Bel Canto Design EVO 4 gen 2

FROM STEREO TIMES:

Conclusion

This amp accomplished miracles with the Quad 989, and I wish I could have heard what it could have done for other speaker designs. However, I did have had the opportunity to hear a few other amplifiers that actually exceeded the eVo's transparency, detail and deep bass control. But I still have yet to hear an amp that is so exceptional in all areas. I have a feeling this amp could steal quite a few tube-lovers' hearts as well as those who are inclined to remain within the solid state. You would expect this from a $20,000 design, but not from $4,000. Call it a miracle, call it a steal or call it a dream. This is the Bel Canto eVo4 in a nutshell-and it's not a dream.

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 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 response.

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.

 
High efficiency Digital Power Processing output stage for cool operation

Analog signals are processed at small signal level, all large signal power is generated using the switching output stage

700 watts of continuous power output capability in Balanced Mono mode

Optimized balanced and single- ended input stage

THD and IMD <0.05%

Damping Factor >100

High thermal stability in all stages

Regulated, low noise supplies for all analog stages

Audio Grade decoupling capacitors and resistors used throughout

Soft clipping insures graceful over load

High efficiency ‘green’ amplification

Comprehensive protection circuitry outside the signal path

SPECS:

Bandwidth 1Hz -80KHz ˇ3dB

THD and Noise < 0.05% THD at 1WRMS

Damping Factor >100, below 100Hz

Input Impedance 100k/200k Bal

Inputs XLR & RCA

Outputs 4 pr. 5-Way

Ide Power Draw 30 Watts

17.5 in x 18.5 in x 4.5 in

44.5 cm x 47 cm x 11.5 cm

40 lbs (18kg) 

4 Ch.

120 W

240 W

23dB

2 Ch.

400 W

600 W

29dB 

 
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NOTE: I ONLY SELL TO LOWER 48 U.S.