Vitus Audio SIA-025 User manual

SIA-025
Owner’s Manual

2
SIA-025 | Version 1
on a personal note
Certificate . . . . . . . . . . . . .4
from the creator
Foreword . . . . . . . . . . . . . . 5
introduction
About this manual . . . . . . . . . 6
Introduction to
the Signature Series . . . . . . . . 6
1. getting started
Unpacking the box . . . . . . . . . 8
What’s in the box. . . . . . . . . . 8
Device overview . . . . . . . . . .9
The topology of
the volume control . . . . . . . . 10
2. connecting
Turning the SIA-025 on and off. . 11
SIA-025 rear panel . . . . . . . . 12
Connecting the SIA-025 . . . . . 12
3. operation
Operation modes . . . . . . . . 14
Functions – left front panel . . . 16
Functions – right front panel . . 17
SIA-025 The menu structure . . . 18
SIA-025 The elements
in the menu. . . . . . . . . . . . 20
SIA-025 The menu structure . . . 21
4. operation & service
Safety notice . . . . . . . . . . . 22
Mains supply voltage . . . . . . 22
Maintenance . . . . . . . . . . . 22
Mains fuse . . . . . . . . . . . . 23
Replacing a blown fuse . . . . . 24

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SIA-025 | Version 1
table of contents
5. warranty
Warranty . . . . . . . . . . . . .26
6. specifications
SIA-025 Specifications . . . . . . 29
7. examples operation
Example 1 . . . . . . . . . . . .30
Example 2 . . . . . . . . . . . .31
Example 3. . . . . . . . . . . . . 32
Example 4 . . . . . . . . . . . .33
Example 5 . . . . . . . . . . . .34
Example 6 . . . . . . . . . . . .35
Example 7. . . . . . . . . . . . . 36
Example 8 . . . . . . . . . . . .37
Example 9 . . . . . . . . . . . .38
Example 10 . . . . . . . . . . . . 39
Example 11 . . . . . . . . . . . . 40
7. examples
connecting devices
Connecting devices . . . . . . . 41
Connecting devices 1 . . . . . . 42
Connecting devices 2 . . . . . .43
Connecting devices 3 . . . . . .44
8. RC-010
system remote
RC-010 System Remote . . . . .45
8. RC-010
getting started
What’s included . . . . . . . . .46
RC-010 System Remote
Device overview . . . . . . . . .47
8. RC-010 operation
RC-010 System Remote
operation modes . . . . . . . . . 48
The menu structure . . . . . . .53
RC-010 Discription of
the elements in the menu. 54
RC-010 The menu structure . . . 55
8. RC-010 examples
Example 1. . . . . . . . . . . . . 56
Example 2. . . . . . . . . . . . . 57
Example 2.1. . . . . . . . . . . . 57
Example 2.2. . . . . . . . . . . . 58
Example 2.3 . . . . . . . . . . .59
Example 3. . . . . . . . . . . . . 60
Example 4. . . . . . . . . . . . . 61
Example 5. . . . . . . . . . . . . 62
Example 6. . . . . . . . . . . . . 63
Example 7. . . . . . . . . . . . . 64
8. RC-010 specifications
Specifications . . . . . . . . . . . 65
8. RC-010 controls
The functions of the buttons . . 66
9. pictures SIA-025
SIA-025 Inside view. . . . . . . . 68
SIA-025 Front . . . . . . . . . . . 69
9. pictures RC-010
RC-010 Picture . . . . . . . . . . 70

4
SIA-025 | Version 1
on a personal note
Certificate
Model: SIA-025
Product ID/Serial
__________________________________
Product Build Date
__________________________________
Signed
__________________________________
All products details, specifications and
measurements are recorded for your SIA-025
and kept by Vitus Audio.

