Clef Audio Soloist-50 User manual

Soloist-50
O W N E R M A N U A L

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
The lightning flash with arrowhead symbol, within an equilateral
triangle, is intended to alert the user to the presence of uninsulated
“dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and
maintenance (servicing) instructions in the literature accompanying
the appliance.
CAUTION: Changes or modifications not expressly approved by the
party responsible for compliance could void the user's authority to
operate the equipment.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT
REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.
2

Please read all instructions and precautions carefully and
completely before operating your Soloist-50.
1. ALWAYS disconnect your entire system from the AC mains
before connecting or disconnecting any cables, or when
cleaning any component.
2. This product must be terminated with a three-conductor AC
mains power cord that includes an earth ground connection.
To prevent shock hazard, all three connections must ALWAYS
be used.
3. AC extension cords are not recommended for use with this
product
4. NEVER use flammable or combustible chemicals for cleaning
components.
5. NEVER operate this product with any covers removed.
6. NEVER wet the inside of this product with any liquid.
7. NEVER pour or spill liquids directly onto this unit.
8. NEVER block airflow through ventilation slots or heat sinks.
9. NEVER bypass any fuse.
10. NEVER replace any fuse with a value or type other than those
specified.
11. NEVER attempt to repair this product. If a problem occurs,
contact your Clef-Audio retailer.
12. NEVER expose this product to extremely high or low
temperatures.
13. NEVER operate this product in an explosive atmosphere.
14. ALWAYS keep electrical equipment out of the reach of
children.
15. ALWAYS unplug sensitive electronic equipment during
lightning storms.
Important Safety Instructions
3

4
From all of us at Clef Audio,
Thank you for choosing our product.

Unpacking .......................................................................................6
Installation Considerations ...........................................................7
Power Requirements ......................................................................8
Special Design Features .................................................................9
Protections ....................................................................................10
Front Panel ....................................................................................11
Rear Panel .....................................................................................12
Care & Maintenance .....................................................................13
Warranty.................................................................................................................14
Specifications ................................................................................15
Dimensions ...................................................................................16
Table of Contents
5

6
DO NOT attempt to lift or move the Soloist-50 without
adequate assistance. Failure to follow the procedures included
in this section may result in personal injuries and/or product
damage.
DO NOT attempt to lift the Soloist-50 while bending at the
waist. When lifting, stand as straight as possible using the leg
muscles to lift.
When unpacking the Soloist-50:
DO save all packing materials for possible future shipping needs.
DO inspect the Soloist-50 for signs of damage during shipment. If
damage is discovered, contact an authorized Clef Audio dealer for
assistance making appropriate claims.
Unpacking
Caution!
Warning!

Position the Soloist-50 on a stable, horizontal surface where there is
no risk of it being knocked, or subjected to vibration such as from
loudspeakers.
As a “CLASS A/AB” amplifier, the unit dissipates a quantity of
power at all times, and it is important that it is adequately
ventilated. The sides are perforated to allow the smooth flow of
heat through the unit. It is therefore not recommended that the
unit is enclosed in a cabinet or placed where the ventilation holes
on the sides are impeded as this could result in the unit cutting out
due to excessive heat build-up.
Soloist-50 must be protected from humidity - if the unit is
moved from a cold place to a warm room, leave the unit for an hour
or so to allow sufficient time for the moisture to evaporate.
Installation Considerations
Placement
Ventilation
7

8
When shipped, the Soloist-50 is configured for 220-230V AC power
operation at 50Hz. Before operating the Soloist-50 make sure the AC
mains connector label indicates the correct operating voltage for
the current location.
The Soloist-50 has three operating states:
1. Off
Power is disconnected from the AC mains connector or power
switch on rear panel is set “OFF” position.
2. Standby
Power is connected to a small power supply, and control
circuits.
The Soloist-50 consumes less than 30W of power.
3. On
Power is connected to the AC mains connector and all power
components.
The Soloist-50 should be unplugged during lightning storms and
extended periods of non-use. Otherwise, it is designed for
continuous operation. For best performance, make sure power is
connected to the AC mains connector at all times. During normal
operation, do not use the power switch (on the rear panel) to power
off the Soloist-50. Instead, use the on/off button to place the
Soloist-50 into standby.
Power Requirements
Continuous Operation
Operating States

