
Noise
If the signal level is too high, clipping distortion
may occur.
Clipped
Signal
Noise
Balanced Mic Input - XLR
3-Pole Jack
Unbalanced Mic Input - XLR
SPIRIT FOLIO
11
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