5
SIA-025 | Version 1
from the creator
Foreword
First of all, thank you for
choosing the Vitus Audio
SIA-025 integrated amplifier,
we are sure you will enjoy it
for many years to come. When
purchasing a Vitus Audio
product, you are guaranteed a
musical performance,
which exceeds the current
musical standards. Vitus
Audio is dedicated to musical
performance rather than
technical details and high
performance measures.
We believe that many
manufactures are blinded by
the current available theory,
instead of looking for new
answers.
At Vitus Audio everything
works until proven not to.
This way we always try to
push the limits and explore
the unexplored. As a result
of this, many of the solutions
we use today are considered
to be “impossible to ever
get working”, however they
have convinced many people
and reviewers world wide
of the opposite. Before any
of our new topologies are
implemented in our products,
they are carefully reviewed by
our dedicated listening panel.
This way we can guarantee
the correct level of musically
performance and robustness.
Generally we’re after super
neutral, super detailed and
super dynamic reproduction
without “loosing” the nerve
in the music which often is
a drawback of many high
end amplifiers. Our real
strongholds are complete
silence, unbelievable depth
and width in the soundstage
resulting in a far more open
sound with higher resolution
-you could say, closer to the
artist. As a result of the above,
our amps do not “focus” on
any specific frequencies - i.e.
no extension of top or bass,
which of course results in high
clarity of the midrange since
it’s “naturally present”!
Hans Ole Vitus

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SIA-025 | Version 1
introduction
About this manual
This is your SIA-025 owner’s
manual. The following pages
will describe, as clearly as
possible, how to get your SIA-
025 operating fast and simple.
Although some operations are
self-explanatory, we strongly
suggest you read this manual
to avoid any damage to the
unit. The manual is designed
to be helpful. If there are
points you feel we could cover
better, or that we have missed
out – please tell us.
Important
information is
presented like
this. Ignoring this
information may cause
damage to you or the
unit. Damage caused
to the unit by ignoring
this information might
invalidate the warranty.
The Vitus Audio Signature
Series is a true high-end series
of products, which build on
our true dedication to neutral
music reproduction. Every
detail is carefully thought
through, and all choices made
during development, where
based purely on listening, and
not measuring. Only the best
available materials are used to
ensure an overall quality which
will last for many years, when
treated right.

Introduction to the
Signature Series

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SIA-025 | Version 1
introduction
This amplifier is
VERY heavy –
make sure to be
at least two people to
unpack the unit. You
might damage both
your back and the
amplifier if extra care
is not applied. Vitus
Audio A/S cannot
be held responsible
for any damage that
is a consequence of
uncareful handling of
the unit.


Unpacking the box
After you have opened the
top, it is possible to remove
the top protective foam which
gives you direct access to the
amplifier. In the top you will
find the remote, the power
cord and brochures. Now
remove the side protective
foam, this will make it easier
to grab hold of the SIA-025.
Two people carefully lift the
amplifier out of the box, and
put it directly onto the floor.
Store the empty box and the
protective foam for later use.
What’s in the box
SIA-025
RC-010 System Remote
Remote Charger
Power Cable
USB with Manual & Brochure
Foam top 1
Foam top 2
Foam Sides 6 pieces
Foam bottom
Box
Figure 1 Box exploded view
Foam top 1
Foam bottom
Box
Foam top 2
Foam Sides
6 pieces
SIA-025
USB with
Manual &
Brochure
Power Cable
Remote Charger
RC-010
8
SIA-025 | Version 1
1. getting started

Device overview
Figure 2 Device overview
9
SIA-025 | Version 1
1. getting started
1. getting started
The body of the SIA-025 is
constructed of anodized
aluminium.
Material: anodized aluminium.
Dimensions (H x W x D):
130 x 435 x 435
Weight: 42 kg
135 mm 435 mm
435 mm
35 mm
20 mm

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SIA-025 | Version 1
1. getting started
The topology of the volume
control used in the SIA-025 is
very different compared to the
“standard”. The SIA-025 uses a
series of fixed resistor networks
to control the volume. Relays
are used to switch between the
resistor networks. Across all
volume steps, a fixed resistor
is in series with the signal
path. This gives the best per-
formance possible. When you
change volume, a different
number of shunt resistors are
used.
To prevent pop in the output,
we have chosen to first add
the new shunt resistors, and
then wait a short time, before
removing the unused shunt
resistors at the new volume
step. This will give a minor fall
in volume before settling at
the new volume step. It takes
only very little time to get
used to this type of operation
of the volume, and it will give
you superior sound quality
over the traditional digital and
analogue potentiometers.
The topology of the
volume control

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SIA-025 | Version 1
2. connecting
Turning the SIA-025 on and off.
Always turn on the products
beginning from the source:
Source apre-amplifier apower amplifier.
Always turn off your products in
reverse order:
Power amplifier apre-amplifier aSource.
Not following this procedure,
may cause damage to any of
your products/speakers.
Damage caused to any of your
products/speakers by not following
this procedure will invalidate the warranty.

