SoundCraft Spirit Folio 4 User Manual

Introduction
Safety Precautions
Connections to Folio 4
The Controls at a glance -

Mono Input Channel
Stereo Input Channel
Groups, Returns & Aux Masters

Master Section
Initial Setting Up
Setting Up for Multitrack Recording
The Controls in More Detail
Applications -

Stereo PA

Stereo PA with Centre Feed

Stereo Recording

4-Track Recording
Glossary

Technical Specifications
System Block Diagram

1
1
2
3
5
7
9
11
12
13
20
21
22
23
24
25
27

Introduction

Thank you for buying a SPIRIT FOLIO 4 mixer, brought to you with pride by the SPIRIT team of Peter, Graham,
Malcolm, Martin, P eter, B rian, George, Colin, T ony, Jam es, M ukesh, Andy , Candy and Simon. W e hope you have
as much fun as we did!

Owning a SPIRIT console brings you t he expertise and support of one of the industry’s leading manuf acturers and
the results of over 20 years experience supporting some of the biggest names in the business.

Built to the highest standards using quality components, FOLIO 4 has evolved from the acclaimed FOLIO mixer
with the addition of 4 Audio Subgroups, 8 Auxiliary Sends, Stereo Effects Returns, Dual VU/PPM Metering and
comprehensive monitoring.

We have designed FOLIO 4 to be an instinctive and simple console to operate, but a few minutes spent reading
this manual will help you to become familiar with the product away from the pressure of a live session, and allow
you to gain full benefit from the superb performance which it offers.

Above all, remember that your S PIRI T mixer is designed to ext end your creativity. The m ore that y ou explore the
controls and the effect they have on the sound output, the more you will appreciate how you can influence and
enhance the final sound.

SAFETY P RECAUTION S

For your own safety and to avoid invalidation of the warranty please read this

section carefully.

The FOLIO 4 desk must only be connected through the Power Supply Uni t

supplied.

The wires in the mains lead are coloured in accordance with the following code:

Green and Yellow: Earth
Blue: Neutral
Brown: Live

As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals
in your plug, proceed as follows:

•• The wire which is coloured Green and Yellow must be connected to the terminal in the
plug which is marked with the letter E or by the earth symbol.

•• The wire which is coloured Blue must be connected to the terminal in the plug which
is marked with the letter N or coloured Black.

•• The wire which is coloured Brown must be connected to the terminal in the plug which
is marked with the letter L or coloured Red.

Ensure that these colour codings are followed carefully in the event of the plug being changed.

To avoid the risk of fir e replace the mains fuse only with the correct value

fuse, as indicated on the label on the power tra nsformer unit.

1

SPIRIT FOLIO 4

These sockets accept 3-pole `A'
gauge (TRS) jacks. Use these inputs
for sources such as keyboards,
drum machines, synths, tape
machines or as returns from
processing units. The inputs are
BALANCED for low noise and
immunity from interference, but you
can use UNBALANCED sources by
wiring up the jacks as shown,
although you should then keep
cable lengths as short as possible to
minimise interference pick-up.

These jacks are an ideal
place to connect the playback
of a tape machine or the output of

an effects unit, without using up any
of the LINE inputs. The input is
unbalanced.

The mic input socket at the rear of the
mixer accepts XLR-type connectors and
is designed to suit a wide range of
BALANCED or UNBALANCED low-level
signals. Professional dynamic,
condenser or ribbon mics are best
because these will be LOW
IMPEDANCE and therefore offer best
noise immunity. Each mic input has a
switch to turn on +48V PHANTOM
POWER providing a suitable powering
voltage for professional condenser
mics. DO NOT use unbalanced sources
with the phantom power switched on.
The voltage on pins2&3oftheXLR
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.

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.

Connects to the Folio 4
Power Supply.

These independent unbalanced
outputs are post Mix Insert, pre-fader,
and are ideal for recording concerts
to -10dBV tape inputs.

SPIRIT FOLIO 4

These are pairs of unbalanced
inputs suitable for tape playback or
outputs from reverb units or other
effects. The inputs are suitable for
signals at -10dBV level (gain
clockwise) to +4dBu.

2

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 (shown by illumination of the PEAK LED),
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.
Setting the knob to the `U' mark gives unity gain for the LINE input.

Pressing this switch reduces the level of
bass frequencies only, and is a real bonus
on a compact mixer.
Use this in live PA situations to reduce stage
rumble or `popping' from microphones.

Turn to the right to boost high
(treble) frequencies by up to
15dB, adding crispness to
cymbals, vocals and electronic
instruments. Turn to the left to
cut these frequencies by up to
15dB, reducing hiss or
over-emphasis of
high-frequency consonants,
which can occur with certain
types of microphone. Set the
knob in the centre-detented
position when a flat response
is required.

There are two knobs which work together to form a SWEPT
MID EQ. The lower knob provides 15dB of boost and cut,
just like the HF EQ knob, but the frequency at which this
occurs can be set by the upper knob over a range of 250Hz
to 6kHz. This allows some truly creative improvement of the
signal in live situations, because this mid band covers the
range of most vocals. Set the lower knob to the
centre-detented position when not required.

Turn to the right to boost low
(bass) frequencies by up to
15dB, adding warmth to vocals
or extra punch to synths,
guitars and drums. Turn to the
left to cut low frequencies by
up to 15dB for reducing hum,
stage rumble or to improve a
mushy sound. Set the knob to
the centre-detented position
when not required.

These sends are always PRE-FADE,
PRE EQ and are unaffected by the ON
switch. They would typically be used
for Foldback or Monitor feeds, for
which it is important that the send
should be independent of the fader so
that, for instance, the mix to artists
headphones or monitor wedge is not
affected by changes in fader level.

This control sets the
amount of the channel
signal feeding the Right
and Left MIX or GROUP
outputs, allowing you to
move the source
smoothly across the
stereo image. Rotation
fully anticlockwise feeds
the signal solely to the
Left mix bus, Group 1 or
Group 3, while rotation
clockwise sweeps the
image to the right bus,
Group 2 or Group 4.

3

e

For further detail
see page 13

The Equaliser (EQ) allows precise manipulation of the sound,
particularly to improve the sound in live PA applications where the
original signal is often far from ideal. There are three sections, HF,
MID and LF giving the sort of control usually only found on much
larger mixers. The EQ knobs can have a dramatic effect, so use
them sparingly and listen carefully as you change any settings so
that you get to know how they affect the sound.

