BelCantoDesign
eVo200.2
Digital Power Processor
Audio Power Amplifier
User's Guide and
Operating Information
Bel Canto Design • 212 Third Avenue North–Suite 345 • Minneapolis, MN
Phone: (612) 317.4550 • Fax: (612) 359.9358 • Email: Info@BelCantoDesign.com © May, 2001
55401
eVo200.2 Digital Power Processor, Audio Power Amplifier
The eVo200.2 is a dual configuration, stereo/mono power audio amplifier using a unique Bel Canto
Design, eVo Digital Power Processor circuit architecture.
Contents
Bel Canto Design Statement 3
Design Features 4
Unpacking 5
Initial Setup 6
Amplifier Placement &Specifications 7
Warranty 8
eVo200.2 Owner's Manual Page 2
Bel Canto grew from the quest to achieve the ultimate musical satisfaction
from an audio system. This goal began with the discovery of the inherent sonic
qualities and musical performance potential of a nearly forgotten technology, the
single-ended triode amplifier. The ability of this type of amplifier to recreate the
musical experience and evoke a powerful emotional response in the listener, much like
the live event, inspired the development of the SET line of amplifiers through the
ultimate expression of this technology. The SET amplifier was developed as both a
cornerstone for a modern audio system and as a reference tool to explore newer
technologies that delivered the single-ended triode amplifier's uniquely musical
presentation.
For the better part of a decade this quest continued and has resulted in the
birth of a line of fine audio components in Bel Canto's eVo digital amplifiers and
matching components. These components share the inherent musical qualities of the
reference amplifier, while achieving a new level of value and performance using the
latest analog and digital technologies. The eVo200.2 is the first digital amplifier in this
new line and represents a significant advancement in home entertainment technology.
The eVo200.2 presented in the following pages is designed to maintain
very high value because of both the quality of design and manufacturing and also the
timelessness of each component's musical performance.
Bel Canto Design
eVo200.2 Owner's Manual Page 3
Design Features
• High efficiency Digital Power Processing
output stage for cool operation
• Small signal analog processing
• > 800 watts short term continuous power
output capability in Mono mode
• Optimized balanced and single-ended input
stage
• THD and IMD <0.01%
• Damping Factor >100
• High thermal stability in all stages
• Fully regulated, low noise supplies for all
analog stages
• Audio Grade decoupling capacitors and
resistors used throughout
• Soft clipping performance with
uncompromised low level distortion
performance
• Anti-phase dual channel operation.
• High efficiency for ‘green’ amplification
• Protection circuitry outside signal path
second order low pass filter is used to reject
high frequency energy and optimize phase
response – while preserving high frequency
information.
Furthermore, the digital power processor adds
small levels of high frequency dither to insure
that an inherently linear output stage
characteristic is maintained from very low to
very high output levels. The audio frequency
information modulates the output stage by
changing the time relationship between the
positive and negative supply rails. The critical
timing information is controlled by the digital
power processor and the effective switching
frequency is changed over a 200 kHz to 1500
kHz range. This spreads the digital energy
created by the amplifier over a wide bandwidth,
greatly reducing the energy at any one
frequency. This permits using a simple LC filter
to remove the digital energy and maintains
excellent phase response. Feedback is taken
from the common node of the output switches
before the LC filter and fed back to the digital
power processor. This feedback is used to
insure that any variations in the switching speed
of each output device are compensated for,
optimizing the linearity of the output stage.
The eVo Digital Output Stage and Digital
Power Processor
The Bel Canto Design eVo digital output stage is
of unique simplicity. The output uses 2 N
channel MOSFET switches which are switched
between the power supply rails. These
switches turn on and off within 30 billionths of a
second and provide an on resistance path to the
supply of less than 65 thousandths of an ohm.
These switches switch alternately between the
supplies at a rate over 600,000 cycles per
second (600 kHz). When no audio signal is
present, the ratio between the time at the
positive supply and the negative is balanced to
provide no audio frequency output. The
switching stage is isolated from the loudspeaker
by a single Inductor/Capacitor. This 80kHz
eVo200.2 Owner's Manual Page 4
Warm-Up
The eVo200.2’s sonic performance will start to
stabilize after approximately forty (40) hours of
continuous power up.
Unpacking
Unpacking
The box containing your eVo200.2 contains the
following parts:
1 - eVo200.2 audio power amplifier
1 - eVo200.2 User's Guide
1 - Power Cable for connection to utility
power [6' 7" - 2 meters long]
Carefully unpack each piece and check for
shipping damage. If there is any damage, or if
a piece is missing, please contact your dealer or
Bel Canto Design, Ltd. Save all packing
materials as the packing is specially designed
to protect the amplifier for shipping or
transporting. If you lose or damage the packing
materials or carton, please contact your dealer
or distributor before attempting to transport the
amplifiers.
The eVo200.2's power supply is preset for
the proper national voltages before you
receive it. The power cable will have the
correct plug for your local power system.
If you believe this is not true, please
contact your dealer immediately. Do not
attempt to alter or change power settings
yourself!
Do not connect power to this amplifier yet!
This amplifier, like any electrical component, can be dangerous and cause injury unless correct
handling procedures are observed and used. Before powering this amplifier it is necessary to
read and follow proper setup and use procedures.
Do not open up your eVo200.2 (do not remove the chassis cover). There are no user serviceable
parts inside. Any tampering of internal parts will immediately void your warranty.
