Soulution 755 User manual

Series 7
soulution
nature of sound
Phono-preamplifier 755
User manual

Phono-Preamplifier 755
User manual
page 1
Dear client
We are proud that you decided to go for a soulution product. You have acquired a
phono-preamplifier with outstanding sonic performance which you will enjoy for
many years.
We understand your eagerness to get started but even though please study this
manual step by step before you integrate the phono-preamplifier 755 in your High
Fidelity system. This manual contains also useful tips for the optimisation of your
overall HiFi-system.
If there are any questions regarding the start-up or operation of your phono-
preamplifier 755 please do not hesitate to contact your dealer.
Enjoy!
Your soulution team

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CE-Declaration of Conformity
Spemot AG declares that this product is in conformance with the following direc-
tives and standards:
Low Voltage Directive 2006/95/EG (EN/IEC 60065:2002)
Electromagnetic Compatibility 2004/108/EG (EN 55013:2001, EN 55020:2002,
EN 61000-3-2:2006, EN61000-3-3:1995)
FCC-Notice
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are de-
signed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may cause harm-
ful interference to radio communications. However there is no guarantee that inter-
ference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encour-
aged to try to correct the interference by one or more of the following measures:
adjust or relocate the receiving antenna
increase the separation between the equipment and the receiver
connect the equipment into a mains outlet on a circuit different from that to
which the receiver is connected
consult the dealer or an experienced radio/TV technician for help
Disposal
According to the Directive 2002/96/EG of the European Parliament used
consumer-electro technical appliances have to be disposed separately
and have to be indicated with the following symbol.
In the case of disposal of this component please do so in conformity with legal and
environmental regulations.

Phono-Preamplifier 755
User manual
page 3
Table of contents
1Quick start.......................................................................................... 3
2Highlights........................................................................................... 4
3Safety advice: ................................................................................. 6
4Scope of delivery................................................................................. 7
5Rear panel .......................................................................................... 7
6Front panel ......................................................................................... 9
7Program-Mode .................................................................................. 11
8Remote control ................................................................................. 14
9Safety functions ................................................................................ 15
10 Warranty........................................................................................... 15
11 Trouble shooting ............................................................................... 16
12 Service ............................................................................................. 16
13 Specifications ................................................................................... 17
14 Dimensions....................................................................................... 18
1Quick start
Unpacking
Unpack the phono-preamplifier 755
Store the packing for future transportations
Treat the surfaces with care
Positioning
Position the phono-preamplifier 755 on a stable base.
Cooling air must be able to escape unrestricted.
Cabling
Disconnect all components of your system from the mains
Connect the phono-preamplifier 755 with your (pre)amplifier
Connect the 755 with your turntables
Connect all your components with the mains
While manipulating with cables the 755 has to remain
disconnected from the mains.
Settings
Default values for all functions are programmed
No additional settings are required.
Switch on
Switch-on the phono-preamplifier 755
Select a moderate volume level (if Volume-Mode is ON)
Switch-on your your (pre)amplifier
Check the cabling before you switch-on

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2Highlights
2.1 Layout
The phono-preamplifier 755 is an unbalanced dual mono circuit design. Left and
right audio channels (incl. phono mc stage) each have identical circuit boards. Re-
sulting in a channel separation of >105 dB, prerequisite for a three dimensional
spatial reproduction.
The audio section is physically separated from the power supply units and the digi-
tal circuits. For minimal interference the different sections are shielded against
each other.
2.2 Phono-stage (optional)
The 755 phono-preamplifier provides a gain of +72 dB or +78dB (at 1 kHz) for the
MC-inputs and +60 dB or +66dB (at 1 kHz) for the MM-input. The gain can be ad-
justed individually per input. The phono amplifier works with an internal bandwidth
of 1 MHz (-3 dB). This guarantees the most accurate reproduction of the RIAA -
equalisation curve.
The impedance can be adjusted per input with relais-switched high precision metal
foil resistors. This allows perfect matching to your cartridges. For the MC-inputs the
impedance can be adjusted from 10to 1‘000, for the MM-input provides ad-
justment from 47to 47kand 0pF to 750pF. The impedance can be adjusted
from the listening position through the remote-control.
2.3 Volume control
The 755s high precision volume control may be activated or deactivated depending
on the individual setup of your high-end system. In a “puristic”phono setup the
755 phono preamplifier can drive the power amplifiers directly.
Relays switched high precision metal foil resistors form an 80 steps (1 dB) volume
control. Each channel has its own volume control resistor network. The volume con-
trol allows also adjusting the balance. Depending on the balance setting the volume
of the left or right channel is decreased.
In order to avoid unpleasant click-noise and harmful voltage peaks while changing
the volume the phono-preamplifier 755 disposes over an additional volume control