The EQ switch bypasses the Equalisation section when released and
places it into the channel path when pressed. It would typically be
used for simple comparison of the equalised and unequalised signal.

This send can be set pre-fade, pre-EQ or
post-fade as required by the AUX 3 PRE
switch on the Master Section.

These are always POST-FADE and would normally be used to
drive effects processing units which are fed back into the mixer
and which must fade out with the input channel. Aux 4 is an
individual mono send, while the 5/6 STE knob feeds the
channel signal via the PAN control (see below) as a stereo pair
to either Aux outputs5&6or,with the 7-8 switch pressed, to
Aux outputs7&8.

These controls route the input channel signal
to any one or more of eight Auxiliary busses,
which combine the sends from each channel,
mixing them to separate outputs on the rear of
the mixer. Since they are independent of the
main outputs they can provide additional
sources for foldback, effects processors or
extra loudspeaker `fills'. Leave the knobs
turned fully anticlockwise when not in use.

The ON switch turns on all post-fade
outputs from the channel when pressed.
Note that the Insert point is unaffected
by the ON switch.

The linear FADER gives you smooth control
of the overall signal level in the channel
strip, allowing precise balancing of the
various source signals being mixed to the
Master Section.

The input channel signal is always routed to MIX or GROUPS
as selected by the two ROUTING switches. The upper switch
selects MIX when released or GROUPS when pressed, while
the lower switch chooses between Groups 1-2 when released
or Groups 3-4 when pressed.

This LED indicator warns when an
excessively high signal level is
present in the channel and will
illuminate approximately 4dB before
clipping

When the latching PFL switch is pressed, the pre-fade signal is fed
to the headphones or monitor outputs, replacing the selected
source (either Mix or Tape Return). The signal is also displayed on
the right PPM meter. This is a useful way of listening to any one or
more signals without interrupting the main mix, for adjusting signal
quality or to set the input GAIN.

4

Most professional equipment uses input and output levels of +4dBu, but
semi-professional tape machines or hi-fi systems use a lower level of -10dBV.
This switch allows you to match the sources connected to the Stereo input jacks to
either standard, which is important to ensure the best possible sound quality. If
you are not sure what input level is appropriate, start with the switch UP to select
+4dBu. If you are unable to achieve an adequate signal level, press the switch
in for -10dBV.

HF EQ Turn to the right to boost high (treble)
frequencies, adding crispness to percussion from
drum machines, synths and electronic
instruments. Turn to the left to cut these
frequencies, reducing hiss or excessive
brilliance. Set the knob in the centre-detented
position when not required. The control has a
shelving response giving 15dB of boost or cut at
a fixed frequency.

The EQ switch disables the
equaliser when released and
activates it when pressed. It
would typically be used for
simple comparison of the
equalised and unequalised
signals.

LF EQ Turn to the right to boost low (bass)
frequencies, adding extra punch to synths,
guitars and drums. Turn to the left to reduce
hum, boominess or improve a mushy sound.
Set the knob to the centre-detented position
when not required. The control has a shelving
response giving 15dB of boost or cut at a fixed
frequency.

These sends are always PRE-FADE, POST EQ
and are not affected by the position of the ON
switch. They would typically be used for
Foldback or Monitor feeds, for which it is
important that the send should be independent
of the fader so that, for instance, the mix to
artists headphones is not affected by changes in
fader level.

5

e

For further detail
see page 16

These controls route the input channel signal to
any one or more of eight Auxiliary busses,
which combine the sends from each channel,
mixing them to separate outputs on the rear of
the mixer. Since they are independent of the
main outputs they can provide additional
sources for foldback, effects processors or extra
loudspeaker `fills'. Leave the knobs turned down
when not in use.

This send can be set pre or post-fade as required
by the AUX 3 PRE switch on the Master Section.

These are always POST-FADE and would normally be used to
drive effects processing units which are fed back into the mixer
and which must fade out with the input channel. Aux 4 is an
individual mono send, while the 5/6 STE knob feeds the
channel signal via the BAL control (see below) as a stereo pair
to either Aux outputs5&6or,with the 7-8 switch pressed, to
Aux outputs7&8.This is particularly useful to feed the
growing number of stereo effects units now available.

The ON switch turns on all
post-fade outputs from the
channel when pressed.

This control sets the amount of the channel signal feeding the
Right and Left MIX outputs, allowing you to balance the
source in the stereo image. When the control is turned fully
right or left you feed only that side of the signal to the mix.
Unity gain is provided by the control in the centre-detented
position.

The input channel signal is always routed to MIX or GROUPS
as selected by the two ROUTING switches. The upper switch
selects MIX when released or GROUPS when pressed, while
the lower switch chooses between Groups 1-2 when released
or Groups 3-4 when pressed.

The linear FADER gives
you smooth control of the
overall signal level in the
channel strip, allowing
precise balancing of the
various source signals
being mixed to the
Master Section.

PFL When the latching PFL switch is
pressed, a pre-fade mono sum of the
channel signals is fed to the headphones or
monitor outputs, replacing the selected
source (either Mix or Tape Return) and is
also shown on the right PPM meter. This is
a useful way of listening to any one or
more signals without interrupting the main
mix, for adjusting signal quality or to check
the input level.

6

Two Stereo Return sections each comprise a pair of
unbalanced inputs suitable for -10dBV or +4dBu sources. A
mono signal may be plugged into the Left socket only for
each pair to be fed equally to left and right busses. Each
section is provided with a routing switch to select between a
pair of Groups (switch released) or MIX (switch pressed).
Stereo ReturnsA&Bfeed Groups 1 and 2, while Returns C
& D feed Groups 3-4.

AUX 3 PRE The input channels provide both Pre- and Post-Fade
AUX 3 sends which may be selected desk-wide on the Master
Section. Press the AUX 3 PRE switch to make all of the AUX 3
Sends on the channel strips PRE-FADE. This means that they will
all be unaffected by the position of the channel faders, making
them ideal for FOLDBACK or MONITORING.

7

e

For further detail
see page 18

MASTER LEVEL Each of the Auxiliary Send busses is provided
with a rotary master level control. Aux 1-4 are individual
controls, while Aux 5/6 and Aux 7/8 are stereo pairs.