This is the most linear of the amplifier classes, meaning the output
signal is a truer representation of what was imputed. The output
device (transistor) conducts electricity for the entire cycle of input
signal. In other words, they reproduce the entire waveform in its
entirety. These amps run hot, as the transistors in the power amp
are on and running at full power all the time.
Because of these factors, Class A amplifiers are very inefficient for
every watt of output power, they usually waste some watts as heat.
Because of the watts of heat energy released they run very hot,
needing lots of ventilation. But the upside is that these amps are
the most enjoyed of all amplifiers. These amps dig out musical
detail, since the transistor reproduces the entire audio waveform
without ever cutting off. As a result the sound is cleaner and more
linear; that is, it contains much lower levels of distortion. They are
the most accurate of all amps available.
Dual mono design topology. This gives the amplifier better isolation
between channels. Soundstage imaging is improved, offering true
soundstage width and depth. Instrument placement and layering
are more accurate.
The traditional potentiometer is implemented with an electrical
contact that slides over a resistive layer that cause the problem such
as quality of the electrical contact, consistency between separate
audio channels, sensitive to dust. DSA Volume ( Digital Controlled
Step Attenuator Volume) using discrete resistors and relays as
switches solve those problems and improve quality of sound.
Soloist-50 balanced input operates as a differential circuit, and any
unwanted noise, hum, or interference common to both lines is
therefore canceled .
Special Design Features
Class-A Design Circuit
Dual-Mono Design
DSA Volume
True Balanced Input
9

The Speaker Protection Circuit has two main functions:
1. To protect the power amplifier and the loudspeakers during
start-up sequence when the amplifier output might exhibit DC
voltage.
2. To protect the loudspeakers in the unlikely event of an amplifier
power stage failure, where DC component would damage the
speaker voice coil.
Protections
Speaker Protection
10

11
The numbers in the front panel illustration shown above
correspond with the numbered items that begin below.
1. On/Stand by Button
Places the Soloist-50 into standby mode and takes the
Soloist-50 out of standby mode. When the Soloist-50 is
powered on, pressing and releasing the On/Off button
places the Soloist-50 standby or takes the Soloist-50 out of
standby
2. Source Select Button
Press to select desired input sources. Soloist-50 has 4 input,
3 unbalanced inputs and one balanced input.
3. Source Select Display
Shows selected source.
4. Volume Level Display
Displays volume level, 0 is lowest volume and 63 is maximum
volume.
5. Volume Button
Rotate to adjust volume level.
Front Panel
Soloist-50
Source
Volume Level
Volume
Clef-Audio
3 4
21 5

The numbers in the rear panel illustration shown above correspond
with the numbered items that begin below.
1. Unbalanded Input
Plug the Unbalanced sources into these inputs.
2. Balanced Input
Plug the Balanced sources into these inputs.
3. Power (Breaker) Switch
Press this switch to "RESET" side to start Soloist-50 in standby
mode.
4. AC Input
Plug the supplied power cord into this connector and plug the
other end into electrical outlet.
5. Speaker Output
Connect the speaker cables to these terminals.
Rear Panel
12
BREAKER
AC IN
220V 50Hz
RIGHT CHANNEL
SPEAKER OUTPUT LEFT CHANNEL SPEAKER OUTPUT
S-1RS-2RS-3R
S-4R
(XLR)
RIGHT CHANNEL
SOURCE INPUT
Design and Manufactured by
CLEF-AUDIO COMPANY LIMITED
Bangkok THAILAND www.clef-audio.com
S-1L S-2L S-3L
S-4L
(XLR)
LEFT CHANNEL
SOURCE INPUT
Soloist-50
Stereo
Integrated
Amplifier
2 1 2
5 54
3