Phono-Preamplifier 755
User manual
page 5
path only active while actually changing the volume. This parallel volume control is
realised with a Programmable Gain Amplifier (PGA) which is able to adjust the vol-
ume without any noise. As soon as the new volume level is set the signal path is
switched to the high end resistor network.
2.4 Output stage
The output stage is optimised for velocity, precision and impulse current rating.
Thanks to its low output impedance of 2and Class-A operation (40mA idle cur-
rent) the output stage is stable on every load (also long cables are driven without
problems).
The theoretical maximal current rating of 3 amperes is limited to 1 ampere. This is
achieved with a protection circuit outside the signal path.
Due to the bandwidth of 1 MHz (-3 dB) - internally the output stage works up until
frequencies of 40 MHz - all details of the music reproduced naturally. The spatial
reproduction gets really three dimensional and holographic (optimal recording pre-
requisite). The power of the output stage ensures that all these details are truly
transmitted to your amplifier. (Cable losses are minimised).
2.5 Power supply
The phono-preamplifier 755 has two separate power supply units, one for the sup-
ply of the audio section, another for the supply of the digital circuits. The stringent
separation of the power supply units is amended with a multi stage filter network.
Interference between digital and analogue circuits is thus minimised.
The supply voltages for the audio section are multi stabilised by fast and precise
regulation stages. More than 500’000 microFarad of capacitance ensures optimal
impulse response of the powers supply.

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3Safety advice:
User manual
Follow the safety advices
Keep this user manual.
Mains supply
Exclusively use 3 phase power cords with ground conductor.
Unplug the 755 from the mains in the following cases:
before you manipulate with cables
before cleaning
during thunder storms
before you leave for longer periods
Cabling
While manipulating with cables the 755 has to remain discon-
nected from the mains. Wrong cabling may cause damages to
your 755, amplifier and loudspeakers. Excessive volumes due to
inappropriate handling may cause hearing damages.
Transport
Use only with the cart, stand, tripod, bracket or table specified by
the manufacturer or sold with the apparatus. When a cart is used,
use caution when moving cart/apparatus combination to avoid in-
jury or tip over.
Packing
In order to omit condensation of water inside the 755, let it warm
up within the packing.
Please keep the original packing for future transports.
Operation
Never run your preamplifier 755
with opened housing
with closed cooling-slots
with high ambient temperatures (>40°C)
close to heat sources like radiators, etc.
with extremely high humidity for example in humid cellars
close to water (Sink, bathtub, or similar equipment)
Cleaning
Use a soft and dry towel. We suggest using a nonabrasive microfi-
ber towel. Please do not use any solvents or liquidities
Service
Service by a qualified person required if
the mains-cable or the mains connectors are damaged
foreign substances or liquidity have entered the 755
the 755 has seen rain
the 755 seems to malfunction
the 755 has fallen to the floor or the housing is damaged

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User manual
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4Scope of delivery
Phono-preamplifier 755
Remote control
Power cord
User manual
5Rear panel
5.1 Mains (A)
Connect the phono-preamplifier 755 with the mains supply. In standby the 755 has
a power consumption of <0.5W (red LEDs in display).
Only switch-off the mains if your phono-preamplifier 755 is in standby.
5.2 MC-inputs IN 1/IN 2 (B)
Connect your turntables with MC-cartridges to input IN1 or IN2. Please use top
grade audio cables. The termination impedance can be adjusted to your cartridge.
Two gain levels can be selected +72dB @ 1kHz or +78dB @ 1 kHz.
If required the subsonic filter RIAA-IEC can be activated.
A
I