A MONO switch is provided to turn Aux
7/8 into summed mono outputs if a greater
number of mono sends is required. Note
that in this instance the position of the
channel PAN and BAL controls may affect
the Aux 7/8 output level.

Just like the PFL switches on the channels, you can monitor the AUX 1-4 outputs by
pressing the AFL (After Fade Listen) switch, routing the AUX output signal to the
MONITOR or PHONES.

The RIGHT PPM METER also switches from the selected source to display the PFL/AFL
signal and the PFL/AFL LED lights to warn that a PFL or AFL switch is pressed.
When you let go of the switch the Monitor returns to the previous source.

Each pair of Groups may feed post-fade to two Aux
busses as a stereo pair, with a choice of Aux 5/6 or
7/8 depending on the position of the 7-8 switch. These
controls will be found particularly useful for sending to
reverb units, chained reverb effects, side fill feeds,
alternate PA stacks or individual zones in clubs.

Two pairs of audio GROUPS may be fed from the
Channels or Stereo Returns to form subgroups or
separate controllable outputs..

MIX routes the Groups as a stereo pair to Mix
Left/Right (Group1&3toMixLeft, Groups2&4to
Mix Right).

The FADERS control overall GROUP level to the chosen
destination.

8

A built-in 1kHz OSCILLATOR provides a test tone for system tests or
aligning Tape Machines. Press the switch to turn ON the oscillator and
feed a 1kHz tone to the MIX and GROUP outputs at a fixed level.

DON’T DO THIS DURING A LIVE PERFORMANCE, OR WITH THE
AMPLIFIERS TURNED UP HIGH - a sudden, very loud burst of tone will
not do your ears or your loudspeakers any good! The mauve cap colour
indicates that this button must be used with caution.

The three colour PPM Bargraph Meters follow the
Monitor selection to show the level of the stereo MIX
outputs or 2-Track Tape Return, Groups, Auxs or
Stereo Returns giving you a constant warning of
excessive peaks in the signal which might cause
overloading. You should aim for an average reading of
+6/+9 if the mix contains a high proportion of high level
transients and a lower reading of around ‘0’ for
steadier signals with the Master Faders at about the
‘0’ mark.

This group of switches selects
a choice of sources for the
STEREO LISTEN switch
(see below). Any combination
may be selected as required.

The three-colour VU Bargraphs display the MIX signal at all times, and
sample the signal after the Balance control and Insert point. The ‘0’ mark on
the meter corresponds to a nominal +4dBu sine wave output.

The BAL control trims the relative levels of Left and Right Mix signals and this is
positioned before the Insert point so that the Mix signal can be balanced before
any compressor or other external processing unit. Note that the Mix signal is
always displayed on the VU Bargraph Meter above the fader.

The stereo MIX FADER sets the final level of the MIX outputs. This
should normally be set close to the ‘0’ mark if the input GAIN settings
have been correctly set, to give maximum travel on the fader for
smoothest control.

9

e

For further detail
see page 18

The TAPE RETURN jacks are an ideal place to connect the playback of
a tape machine, without using up any of the LINE inputs. This pot sets
the level of playback signal fed either to the MIX (when MIX is pressed)
or MONITOR, when MIX/2TK is pressed. The inputs accept signals
from either 100mV semi-professional equipment or +4dBu professional
machines.

The TAPE RETURN is also the best way of connecting a tape or CD
player to feed pre-show music to a P A rig, since this leaves all input
settings unaltered. It can also serve as the return from an Effects unit
to save using up Line Inputs.

Press this switch to route the TAPE RETURN signal direct to the mix
outputs. Adjust the input level with the TAPE RETURN LEVEL control.
The Tape Return signal will now be present at the Mix outputs, at a level
set by the Master Faders, and the meters will display this same signal.

DO NOT press this switch if recording via the Mix output to the same tape
machine or oscillation may occur.

Normally the Monitor and Phones outputs receive
either the Mix signal or the 2 Track Return signal,
depending on the position of the MIX/2TK switch.

STEREO LISTEN provides a further choice of
sources from Aux Sends 5-8, Groups 1-4 or
Stereo Returns PFL. The switches are
non-interlocking to allow several sources to be
monitored simultaneously. The PPM meters
monitor the selected signal.

Press this switch to route the TAPE RETURN
signal to the MONITOR and PHONES outputs.
Adjust the input level with the TAPE RETURN
LEVEL control. The PPM meters will now be
directly reading the level of the Tape Return.

This control sets the output level to the
MONITOR LEFT & RIGHT outputs. If
HEADPHONES are plugged into the
PHONES jack the Monitor outputs are
cut off, and the knob then sets the
headphone listening level. When the
PHONES are unplugged the Monitor
output is restored.

10

INITIAL SETTING UP

You will probably use your SPIRIT FOLIO 4 with a wide range of different types of sound source, and these will be
at varying signal levels. It is important to set the G AIN of the inputs corr ectly to give the best perfor mance.

Set up the individual mono input channels as follows:

•• Plug in the chosen source (usually the MIC input for mics and the LINE input for
anything else). Plug in phantom powered mics before switching the phantom power
on.

•• Set the Master and Group Faders fully down.

•• Provide the chosen source with a typical signal level and press and hold the P FL button

by the fader. The level of signal will be shown on the right-hand Bargraph PPM Meter
(the Left meter will be switched off by depressing the PFL button).

•• Adjust the input GAIN until the PPM meter is just reaching the amber LED (0dB) at a
typical maximum source level with a steady signal. If the source signal is rich in
high-level transients (e.g. drums) a rather higher meter r eading of +6/+9 will be needed
to achieve an equivalent average level. This leaves enough headroom to cope with
peaks in the signal without distortion.

•• Adjust each mono input channel in the same way.

•• If you find that you cannot set a reasonable level wit hin the r ange of the G AIN cont rol

when using a MIC input, try the LINE input instead.

The Stereo inputs do not have a GAIN control, since the typical source for these inputs will be external tape
machines or effects units which have a much m ore predictable signal level. Set the +4/-10 switch to +4 (released)
initially, and check the input level with the PFL switch as decribed above. If the level is too low, switch to the -10
input setting.

You will now have initial settings for each of the input sources and are ready to start building a mix.