2. connecting

SIA-025 rear panel
Outputs
Speaker left
Speaker right
Preout. XLR
Inputs.
Input 1,2,3. XLR
Input 4,5. RCA
Power
Figure 3 Plugs
Speaker out
Speaker out
XLR out
RCA
Power
XLR in
12
SIA-025 | Version 1
2. connecting
Connecting the SIA-
025
Place the SIA-025 on its shelf.
Connect all the sources to the
inputs of the SIA-025, (labelled
INPUT 1 to 5 on the rear
panel.)
Connect the Speaker output of
the SIA-025. Carefully connect
the mains to the amplifier,
after you have connected both
inputs and outputs.
This is a true balanced
amplifier, DO NOT
connect the ”-“output
(Figure 3) to any ground
source, including chassis or
signal ground, this will damage
the amplifier.
The pre-out connectors can
be connected to a power
amplifier for biamping or an
active sub.

Figure 3 ”-“output

Input 4Input 5
Input 2 Input 3
Output
Input 1
MAINS
Serienummer
her
Signature Series
SIA-025:
Integrated Amplier
Input 4Input 5
Input 2 Input 3
Output
Input 1
NEUTRIK
PUSH
NEUTRIK
PUSH
NEUTRIK
PUSH
NEUTRIK
PUSH
NEUTRIK
PUSH
NEUTRIK
PUSH
Figure 4 SIA-025 Rear panel.
Speaker out
XLR out
RCA
Fuse
Power XLR in
13
SIA-025 | Version 1
2. connecting
2. connecting

Figure 5 SIA-025 Front panel.
14
SIA-025 | Version 1
3. operation
Operation modes

15
SIA-025 | Version 1
3. operation
The SIA-025 has 3
operation modes
1. Normal mode.
This is the mode you use when
listening to music.
2. Menu mode
In this mode you can alter the
settings of the SIA-025.
3. Standby mode.
In this mode the controls of
the SIA-025 are deactivated.
3 Operation modes
3. operation

Figure 6 SIA-025 Left front panel.
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SIA-025 | Version 1
3. operation
Normal mode
In normal mode there are
3 basic functions/buttons
available on the left front.
1. INPUT Selects between
the 5 inputs.
2. MENU Switches to
“Menu mode”.
3. STANDBY Switches in and
out of
“Standby Mode”
Menu mode
You enter menu mode, by
pushing the ”MENU” button
once in Normal mode. In the
Menu mode there are 3 basic
functions/buttons:
1. Scroll forward in the
menu.
2. MENU/ Enter & Exit
SELECT submenus and
selectsettings.
3. Scroll backward in the
menu.
Functions – left front panel

Figure 7 SIA-025 Right front panel.
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SIA-025 | Version 1
3. operation
Normal mode
In normal mode there are
3 basic functions/buttons
available on the right front:
1.  Turns volume UP.
2. MUTE Mutes the output.
3.  Turns volume DOWN.
Menu mode
In the text-menu it is possible
to change the name of the
input. This is done by using
the following buttons from the
right front:
1.  Change selected
character.
2. MUTE Go to the next
character
in the display.
3. Change selected
character.
Functions – right front panel
3. operation