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5.3 MM-input IN 3 (C)
Connect your turntables with MM-cartridges to input IN3. Please use top grade au-
dio cables. The termination impedance can be adjusted to your cartridge.
Two gain levels can be selected +60dB @ 1kHz or +66dB @ 1 kHz.
If required the subsonic filter RIAA-IEC can be activated.
5.4 Main-Out (D)
Due to the exceptional load stability there are no restrictions regarding the selection
of your connecting cables. For long cable lengths we recommend using balanced
cables. A potential humm loop can be suppressed with the Ground-Lift switch (XLR
only).
Ground-Lift OFF = ground connected
Ground-Lift ON = ground disconnected
5.5 LINK (E)
The phono-preamplifier 755 can control the start-up sequence of soulution compo-
nents connected through the LINK System (cable: CAT 5, RJ45).
The phono-preamplifier 755 will trigger the switch on of connected components. It
will remain protected until all connected components are switched on. The display
shows LINK ERROR if a connected component does not switch on.
5.6 RS232 –Interface (F)
The phono-preamplifier 755 can be remote controlled through the RS232 interface.
All functions can be controlled and relevant information is provided to the control
unit.
5.7 Type label (G)
The type label shows the serial number and the nominal power consumption.

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User manual
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6Front panel
6.1 Power (H)
The Power-button defines the operating condition ON or OFF (red LEDs). The audio
circuits remain disconnected from the outputs until it is switched on.
Display in standby (OFF)
Display for PROTECT ON
Display for ON condition
We suggest switching the 755 to standby (OFF) while not listening to music. (Power
consumption <0.5 W).
Unplug the 755 from the mains before you manipulate with cables, before
cleaning, during thunder storms or before you leave for longer periods. Switch
the phono-preamplifier 755 to standby (OFF), before you unplug the mains.
6.2 Mute (I)
Mute allows disconnecting all inputs from the
outputs in case of an urgency (wrong cabling,
feedback loops, etc.).
For reducing the volume to a predefined level please use the function Volume-Dim.

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6.3 Prog (J)
The phono-preamplifier 755 can be adjusted to specific requirements of your sys-
tem. The Prog-button (de)activates the Programming-Mode.
6.4 Volume (L)
Volume +/-
0 = Mute
1 = min. volume
80 = max. volume
We suggest limiting the volume (Volume-Max function)
Volume-Dim
Pushing the Volume-knob (de)activates the Volume-Dim
function (Display for example „D 10“).As long as the Vol-
ume-Dim function is active the volume cannot be altered
by the Volume-knob.
6.5 Input (K)
Input Select
Selects the inputs
All other inputs remain disconnected

Phono-Preamplifier 755
User manual
page 11
7Program-Mode
7.1 Overview
The available Program-Functions allow adjusting the phono-preamplifier 755 to your
individual High-Fidelity setup.
.
Push on the Prog button switches the phono-preamplifier
755 between operating-mode and Program-Mode.
Timeout after 10 seconds.
Rotating of the Select knob allows selecting the desired
Program-Function
Push on the Select knob for approval of the selected
function. Now the value domain of the selected Program-
Function is active. (red LEDs in display).
Rotating of the Select knob allows for adjusting the de-
sired value.
Push on the Select knob for approval of the respective
value.

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7.2 Program-Functions
Function
Values
Remarks
IN 1, IN 2,
IN 3
Defines the active in put after
switch-on
ON, OFF
(De)activates the volume control
function.
1..30..50
Defines the volume after switch-on.
1..20..40
Defines the DIM-volume.
50...80
Defines the MAX-volume.
<- 9...0...9 ->
Sets the volume difference between
left and right channel.
MC: 10…1k
MM: 47…47k
0…750pF
Defines the impedance for inputs
IN1…IN3

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User manual
page 13
Function
Values
Remarks
MC: 72…78dB
MM: 60…66dB
Defines the gain for each input.
ON, OFF
(De)activates the RIAA-IEC high pass
filter.
ON, OFF
((De)activates Mono-mode.
ON = disconnected
OFF = connected
(De)activates Ground-Lift for the unbal-
anced output.
1 = low
2 = medium
3 = high
Adjusts the brightness of the display.
Loads the default-values (bold) for all
functions.
Displays firmware version.