•• Connect the mix or monitor output s to your power am plifiers and speakers and set th e
gain of the amplifiers to about 70%. Move the Master Faders gradually to the top,
listening carefully for any hint of feedback or overload. You may find that the input
gain settings will need to be edged back slightly as the mix is built up.

•• Listen carefully for the characteristic sound of ‘feedback’. If you cannot achieve a
satisfactory input level setting without feedback, adjust microphone and speaker
positions and try again.

Careful microphone placement and the choice of a suitable type of microphone is essential for s uccessful PA use.
The aim should be to place the microphone as close as possible to the source, to cut out unwanted surrounding
sounds. This allows a lower gain setting on the mixer and helps to avoid feedback. You will also find that a
well-placed microphone will not need any appreciable equalisation.

11

SPIRIT FOLIO 4

SETTING UP FOR MULTITRACK RECORDING

While the connections to the FOLIO 4 for PA work are quite straightforward, recording is rather more demanding
because the mixer is not only required to mix down input signals but also to provide a monitor mix for artists to
hear previously recorded tracks when overdubbing new parts.

A typical 4-track set-up is as follows:

•• Connect input sources and set gain as described above. Connect the Group outputs
to the tape inputs.

•• Route the channel signal via the Group outputs to the required tape input by setting
the PAN fully left or right. For example, panning fully left will route the signal from
Group 1 or 3 output only. This allows an individual source to be sent to an individual
tape track.

•• Connect the tape outputs to unused mixer Line Inputs. Use the faders on these
channels, routed to mix, to make your monitor mix. Connect a stereo amplifier and
speakers to the monitor outputs, or use headphones to listen to this mix.

•• Use the Aux 1 or Aux 2 (or both) send controls on either tape channels or source
channels to set up a mono mix for musicians headphones.

•• Connect a monitor amplifier for foldback headphones or a monitor speaker to the Aux
1 or Aux 2 output as appr opriate. Set the amplifier volume to a nor mal list ening level.

•• If a compressor is to be used, connect this to the appropriate group insert points.

•• Connect any effects required using one of the post-fade Aux sends, and return them

to the mixer on the Stereo Returns to allow the effect to be balanced with the original
source.

Recording a Live Performance

It is not appropriate to use the group outputs to record a live performance, since these will be most useful for
subgrouping parts of the PA mix. Inst ead, use the -10dBV 2-T rack Tape Sends, which are completely independent
of the mix fader level.

SPIRIT FOLIO 4

12

THE CONTROLS IN MORE DETAIL

MONO INPUT CHANNEL

MIC INPUT

The mic input socket at the rear of the mixer 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-c ost 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. Each mic input has a switch to turn on +48V PHANTOM POWER
providing 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 m ic f rom af fect ing the Line I nput gain. The input
level is set using the GAIN knob.

LINE INPUT

Balanced Mic Input - XLR

2. Hot(+ve)

3. Cold(-ve)

Balanced

1. Screen

Input

Unbalanced Mic Input - XLR

2. Hot(+ve)
Link 3

to 1

1. Screen

Accepts 3-pole ‘A’ gauge (TRS) jacks. Use this input for sour ces other than
mics, such as keyboards, drum machines, synths, tape machines or guitars.
The input is BALANCED for low noise and immunity from int erfer ence, 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 (shown by
illumination of the PEAK LED) 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’ for guidance on how to set the GAIN
correctly.

If the signal level is too high, clipping distortion
may occur.

Unbalanced

3-Pole Jack

Hot (+ve)

Cold (-ve)

Gnd/Screen

Tip

Ring

Clipped

Signal

Noise

Input

UnbalancedBalanced

Signal
Gnd/Screen
Gnd/Screen

Sleeve

100Hz HI-PASS FILTER

Pressing this switch enables a 12dB/octave Hi-Pass Filter
which reduces the level of bass frequencies only, and is a real
bonus on a compact mixer. Use this in live PA situations to
reduce stage rumble or ‘popping’ from microphones.

13

Signal

If the signal level is too low it may be masked
by the noise.

Noise

SPIRIT FOLIO 4

INSERT

The pre-EQ Insert is a break point in the channel signal path. It allows the signal
to be taken out of the mixer, through an external piece of equipment and then
back into the mixer to continue thr ough to the final output. The I nsert is a 3-pole

Signal Return
Gnd/Screen

‘A’ gauge jack socket, which is normally bypassed. When a jack is inserted, th e

Signal Send

signal path is broken at a point just af ter the Hi-Pass Filter, but before the EQ
section. The signal from the channel appears on the TIP of the plug and is
returned on the RING. The insert point allows limiters, compressors and other
signal processing units to be added as required to particular channels and,

Tip

Ring

Sleeve

because it is located pre-EQ, noise generated by the external equipment may be
reduced by a small amount of H.F. cut in the Equaliser.

EQUALISER

The Equaliser (EQ) allows precise manipulation of the sound,
particularly to improve the sound in live PA applications where the
original signal is often far from ideal due to poor acoustics or
restrictions on where to place microphones and where slight
boosting or cutting of particular voice frequencies can r eally make a
difference to clarity. The EQ allows enough control to improve, for
instance, bad recordings or the precision to gently enhance vocal
or live instrument tracks. Ther e are three sections , HF, MID and LF

dB

20.0

BOOST

LF SWEPT MID HF

15.0

10.0

5.0

0.0

-5.0

-10.0

-15.0

CUT

-20.0
20 1k 10k 20k

TYPICAL EQUALISER RESPONSE

100

Frequency/Hz

giving the sort of control usually only found on much larger mixers.
The EQ knobs can have a dramatic effect, so use them sparingly
and listen carefully as you change any settings so that you get to know how they affect the sound.

HF EQ

Turn to the right to boost high (treble) frequencies by up to 15dB at 12kHz, adding crispness to cymbals, vocals
and electronic instruments. Turn to the left to cut these frequencies by up t o 15dB, reducing hiss or other unwanted
high-frequency components in the signal, which can be em phasised by cert ain types of microphone. Set the kno b
in the centre-detented position when a flat response is required.

