Bel Canto Design Stereo Amplifier eVo2 User Manual

User's Guide and Operating Information  
eVo2  
eVo4  
eVo6  
Digital Power Processor  
Audio Power Amplifiers  
Bel Canto Design, LTD.  
212 Third Avenue North  
Minneapolis, MN 55401  
Phone: (612) 317.4550  
Fax: (612) 359.9358  
©2002-2004 Bel Canto Design, LTD  
 
Design Features  
• High efficiency Digital Power  
• Damping Factor >100  
Processing output stage for cool  
operation  
• High thermal stability in all stages  
• Regulated, low noise supplies for all  
analog stages  
• Analog signals are processed at small  
signal level, all large signal power is  
generated using the switching output  
stage  
• Audio Grade decoupling capacitors  
and resistors used throughout  
• 700 watts of continuous power  
output capability in Balanced  
Mono mode  
• Soft clipping insures graceful over  
load  
• High efficiency ‘green’ amplification  
• Optimized balanced and single-  
ended input stage  
• Comprehensive protection circuitry  
outside the signal path  
• THD and IMD <0.05%  
The eVo Digital Output Stage and Digital Power Processor  
The Bel Canto Design eVo digital out-  
put stage is of unique simplicity. The  
output uses 2 N channel MOSFET  
switches switching between the  
power supply rails. These switches  
turn on and off within 30 billionths of  
a second and provide an onresis-  
tance path to the supplies of a few  
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 sup-  
ply and the negative is balanced to  
provide no audio frequency output.  
The switching stage is isolated from  
the loudspeaker by a single LC filter  
stage. This 80kHz second order filter  
is used to reject high frequency ener-  
gy and maintain linear phase  
Furthermore, the digital power  
processor adds small levels of high  
frequency dither to insure that an  
inherently linear output stage charac-  
teristic 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 ener-  
gy 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 high frequency energy  
and maintains excellent phase  
response.  
response.  
© 2002-2004 bel canto design, Ltd.  
page 3  
eVo User’s Guide 042104  
 
Design Features (cont’d)  
Feedback is taken before the LC filter  
Warm-Up  
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, optimiz-  
ing the linearity of the output stage.  
The eVo amplifier’s sonic perform-  
ance will continue to improve over  
the first several weeks of operation.  
Because of the very low standby  
operating power we recommend  
continuous power-up unless the sys-  
tem is not to be used of an extended  
period. This will prolong the amplifi-  
er’s life and insure optimum perform-  
ance at all times..  
Warning!  
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 eVo amplifier (do not remove the chassis cover). There  
are no user serviceable parts inside. Any tampering of internal parts will imme-  
diately void your warranty.  
Complete and mail the Owner's Registration Card immediately in order to  
activate your warranty.  
© 2002-2004 bel canto design, Ltd.  
page 4  
eVo User’s Guide 042104  
 
Unpacking your new Evo  
The box containing your eVo amplifier contains the following parts:  
1 (one) - eVo audio power amplifier  
1 (one) - eVo 2/4/6 User's Guide  
1 (one) - 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 miss-  
ing, 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.  
Warning!  
The eVo amplifier’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 con-  
tact your dealer immediately. Do  
not attempt to alter or change power  
settings yourself!  
© 2002-2004 bel canto design, Ltd.  
page 5  
eVo User’s Guide 042104  
 
Initial Setup  
Please refer to the front and rear panel diagrams, as needed. [Page 8]  
Line Level Inputs  
Two inputs per channel are provided.  
Warning:  
The RCA jack is a standard input that  
accepts single-ended sources. The  
female XLR jack allows true balanced  
hookup operation using the standard  
pin configuration:  
Always disconnect power  
to the amplifier when  
changing cables.  
Pin 1 Ground  
Pin 2 Input +  
Pin 3 Input -  
Optimizing Input Grounds  
System ground optimization is criti-  
cal to achieving low noise perform-  
ance. This is especially critical when  
using the RCA inputs.  
to the power ground at the amplifier.  
Try connecting the RCA ground to  
chassis ground by depressing the  
RCA/XLR switch button (RCA posi-  
tion). If this button is depressed and  
there is ground noise or hum then try  
setting this switch in the XLR posi-  
tion.  
The XLR/RCA switch is used to opti-  
mize the grounding at the amplifier  
inputs. Setting the XLR/RCA switch in  
the RCA position connects the RCA  
ground to the chassis and the power  
cable.  
Putting this switch in the XLR posi-  
tion effectively lifts the RCA ground  
on the amplifier input and can pre-  
vent ground loop noise. This is espe-  
cially useful for systems using more  
than one amplifier chassis or when  
using the eVo4 or eVo6 amplifiers in  
a system.  
If using Balanced XLR cables then  
leave the switch in the XLR position,  
otherwise the negative XLR input will  
be shorted to the amplifier ground.  
If using the RCA inputs and the  
Preamplifier has a floating ground  
then using the RCA switch position  
will give the lowest noise operation.  
This will connect the system ground  
These procedures should be ade-  
quate to correctly ground most  
systems.  
© 2002-2004 bel canto design, Ltd.  
page 6  
eVo User’s Guide 042104  
 