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8Remote control
Button
Pre-Modus
CD-Modus
(1) IR-transmitter
Operation until 5m distance and angel of ±45°.
(2,3) 
Volume +/-
(4) DIM /
Volume-Dim
Play/Pause
(5/6) 
Select +/-
Next / Previous track
(7) 
Enter Function for Program-Mode
(8) P
(De)activates Program-Mode
(9)
Mute
-
(10)
ON / OFF
(11)
-
Open/Close
(12) PRE
-
Activates PRE-Mode
(13) CD
Activates CD-Mode
-
Change of Remote Ctrl ID:
Bring the remote control in PRE-mode and
press the respective buttons for approx. 5 seconds.
Preamplifier ID 1: (6), (5), (10)
Preamplifier ID 2: (6), (5), (9)
Phono (6), (5), (7)
DAC (6), (5), P(8)
Exchange of batteries (2 x AAA):
Open the battery tray on the rear side.
Insert the batteries into the tray as indicated.
Ensure correct polarity of the batteries.
Close the tray with corresponding screw.
Dispose the exhausted batteries

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User manual
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9Safety functions
Overcurrent
For currents > 1 A at the output the 755 Phono-preamplifier
shuts down automatically.
Power supply
The power supply is monitored for correct operation. In case of
an error the 755 gets shut down automatically.
Fuse
Model 220-240 V 2A/T 250V micro fuse 5x20mm
Model 100-120 V 4A/T 250V micro fuse 5x20mm
10 Warranty
All soulution products are guaranteed against defects in material and workmanship
for five years from date of purchase.
The guarantee is void if the product has been subject to misuse or negligence or has
been modified, repaired or opened by a non-authorised person without written au-
thorisation of Spemot AG.
For the return transport to our premises please use exclusively the original packag-
ing. Transport damages are not subject to this guarantee, repairs will be charged.
We recommend effecting transport insurance.
If you do not have the original packaging no more please contact your soulution
dealer.
Basic repairs may be completed by your soulution dealer. Please clarify whether he
is able to do the work before you send the product back to us.

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11 Trouble shooting
Error
Action
No Display
Check the cabling to the mains supply. Eventually replace
the fuse of your preamplifier 755.
No music
Check the following:
cabling to your (pre)amplifier, signal sources and from
the power amplifier to your loudspeakers
whether you have selected the correct input,
if the power amplifier is switched on
the LINK connection
POWER FAIL
If the power supply to the audio channels is interrupted or
an error in the power supply unit has occurred the phono-
preamplifier 755 is shut down automatically. The display
shows POWER FAIL.
OVERCURRENT
If the current at the Main-Out exceeds 1A the phono-
preamplifier 755 is shut down automatically. The display
shows OVERCURRENT.
Check the cabling to the power amplifier. This error may also
be provoked by defect or switched off power amplifier.
If you con not identify the error please disconnect the mains supply (before you dis-
connect the phono-preamplifier 755 has to be in operating condition OFF) and con-
tact your soulution dealer.
12 Service
If your soulution preamplifier needs service please contact your soulution dealer.
For further information see www.soulution-audio.com

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User manual
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13 Specifications
Data
General
Nominal voltage
Model 220-240V
220 - 240
V, 50-60 Hz
Model 100–120V
100 –120
V, 50-60 Hz
Nominal rating
250
W
Power consumption
(OFF)
<0.5
W
Power consumption
(ON)
60
W
MC - inputs:
IN 1 In 2
Voltage gain
+72...+78
dB
Bandwidth
(internal)
DC-1
MHz
Rise time
400
ns
THD+N
<0.0006
%
Impedance
(adjustable)
10-1‘000

MM - input:
IN 3
Voltage gain
+60...+66
dB
Bandwidth
(internal)
DC-1
MHz
Rise time
400
ns
THD+N
<0.0006
%
Impedance
(adjustable)
47 - 47‘000

0 -750
pF
Outputs
Voltage
Main-Out symmetrical
max. 16
Vrms@100
Main-Out asymmetrical
max. 8
Vrms@100
Current
max. 1
A
Impedance
Main-Out symmetrical
2

Main-Out asymmetrical
2

LINK-Out
+12
V
Dimensions
Dimensions
480x450x167
mm
Weight
ca. 30
kg
Technical specifications are subject to change without prior notification.

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14 Dimensions