MID EQ

There are two knobs which work together to form a SWEPT MID EQ. The lower knob provides 15dB of boost and
cut, just like the HF EQ knob, but the frequenc y at which th is occurs can be set by the upper knob o ver a range of
250Hz to 6kHz. This allows some truly creative improvement of the signal in live situations, because this mid band
covers the range of most vocals. Listen carefully as you use these controls together to find how particular
characteristics of a vocal signal can be enhanced or reduced. Set the lower knob to the centre-detented position
when not required.

LF EQ

Turn to the right to boost low (bass) frequencies by up to 15dB at 60Hz, adding warmth to vocals or extra punch
to synths, guitars and drums. Turn to the left to cut low frequencies by up to 15dB for reducing hum, stage rumble
or to improve a mushy sound. Set the knob to the centre-detented position when not required.

EQ SWITCH

The EQ switch bypasses the Equalisation section when released and places it into the channel path when pressed.
It would typically be used for simple comparison of the equalised and unequalised signal.

AUXILIARY SENDS

SPIRIT FOLIO 4

14

These controls route the input channel signal to any one or more of eight Auxiliary busses. These combine the
sends from each channel, mixing them to separate outputs on the rear of the mixer. Since they are independent
of the main outputs they can provide additional sources for foldback, effects processors or extra loudspeaker ‘fills’.
The controls are specially chosen to give a particularly smooth control range at the lower end of the scale where
it is most needed - quite unique on a mixer of this type. Leave the knobs turned anticlockwise when not in use.

AUX SEND 1 & 2

These sends are always PRE-FADE, PRE EQ and are unaffected by the ON switch. They would typically be used
for Foldback or Monitor feeds, for which it is important that the send should be independent of the fader so that,
for instance, the mix to artists headphones is not affected by changes in fader level.

AUX SEND 3

This send can be pre-fade, pre-EQ and be used in the same way as Aux Sends 1 & 2 for Foldback or as a Monitor
feed, but for Effects it is more appropriate for the Aux Send to fade up and down with t he fader (POST-FADE) . A
Master Section AUX3 PRE switch allows you to switch all channel Aux 3 sends from pre- to post-fade across the
whole mixer as required. The send is unaffected by the position of the ON switch if the master section Aux 3 PRE
is pressed.

AUX SENDS 4-8

These are always POST-FADE and would normally be used to drive effects processing units which are fed back
into the mixer and which must fade out with the input channel.

Aux 4 is an individual mono send, while the 5/6 STE knob feeds the channel signal via the PAN control (see below)
as a stereo pair to either Aux outputs 5 & 6 or, with the 7-8 switch pressed, to Aux outputs 7 & 8.

PAN

This control sets the amount of the channel signal feeding t he Right and Left MIX or GRO UP outputs, a llowing you
to move the source smoothly across the stereo image. Rotation fully anticlockwise feeds the signal solely to the
Left mix bus, Group 1 or Group 3, while rotation clockwise sweeps the image to the right bus, Group 2 or Group

4.

ON SWITCH

The ON switch enables all post-fade outputs from the channel when pressed. Note that the Insert p oint is unaffected
by the ON switch.

OUTPUT ROUTING

The input channel signal is always routed to MIX or GROUPS as selected by the two ROUTING switches. The
upper switch selects MIX when released or GROUPS when pressed, while the lower switch chooses between
Groups 1-2 when released or Groups 3-4 when pressed.

PEAK INDICATOR

This LED indicator warns when an excessively high signal level is present in the channel. The signal is sampled
immediately after the EQ section and the LED will illuminate approximately 4dB before clipping. It will therefore
take into account the effect of any equipment connected to the Insert point.

PFL

When the latching PFL switch is pressed, the pre-fade signal is fed to the headphones or monitor outputs, replacing
the selected source (either Mix or Tape Return). The PFL/AFL LED on the Mas ter section i lluminates to warn that
the headphones, monitor outputs and right PPM meter are now responding to the PFL/AFL selection. This is a
useful way of listening to any one or more signals without interrupting the main mix, for adjusting signal quality or
simply to check that it is there! You would also us e the PFL switc h to set the input GAIN as explained under ‘Initial
Setting Up’.

FADER

15

SPIRIT FOLIO 4

STEREO INPUT CHANNELS 13-20

UnbalancedBalanced

STEREO INPUT L & R

These inputs accept 3-pole ‘A’ gauge (TRS) jacks. Use these inputs
for sources such as keyboards, drum machines, synths, tape
machines or as returns from processing units. The inputs are
BALANCED for low noise and immunity from interference, but you can
use UNBALANCED sources by wiring up the jacks as shown, although
you should then keep cable lengths as short as possible to minimise
interference pick-up.

Hot (+ve)

Cold (-ve)

Gnd/Screen

Tip

Ring

Signal
Gnd/Screen
Gnd/Screen

Sleeve

INPUT +4/-10

Most professional equipment uses input and output levels of +4dBu,
but semi-professional tape machines or hi-fi systems use a lower leve l
of -10dBV. This switch allows you to match the sources connected to the Stereo input jacks to either standard,
which is important to ensure the best possible sound quality. If you are not sure what input level is appropriate,
start with the switch UP to select +4dBu. If you are unable to achieve an adequate signal level, press the switch
in for -10dBV.

HF EQ

Turn to the right to boost high (treble) frequencies, adding crispness to percussion from drum machines, synths
and electronic instruments . Turn to the left to cut these frequencies, reducing hiss or excess ive brilliance. Set the
knob in the centre-detented position when not r equired. The control has a shelving response giving 15dB of boost
or cut at 12kHz.

LF EQ

Turn to the right to boost low (bass) frequencies, adding extra punch to synths, guitars and drums. Turn to the left
to reduce hum, boominess or improve a mushy sound. Set the knob to the centre-detented position when not
required. The control has a shelving response giving 15dB of boost or cut at 60Hz.

EQ Switch

The EQ switch disables the equaliser when re leased and activates it when press ed. It would typically be used for
simple comparison of the equalised and unequalised signal.

AUXILIARY SENDS

These controls route the input channel signal to any one or more of eight Auxiliary busses. These combine the
sends from each channel, mixing them to separate outputs on the rear of the mixer. Since they are independent
of the main outputs they can provide additional sources for foldback, echo units or extra loudspeaker ‘fills’. The
controls are specially chosen to give a particularly smooth control range at the lower end of the scale where it is
most needed - quite unique on a mixer of this type. Leave the knobs turned anticlockwise when not in use.