Loudspeaker Connection and Power Output Options  
post until the center plug comes out.  
Warning!  
Do not connect speaker terminals to  
a chassis or earth ground connection.  
The Anti-Phase operation of the out-  
puts would result in one of the active  
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.  
Connect loudspeakers to the outputs  
of the eVo amplifier using the 5-way  
binding posts located on 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 the binding  
Balanced Mono Mode Operation  
High-power balanced mono operation  
can be obtained with the simple push  
of a button. Connect one input cable to  
any of the 4 input jacks on an eVo2 or  
input jack sets on an eVo4 or eVo6.  
Then depress the MONO/STEREO  
mode button. Connect the loudspeaker  
to the output terminals indicated for  
mono-mode operation on the back  
panel.  
© 2002-2004 bel canto design, Ltd.  
page 7  
eVo User’s Guide 042104  
 
Power On and Operation  
The front panel switch or rear panel  
12 volt trigger input is used to power  
on the amplifier. When using the 12  
volt trigger the front panel switch  
should remain in the off (out) posi-  
tion. The eVo amplifiers have been  
designed to remain powered up at all  
times, their very low standby power  
is conducive to this. The blue front  
panel LED remains on when the eVo  
is in normal operating mode. When  
the amplifier shuts down in protec-  
tion mode a small red LED lights next  
to the front panel power switch. If  
this occurs, remove power and  
insure that no output terminal is con-  
nected to ground or to another termi-  
nal. 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, distribu-  
tor or Bel Canto Design.  
eVo2  
eVo4  
eVo6  
© 2002-2004 bel canto design, Ltd.  
page 8  
eVo User’s Guide 042104  
 
Amplifier Placement  
We do not recommend placing  
weights or other objects directly on  
the eVo. This may mar or scratch the  
chassis finish. Dampen a soft cotton  
cloth with warm water for cleaning  
the outer surfaces.  
eVo Amplifier Placement  
Within Your System  
The most typical arrangement places  
the eVo on the lower shelf of a rack  
or shelf unit; some users prefer to  
have the eVo on its own stand.  
Because the eVo runs so cool it can  
be placed in many system locations  
without compromise.  
Specifications  
eVo2  
eVo4  
eVo6  
Output power  
@ 8 Ohms  
2 Ch.  
120 W  
240 W  
23dB  
1 Ch.  
400 W  
700 W  
29dB  
4 Ch.  
120 W  
240 W  
23dB  
2 Ch.  
400 W  
600 W  
29dB  
6 Ch.  
120 W  
240 W  
23dB  
3 Ch.  
360 W  
600 W  
29dB  
@ 4 Ohms  
Gain  
Bandwidth  
1Hz -80KHz ˇ3dB  
1Hz -80KHz ˇ3dB  
< 0.05% THD at 1WRMS  
>100, below 100Hz  
100k/200k Bal  
1Hz -80KHz ˇ3dB  
< 0.05% THD at 1WRMS  
>100, below 100Hz  
100k/200k Bal  
THD and Noise  
Damping Factor  
Input Impedance  
Inputs  
< 0.05% THD at 1WRMS  
>100, below 100Hz  
100k/200k Bal  
XLR & RCA  
XLR & RCA  
XLR & RCA  
Outputs  
2 pr. 5-Way  
4 pr. 5-Way  
6 pr. 5-Way  
Ide Power Draw  
Dimensions-inches WxDxH  
Dimensions-mm WxDxH  
Weight  
15 Watts  
30 Watts  
45 Watts  
17.5 in x 14.5 in x 4.5 in  
44.5 cm x 37 cm x 11.5 cm  
36 lbs (14.5 kg)  
17.5 in x 18.5 in x 4.5 in  
44.5 cm x 47 cm x 11.5 cm  
40 lbs (18kg)  
17.5 in x 18.5 in x 4.5 in  
44.5 cm x 47 cm x 11.5 cm  
42 lbs (19 kg)  
Features and specifications are subject to improvements and changes without prior notice.  
© 2002-2004 bel canto design, Ltd.  
page 9  
eVo User’s Guide 042104  
 
Bel Canto Design, LTD.  
212 Third Avenue North  
Minneapolis, MN 55401  
Phone: (612) 317.4550  
Fax: (612) 359.9358  
©2002-2004 Bel Canto Design, LTD  
eVo™ is a trademark of Bel Canto Design, LTD  
 

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