13
The Soloist-50 requires routine care and maintenance to ensure
optimal performance. The bulleted items included in this section
indicate maintenance procedures that should be performed on a
regular basis.
Failure to perform the maintenance procedures included in this
section may void the manufacturer’s warranty and/or standard
repair policies.
• Use a feather duster or a low-pressure blower to remove dust
from the Soloist-50 exterior surface.
• Use a soft, lint-free cloth to remove dirt and fingerprints from
the Soloist-50 exterior surface. Do not use a cloth made
with steel wool or metal polish. If needed, this cloth can be
dampened with isopropyl alcohol. Do not dampen the cloth
with Benzene, acetone-based cleaners, and other commercial
cleaners.
Do not apply liquid directly to the Soloist-50 exterior
surface. Doing so may damage electrical components.
• Refer to “Installation Considerations” for information about
preventative maintenance.
Care & Maintenance
Caution!
Note

14
Clef Audio warrants to the first end-user purchaser that Soloist-50
integrated amplifier when purchased from an authorized
Clef Dealer/Distributor, will be free from defective workmanship
and materials for the period stated below. Clef will at its option and
expense during the warranty period, either repair the defect or
replace the product with a new or remanufactured product or a
reasonable equivalent.
Two (2) years from the date on the original sales receipt or invoice
or other satisfactory proof of purchase.
The warranty described above is non-transferable, applies
only to the initial installation of the product, does not include
installation of any repaired or replaced product, does not include
damage to allied or associated equipment which may result for any
reason from use with this product, and does not include labor
or parts caused by accident, disaster, negligence, improper
installation, misuse (e.g. overdriving the amplifier or speaker,
excessive heat or cold or humidity, outdoor installation), or from
service or repair which has not been authorized by Clef Audio.
Limited two (2) years Warranty
Warranty Period
for this Product
Additional limitations
from warranty coverage

Specifications
15
Type
Configuration
Power Supply Transformer
Power Supply Capacitance
Class of operation
Single Ended Inputs (RCA)
Balanced Inputs (XLR)
Input Sensitivity
Input Impedance
Maximum Input Level
Output Device Types
Output Binding Posts
Output Power @ 8 ohms
Output Power @ 4 ohms
Volume Steps
Gain
Signal-to-noise Ratio
Frequency Response
Crosstalk @ 1kHz
THD (20Hz - 20kHz @ 1 watt)
THD (20Hz - 20kHz @ 50 watts)
Power Consumption @ idle/Max
AC Power Requirements
Shipping weight
Dimensions (w x h x d)
Solid State
Dual-Mono
2 x 200VA
120,000μF
A/AB (10W Class-A)
3 pairs
1 pair
160mV RMS
44 Kohms
3.6 Vrms Balanced/UnBalanced
Bipolars / 6 per channel
Gold-plated
50 Watts per channel
100 Watts per channel
63 Steps / 1.0dB
42dB
100dB @ full power
20Hz - 56kHz (+0/-3dB)
-100dB
< 0.01%
< 0.04%
200 / 300Watts
220-230V / 50Hz
18 kgs
432 x 112 x 400 mm.
Preliminary specifications - subject to change without notice.

Dimension, Soloist-50
432 mm
97 mm
112 mm
400 mm
Soloist-50
Source
Volume Level
Volume
Clef -Audio
BREAKER
AC IN
220V 50Hz
RIGHT CHANNEL
SPEAKER OUTPUT LEFT CHANNEL SPEAKER OUTPUT
S-1RS-2RS-3R
S-4R
(XLR)
RIGHT CHANNEL
SOURCE INPUT
Design and Manufactured by
CLEF-AUDIO COMPANY LIMITED
Bangkok THAILAND www.clef-audio.com
S-1L S-2L S-3L
S-4L
(XLR)
LEFT CHANNEL
SOURCE INPUT
Soloist-50
Stereo
Integrated
Amplifier
16

Clef Audio Company Limited
33/83 Soi Narknivas Narknivas Rd. Ladprao Bangkok 10230 THAILAND
Telephone: [phone] Fax: [phone]
Email: [email protected] Website: www.clef-audio.com