AUX SEND 1 & 2

These sends are always PRE-FADE, POST EQ and are not affected by the ON switch. They would typically be
used for Foldback or Monitor feeds, for which it is important that the send should be independent of the fader so
that, for instance, the mix to art ists headphones or monitor wedges is not affected by c hanges in fader level. They
are fed from a mono sum of the channel Left and Right signals.

AUX SEND 3

SPIRIT FOLIO 4

16

This send can be pre-fade and used in the same way as Aux Sends 1 & 2 for Foldback or as a Monitor feed, but
for Effects it is more appropriate for the Aux Send to fade up and down with the fader (POST-FADE). A Master
Section AUX3 PRE switch allows you to switch all channel Aux 3 sends from pre- to post-fade across the whole
mixer as required. The send is fed from a mono sum of the channel Left and Right signals.

AUX SENDS 4-8

These are always POST-FADE and would normally be used to drive effects processing units which are fed back
into the mixer and which must fade out with the input channel.

Aux 4 is derived from a mono sum of Left and Right, while the 5/6 STE knob feeds the c hannel signal via the BA L
control (see below) as a stereo pair to either Aux outputs 5 & 6 or, with the 7-8 switch pressed, to Aux outputs 7
& 8. This is particularly useful to feed the growing number of stereo effects units now available.

BALANCE

This control sets the amount of the channel signal feeding the Right and Left MIX outputs, allowing you to balance
the source in the stereo image. When t he cont rol is turned f ully right or left you feed only that side of the signal t o
the mix. Unity gain is provided by the control in the centre-detented position.

ON Switch

The ON switch enables all post-fade outputs from the channel when pressed.

PFL

When the latching PFL switch is pressed, the pre-fade signal is fed to the headphones or monitor outputs, replacing
the selected source (either Mix or Tape Return). The PFL/AFL LED on the Mas ter section i lluminates to warn that
the headphones, monitor outputs and right PPM meter are now responding to the PFL/AFL selection. This is a
useful way of listening to any one or more signals without interrupting the main mix, for adjusting signal quality or
simply to check that it is there! You would also use the PFL switch to check the input level as explained under
‘Initial Setting Up’.

FADER

MASTER SECTION - AUXILIARY MASTERS

AUX 3 PRE

The input channels provide both Pre- and P ost-Fade AUX 3 sends which may be selected desk-w ide on the Master
Section. Press the AUX 3 PRE switch to make all of the AUX 3 Sends on the channel strips PRE-FADE. This
means that they will all be unaffected by the position of the channel faders or the ON switches, making them ideal
for FOLDBACK or MONITORING. Since this button affects all the channels on the mixer, its importance is
highlighted by a mauve cap colour.

When the switch is released the AUX 3 Sends are all POST-FADE, and will fade up and down with the channel
faders. This is more suitable for effects sends which need to fade out with the associated source.

MASTER LEVEL

Each of the Auxiliary Send busses is provided with a rotary master level control. Aux 1-4 are individual controls,
while Aux 5/6 and Aux 7/8 are stereo pairs. A MONO switch is provided to turn Aux 7/8 int o summed mono outputs
if a greater number of mono sends is required. Note that in this instance the position of the channel PAN and BAL
controls may affect the Aux 7/8 output level.

AUX 1 -4 AFL (AFTER FADE LISTEN)

17

SPIRIT FOLIO 4

Just like the PFL switches on the channel s, you can monitor the AUX 1-4 outputs by pressing the latching AFL
switch. This routes the AUX output signal to the MONITOR or PHONES, replacing any existing signal (normally
the Monitor receives either MIX or the Tape Return, depending on the position of the MIX switch - see below). The
RIGHT PPM METER also switches from the se lected source to display the PFL/AFL signal and the PFL/AFL LED
lights to warn that a PFL or AFL switch is pressed. When you let go of the switch the Monitor returns to the previous
source.

MASTER SECTION - STEREO RETURNS

Two Stereo Return sections each comprise a pair of similar inputs suitable for -10dBV and +4dBu sources. The
inputs are unbalanced, and separate jacks are provided for the Left and Right source signals. A mono signal may
be plugged into the Left socket only for each pair to be fed equally to left and right busses.

Each section is provided with a routing switch to select between a pair of Groups (switch released) or MIX (switch
pressed). Stereo Returns A & B feed Groups 1 and 2, while Returns C & D feed Groups 3-4. PFL l istening i s
provided from a combination of all Stereo Ret urns through the ST EREO RTNS PFL switch on t he m onitor secti on
(see below).

MASTER SECTION - GROUPS

Mix Output - XLR

Four group outputs are available, arranged as pairs, which may be fed from th e
Channels or the Stereo Returns. Each Group output is ground
compensated/impedance balanced and is provided with a pre-f ade insert point.
The MIX switch routes the Groups as a stereo pair to Mix Left/Right, Groups 1
and 3 feeding Mix Left and Groups 2 and 4 feeding Mix Right. Each pair of
Groups may feed post-fade to two Aux busses as a stereo pair, with a choice of
Aux 5/6 or 7/8 depending on the position of the 7-8 switch. These controls will
be found particularly useful for sending to reverb units, side fill feeds, alternate
PA stacks or individual zones in clubs.

1. Screen

3. Ground
Sense(-ve)

2. Hot(signal)

MIX OUTPUT

The stereo MIX FADER sets the final level of the ground compensated MIX
outputs. This should normally be set close to the ‘0’ mark if the input GAIN
settings have been correctly set, to give maximum travel on the fader for
smoothest control. If, even with correct input settings, you find that you are working with the mix fader very low,
then turn your power amplifiers down so that you can bring the fader level back to normal.

The BAL control trims the relative levels of Left and Right Mix signals and this is positioned
so that the Mix signal can be balanced before any compressor or other external processing unit. Note that the Mix
signal is always displayed on the VU Bargraph Meter above the fader (see below).

Ground

Compensated

Output

before

the Insert point

Tape SendS

The pre-fade mix signal is provided on independent Tape Send jacks, which are an ideal source for recording a
performance and are suitable for a -10dBV tape input.

BARGRAPH METERS

Two types of Bargarph Meter are provided, to suit individual preferences and signal types, which provide visible
control of the signal at selected points in the mixer.