Complete and mail the Owner's Registration Card immediately in order to activate your warranty.
eVo200.2 Owner's Manual Page 5
Warning
Initial Setup
Line Level Inputs
Two inputs per channel are provided. The RCA
jack is a standard input that accepts singleended sources. The female XLR jack allows
true balanced hookup operation using the
standard pin configuration:
Pin 1 Ground
Pin 2 Input +
Pin 3 Input -
If there is a problem with noise or hum at the
amplifier outputs when using a single-ended
source, this may be due to the ground side of
the RCA jack is not connected to the circuit
ground of the amplifier. To connect this to the
ground depress the RCA/XLR switch button.
This should be adequate to correctly ground
most systems with stereo preamplifiers.
Loudspeaker Connection and
Power Output Options
Connect loudspeakers to the outputs of the eVo
amplifier using the 5-way binding posts located
the rear of the amplifier. The red or black center
plug in the output post can be removed for use
with banana type connectors. Unscrew binding
post until the gold pin in the bare wire hole is
visible. Remove the center pin by first pushing
one end in, and then, using serrated needle
nose pliers, pull the center pin out from the other
side. Do not connect speaker terminals to a
chassis or earth ground connection. The AntiPhase operation of the outputs would result in
one of the red (positive) outputs being
connected to ground and cause the amplifier to
go into protection mode and shut itself off. Also
when connecting the amplifier in balanced-mode
mono operation both terminals are driven
actively and can not be grounded. Make certain
that any output terminal is not connected to a
chassis or earth ground.
Mono mode operation
Mono power delivery can be obtained with the
simple push of a button. Connect one input
cable to any of the 4 input jacks and depress
the RCA/XLR button to select the appropriate
input. Then, depress the mono/stereo mode
button. The loudspeakers are then connected to
the output terminals indicated for mono-mode
operation on the back panel.
Power On and Operation
The rear panel has a master power switch for
the eVo200.2. The eVo200.2 has been
designed to remain powered up at all times. The
blue front panel LED is on when the eVo200.2
is in normal operating mode. When the amplifier
shuts down in protection mode a small red LED
lights next to the blue LED. If this occurs, turn
off the main power switch and insure that no
output terminal is connected to ground or to
another terminal. Restore power and the
amplifier should return to normal operation. If
not then there may be an internal fault and the
amplifier should be returned to an authorized
service center. Contact your dealer, distributor
or Bel Canto Design.
eVo200.2 Owner's Manual Page 6
Amplifier Placement
eVo200.2 Placement Within
Your System
The most typical arrangement places the
eVo200.2 on the lower shelf of a rack or shelf
unit; some users prefer to have the eVo200.2
on its own stand.
Whichever method is preferred, it is
recommended to use a high quality type stand
capable of dissipating vibration and resonance
into the floor area.
Specifications
Power output per channel into 8 ohms • 120 watts <1% THD+N
Power output per channel into 4 ohms • 200 watts <1% THD+N
800 watts short term continuous Mono
Bandwidth: + or - 3dB • 1Hz-80KHz
Input level for full stereo output • 2 Volts RMS
Signal to Noise Ratio @ 1 watt out • >96 dB A weighted, 20 kHz
Distortion @ 1 watt / 1kHz • <0.05%
Damping Factor • >100
Input configuration and impedance • single-ended/balanced 100Kohm
Stereo Mode Gain • 26 dB
Power Requirements • 100-120 VAC 50-60 Hz or 220-240 VAC 50-60 Hz
30-1000 Watts
Dimensions • 17.5" W x 14.5" D x 4.5" H (445 mm x 368 mm x 114 mm)
Weight • 30 lbs. (13 kg)
Because the eVo200.2 runs so cool it can be
placed in many system locations without
compromise.
We do not recommend placing weights or other
objects directly on the eVo200.2. This may mar
or scratch the chassis finish. Dampen a soft
cotton cloth with warm water for cleaning the
outer surfaces.
eVo200.2 Owner's Manual Page 7
Warranty Information
Please take a moment to fill out your warranty registration sheet. Returning this
registration validates your warranty and allows us to send you information on
product updates and new product development. This information will be filed with
your amplifier’s build documents and will not be used for any other purposes. This
information will not be sold or released outside Bel Canto Design. Your comments
and suggestions help us continue to improve upon our products and services.
Bel Canto Design products are automatically covered by a 90 day factory
warranty. With no additional cost, you have the option to extend your warranty to
a 5-year limited warranty by completing and returning the enclosed warranty
registration form within 30 days of purchase, along with a copy of the original
sales receipt from an authorized Bel Canto Design dealer. This will ensure prompt
warranty coverage. This warranty is only valid to the original owner who has
returned the warranty sheet along with a copy of the original sales receipt,
covering all internal parts and workmanship. This warranty is void if damage is due
to abuse, neglect, or unauthorized modification. The cost associated with the
return of this unit is the sole responsibility of the owner.
Bel Canto Design products are uniquely identified with a serial number on the
back panel of each unit. This number is required to validate your warranty. Please
reference the serial number if service is required. If you have any questions,
comments, or if we can be of service, please contact us Monday through Friday
9:00 a.m. - 5:00 p.m. central time.
Bel Canto Design
212 3rd Avenue North
Suite 345
Minneapolis, MN 55401
Phone: 612-317-4550
Fax: 612-359-9358
Info@belcantodesign.com
eVo200.2 Owner's Manual Page 8
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