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SIA-025 | Version 1
SIA-025 The menu
structure
You can modify the settings
of the SIA-025. You do this by
entering the menu. On page
21 you can find a graphical
reproduction of the menu.
The sub-menus are indicated
with a colour. CLASS, INPUTS,
RESET, and V.INIT.
On page 20 you can find a
discription of the elements in
the menu. In the examples (
chapter 7) you can find various
examples of how to change
the settings of the SIA-025.
CLASS
The SIA-025 can operate as a
Class A or Class AB amplifier.
Input settings
The SIA-025 comes with
5 inputs. The settings for
each individual input can
be adjusted in the menu.
The input selection is saved
automatically every 10 minutes.
Each time you initialize the
SIA-025, the last saved setting
is restored. You can manually
save a setting by pressing the
MENU button down 2-3 sec.
When “SAVE” is shown in the
display, the setting has been
saved.
Input name settings
As a standard, the inputs are
named input 1, input 2, etc. In
the text-menu you can find a
list of predefined input names.
If the name of your device is
not in the list, you can choose
to make your own device
name.
(Examples 6 and 7
on page 35 and 36)
Input gain settings
Offset gain setting / Sensitivity
setting. Different sources often
have different output voltages.
This has a direct influence
on the typical volume level
that is needed for a specific
sound level, hence changing
between sources can result in
high sound level differences.
To accommodate easy
operation, we have included
a gain (or as some prefer to
call it – sensitivity setting) in
our amplifiers – it simply sets
the volume starting point at a
specific volume – to match the
source. The offset-value can be
set from - 12 dB to +12 dB.
(Examples 4 and 5 on pages 33
and 34)
3. operation

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SIA-025 | Version 1
3. operation
Volume settings
The SIA-025 starts up in
the same volume step on
initialization. You can select in
which volume step, the SIA-025
should initialize. You can set
the initial volume step in the
menu, to a step between -99
dB and +11 dB.
You can also set the initial
volume-step to “REMEMBER”.
When you set the SIA-025
to “REMEMBER”, then it
remembers the volume step
from when it was put to
standby. Next time the SIA-025
leaves standby, it will start in
this volume step.
(Examples 9 and 10
pages 38 and 39)
Input sensitivity
Devices can have differences
in output level. You can adjust
the sensitivity of each input
between ≤ 2 Vrms, ≤ 4 Vrms
and ≤ 8 Vrms. to minimize
these differences. To prevent
clipping of the input. The
sensitivity level needs to be
higher then the input level.
Disabling inputs
If you only use some of the
inputs, it is possible to disable
the inputs that are
not used. Using the “Input”
button, the system skips the
disabled inputs, and jumps to
the next input.
(Example 2 page 31)
Reset
Restore the settings of the SIA-
025 to its default settings.
(Example 8 page 37)
3. operation

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SIA-025 | Version 1
3. operation
SETUP
Change the settings of the SIA-025.
CLASS
Select if the SIA-025 should
operate as a Class A or Class
AB amplifier.
INPUTS
Change settings for each input.
INPUT X
Change the settings of input X.
USED
Select whether input X has to be
USED or not NOT USED.When
you select NOT USED input X will
not be shown in the list of inputs.
FIXED
Lock and unlock the volume by
switching between FIX ON/FIX OFF.
SET FIX
Set the volume of input X to a
fixed dB step. (Input X is now
locked to a dB step and can not
be adjusted with the volume
control)
ADJUST
Adjust the fixed dB step to any
step between -99 and +11 dB.
This function is only available
when FIX ON is selected.
OFFSET
Select an offset- gain, between
-12 and 12 dB, for input X. This
function is only available when FIX
OFF is selected
SENS
Change the sensitivity of the
input. Select between ≤ 2 Vrms,
≤ 4 Vrms and ≤ 8 Vrms. The
sensitivity level needs to be higher
then the input level. To prevent
clipping of the input
TEXT
Choose a name for input X.
DATA
Shows information about this
SIA-025.
RESET
Restore the settings of the SIA-025
to its default settings.
V.INIT
Change the initial dB step of the
volume in the SIA-025 to any step
between -99 dB and +11 dB
VOL.STEP
The SIA-025 has a standard
volume step of -40 dB. You can
set the volume step to a step,
between -99.0 dB to +11dB.
This step will be the new volume
step. Even when after the power
cord has been disconnected the
SIA-025 still starts up in the new
volume step.
REMEMBER
Set the SIA-025 to remember
the current volume step. The
SIA-025 will start up in this volume
step when it leaves standby.
This volume step however is not
remembered when the power
cord is removed. Then the SIA-025
will initiate in the volume step as it
is defined in the V.INIT sub-menu.
BRIGHT
Change the brightness of the
display any step between 0 and 3.
SIA-025 The elements
in the menu.