The three-colour VU Bargarphs display t he MIX signal at all times, and sam ple the signal after the Balance contr ol
and Insert point. The ‘0’ mark on the meter corresponds to a nominal +4dBu sine wave output.

SPIRIT FOLIO 4

18

The three colour PPM Bargraph Meters normally follow the Monitor selection to show the level of the Stereo MIX
outputs or 2-Track Tape Returns, giving you a constant warning of excessive peaks in the signal which might cause
overloading. Alternatively they may be switched to monitor a choice of Group or Auxiliary outputs, the Stereo
Returns or the Tape Returns. The fast attack of the meters means that a signal with high level transients (e.g. kick
drum) will tend to give a higher reading than a less dynamic signal (e.g. a synth) at the same level. You should
therefore aim for an average reading of +6/+9 if the mix contains a high proportion of high level transients and a
lower reading of around ‘0’ for steadier signals with the Master Faders at about the ‘0’ mark.

If the output level is too low and hardly registering at all on the meters, the level of background noise may become
significant. In this case check that input
levels and gain settings are correct (see the
section -- Initial Setting Up) . When any PFL
or AFL switch is pressed the left meter is
switched off and the Right meter displays

Signal Send
Signal Return
Gnd/Screen

Signal
Screen
Screen

Signal (+ve)
Ground Sense (-ve)
Screen

the PFL/AFL signal.

Tip

OSCILLATOR

Ring

Sleeve

A built-in 1kHz OSCILLATOR provides a
test tone for system tests or aligning Tape
Machines. Press the switch to turn ON the

Inserts

Tape Returns Outputs

oscillator and feed a 1kHz tone to the MIX
and GROUP outputs at a fixed level. DON’T

DO THIS DURING A LIVE
PERFORMANCE, OR WITH THE AMPLIFIERS TURNED UP HIGH - a sudden, very loud burst of tone will not

do your ears or your loudspeakers any good! Since this button must therefore only be used with caution, its
importance is highlighted by a mauve cap colour.

2 TRACK RETURN LEVEL

The TAPE RETURN jacks are an ideal place to connect the playback of a tape machine, without using up any of
the LINE inputs. This pot sets the level of playback s ignal fed either to the MIX (when M IX
is pressed) or MONITOR, when MIX/2TK is pressed. The inputs accept signals from
100mV Hi-Fi through -10dBV semi-professional equipment up to +4dBu professional
machines.

Left Signal
Right Signal
Ground

The TAPE RETURN is also the best way of connecting a tape or CD player to feed pre-show
music to a PA rig, since this leaves all input settings unaltered. It can also serve as the
return from an Effects unit to save using up Line Inputs.

MIX

Press this switch to route the TAPE RETURN signal direct to the mix outputs. Adjust the
input level with the TAPE RETURN LEVEL control. The Tape Return signal will now be
present at the Mix outputs, at a level set by the Master Faders, and the meters will display
this same signal.

Headphones

MIX/2TK

Press this switch to route the TAPE RETURN signal to the MONITOR and PHONES outputs. Adjust the input
level with the TAPE RETURN LEVEL c ontrol. An setting of 3
a setting of 6 corresponds to -10dBV. The PPM meters will now be directly reading the level of the T ape Return,
providing a useful way of matching the level of sources for recording.

1

⁄2 corresponds to an input level of about + 4dBu a nd

NOTE: If both MIX/2TK and MIX are pressed, the mix outputs will be carrying the Tape Return signal under the
control of the Master Faders and the VU meters will show the true output level, while the PPM meters will be
displaying the full Tape Return signal.

STEREO LISTEN

19

SPIRIT FOLIO 4

APPLICATIONS

STEREO PUBLIC ADDRESS

In this basic PA Set-up, various sources are connected to the inputs, microphones to Mic inputs and keyboards
etc. to Line inputs. Note that some guitars will not produc e suff icient level for a direct connect ion, and will require
a Direct Injection (DI) box connected via t he microphone input. The output is tak en from Mix L & R and connect ed
to the speakers via a suitable power amplifier. A compressor/limit er is included in the Mix Insert s, and a cassette
machine connects to the Tape Return to provide interval music. The Groups may be used to combine several
inputs under the control of single fader before mixing to the L & R outputs. The cassette (or 2-T rack tape machine)
may be used to record the performance via the Tape Sends if required.

SPIRIT FOLIO 4

20

PUBLIC ADDRESS - STEREO + SIDE FILL OR CENTRE FEED

In this second example an additional side fill or centre speaker cluster is driven from Aux 7 & 8, Aux 4 or Aux 3
switched to Post-fade, with individual rotary fader contr ol. Aux 7 & 8 would be ideal, since a Group can also feed
these Aux sends if required. The individual channel Aux Sends allow a separate stereo mix to be created, or the
MONO button on the Aux Master section may be used to switch the mix to mono if required. This configuration
would also be appropriate to drive separate zones in a Club application.

21

SPIRIT FOLIO 4

STEREO RECORDING

The console may be used for 2-Track or basic multitrack recording, live or in the studio. The set up is similar to
the previous examples, but with the Mix L/R Output feeding a 2-Track Tape Machine. T he tape outputs are brought
back to the console for monitoring via the 2-Track Tape Returns. Aux 1, 2 or 3 (globally switched pre-fade) may
used to provide artists foldback on headphones, and Aux 5 and 6 feed a reverb unit which is returned to the console
on Stereo Return A and B.

SPIRIT FOLIO 4

22

4-Track Recording

The console may also be used for 4-Track recording. The set up is similar to the previous example, but with a
4-track recorder fed from the Group Outputs and brought back for monitoring via 4 line inputs. In this case a
compressor/limiter is shown applied to one of the mic channels via the insert.

23

SPIRIT FOLIO 4

GloSSARY

o

g

AFL (After Fade Listen) a function that allows the ope rator to monitor the post- fade signa l in a channel indep ende ntly of the

main mix.
Balance the relative levels of the left and right channels of a stereo signal.
Balanced a method of aud io conne ction which ‘balanc es’ the signal bet wee n two wires and a screen which carries

no signal. Any interferen ce is picked up equally by the two wires, but out of phase result ing i n

cancellation of the inter fere nce sign al.
Clipping the onset of severe distortion in t he signa l path, usually caus ed by the pe ak signal voltag e being limit ed

by the circuit’s power supply vo ltag e.
dB (decibel ) a ratio of two voltages or signal levels, expressed by the equation dB=20L og

suffix ’u’ denotes the rat io is relativ e to 0.775V RM S and‘V’ expr esses th e ratio relative to 1V RMS.
DI (direct injection) the practice of connect ing an electric mu sical instrum ent direct ly to the input of the

mixing console, rather than t o an amplifier and loudspea ker which is covered by a micropho ne feeding

the console.
Effects the use of devices to alter or process the sound to add special effect s e.g. reverb , normally as a mix of

the original (‘dry ’) soun d and the t reat ed ver sion.

Equaliser a device that allows the boosting or cutting of selected b a nds of f req uenc ies in the signal pat h.
Feedback the ‘howling’ sound caused by bringing a micro phon e too close to a loudspeake r driven f rom

its amplified signal.
Foldback a feed sent back to the artist es via loudspe aker s or headp hone s to enable them to mo nito r the

sounds they are producing.
FOLIO 4 the next best low cost quality mixer since FOLIO.
Frequency respo nse the variation in gain of a device with frequency .
Ground compensa tion a technique used on unbalance d output s to can cel out the effe ct of ground loops ca used by

connections

to external equipment.

Headroom the available signal range abo ve the nominal level bef ore clipping oc curs.
High Pass Filter a filter that rejects low frequencies.
Line le ve l si g n al s at a nominal level of -10 to +6dBu, usually coming fro m a low impedance sou rce.
Oscillato r a built-i n tone gene rator for test and li ne- up purpos es.

Peaking an equaliser response curve affect ing only a band of freque ncies i.e. based on a bandpass response .
PFL (pre-fade li ste n) a function that allows the operator to monitor the pre-fade signal in a chann el indepen dent ly of the

main mix.
Phantom Power the +48V d.c. voltage applied equally to the two signal pins of a balanced mic input to provide

powering for condenser micr ophones .

after

Post-Fade the point in the signal path

Processor a device which affects the whole of the signal passing through it, e.g. gate, comp ressor or equaliser
Rolloff a fall in gain at the extremes of the frequency response.
Shelving an equaliser response affec ting all frequenc ies above or below the break frequency

i.e. a highpass or lowpass derived response.
Signal to Noise Ratio a expression of the differ enc e in level between t he au dio signal and backgrou nd sys te m noise.
Spill acoustic interference from other sources.

Sweep EQ an Equ al iser se ction ( e.g. MID EQ ) which o p era tes at a variabl e rathe r than fi xed fr eque ncy givi n

increased flexibility to the user.

Talkback the operator speaking t o the artist es or to tape via the auxiliary or group outp uts.
Tape Return a line level input provided sp ecif ic al ly to receive the playbac k out put of a tape machine
Tape Send an independ ent pre-fade output of the Mix L & R signals to feed a 2-track tape or casset t e machine
Transient a mom entar y rise in the signa l level.
TRS Jacks a 3-pole jack with Tip, Ring and Sleeve connections
Unbalanced a method of audio connection which uses a single signal wire and the cable screen as the signal return.

This method does not provide the noise imm un ity of a

the chann el or master fader and ther efo re affe cted by fa der positi

balanced input

(see above).

SPIRIT FOLIO 4

(V1/V2). Addin g the

10

24

Technical Specifications

Noise

Mix Noise (all chann els rou ted, faders do wn) -82dBu
Residual Mix No ise (Mi x fader do wn) -98dBu
Group No ise (all ch annels ro uted, f aders down ) - 82dBu
Residual Gro up N oi se -94dBu
Auxiliary N oi se (Inpu ts down , Masters at m ax.) A u x 1-4 - 82dBu

E.I.N. (150Ωsourc e, max. mic gain) -129dBu

Total Harmonic Distortion

Mic Input to Mix Output

Line Input to Mix (at unity gain, +14dBu output) <0.002%
Stereo Input to Mix (at unity gain, +14dBu output) <0.0015%

Crosstalk

Input Fader cut off -100dB
Channel ON switch isolation -110dB

(Measured 20Hz - 20kHz RMS)

Aux 5-8 - 80dBu

(inc. Noise @ 1kHz)

(Input -30dBu, Input & Mix Fader unity, Output +14dBu) <0.007%

(@ 1kHz, typical)

Routing switch isolation -85dB
Adjacent Channel (Mic gain at max., 150Ωtermination) >-95dB
Odd to Even Group isolation via PAN control -70dB
Auxiliary Send cut off -90dB
Stereo Return (A, B, C, D) control cut off -88dB
2-Track Return cut off -90dB
2-Track to Mix isolation -100dB

Frequency Response

Mic Input (mid gain) to Mix, via Group (longest path) -1dB, 20Hz - 30kHz
Mono Input EQ flatness +/- 0.5dB, 20Hz - 20kHz
Stereo Input flatness +/- 0.5dB, 20Hz - 20kHz

Input & Output Levels

Maximum Mic Input +16dBu
Maximum Line Input +28dBu
Maximum Stereo Input +26dB
Maximum Output (any output) +22dBu into bridging load
Maximum Mic Gain (via Group) 68dB
2-Track Return sensitivity -18dBu (100mV Hi-Fi level)
Stereo Return (A, B, C, D) sensitivity -11dBV (275mV)

25

SPIRIT FOLIO 4

Specifications (cont)

INPUT & OUTPUT IMPEDANCES

Mic Inputs 2k
Line Inputs 10k
Outputs 75

Ω

Ω

Ω

CMRR

At max. Mic Gain, 1kHz > 80dB

Weight

Console 12.7Kg
Power Transformer 1.0Kg

DIMENSIONS

Dimensions are in millimetres and inches (in brackets)

Power Transformer 10.2cm x 7.0 cm
Console see diagram below:

470.00

(18.50")

777.00 (30.59")

410.00

(16.14")

124.00
(4.88")

119.37
(4.70")

17.00
(0.67")

SPIRIT FOLIO 4

26

SYSTEM
BLOCK DIAGRAM

MASTER SECTION

➚

➚

27

➚
➚

MONO INPUT CHANNEL

▲

▲

3

2

1

STEREO INPUT CHANNEL

STEREO RETURNS

SPIRIT FOLIO 4