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Features

The Evolution 600e monaural amplifier sits in the middle of the Evolution e
Series. Powerful enough for almost any application, the Evolution 600e is the
amplifier choice in many stereo and home theater systems worldwide. This power
capability is coupled to a new green operating mode that reduces standby
electrical draw to a mere 2 Watts. As with all Evolution amplifiers, the
Evolution 600e development began with a question, "What is the most difficult
scenario this amplifier will face?" The answer is a 2 Ohm speaker load. When the
final design is complete, and the amplifier is presented with a typical 8 Ohm
speaker, it practically coasts. This amplifier simply sings with this
stress-free load connected. Outputting a daunting 600 watts of power and coupled
to Krell Evolution e Series circuit technology, the Evolution 600e is a velvet
hammer.

Power Supply

The Evolution 600e is equipped 2 2,200 VA transformers and 108,000 μF. This
power source is the backbone for the output of the Evolution 600e. With this
foundation, the Evolution 600e delivers 600 watts into 8 Ohms, 1,200 watts into
4 Ohms, and 2,400 watts into 2 Ohms. The FTC mandates that power ratings are
quoted using a 1,000 Hz sine wave into a fixed 8 Ohm resistor with final power
specification stated at 1% distortion. Krell engineering considers this
specification too lenient and not indicative of what an amplifier is required to
provide. Krell designs to a much stricter standard. Our power tests use a
20-20,000Hz signal into 8, 4, and 2 Ohm loads with our final specifications
stated for .1% distortion.

Internal high-current line conditioning circuitry effectively blocks RF noise
entering via the AC line and compensates for any asymmetry or DC offset in the
power waveforms. The amplifiers' low level and gain stages are powered via multi
regulated rails that provide total immunity from supply fluctuations and assure
noise-free circuit operation. Primary rail voltages are quasi-regulated,
enabling an "on-demand" supply of power that is highly responsive to dynamic
load.

Circuitry Highlights

Krell's new Active Cascode Topology™ is a significant departure from
traditional amplifier circuits where the positive and negative rail voltages are
each applied entirely across a single row of transistors. High voltage swing and
gain requirements dictate that the transistors be "pushed" into non-linear
operating regions and, in some cases, dangerously close to breakdown. Krell
topology divides the full voltage swing across multiple rows of transistors, and
all devices are active-biased (i.e., they all carry the audio signal). Because
individual transistors in the cascode array "see" only a proportional fraction
of the rail voltage, they operate in a region that provides optimum linearity,
gain, and safety. And because the devices are not being pushed to their limits,
the amplifier runs cooler and more reliably. The improved linearity and
stability greatly reduces the need for negative feedback, which is known to
cause sonic degradation. Krell Evolution power Amplifiers use only 14 dB of
feedback throughout the topology-a small fraction of the amount implemented in
typical designs.

Krell Active Cascode Topology™ offers several performance advantages. It
breaks through bandwidth limitations of conventional designs and delivers very
high current. The usable bandwidth of an Evolution 600e is 300 kHz; triple the
bandwidth of a typical high performance amplifier. The result is near perfect
performance in the audible range with no phase anomalies typical of lower
bandwidth designs. Because the "work" is spread across multiple devices, the
amplifier is more load tolerant. Open-loop output impedance is extremely
low-about one hundred times lower than with most power amplifiers-ensuring
exceptional speaker control. All of these performance gains are achieved while
maintaining a high rail voltage, which provides a beneficial "flywheel" effect-a
de facto regulation that enables the amplifier to better deal with sudden
changes in power requirement, such as those caused by large signal transients.

Evolution amplifiers feature Krell CAST technology. CAST is a unique circuit
and connection breakthrough that eliminates distortions inherent in voltage
based amplification. A complete Evolution (source, preamplifier, and amplifier)
system, connected with CAST interconnects reduces the number of voltage gain
stages to the minimum, one. The resulting noise floor is approaching the
theoretical limit of technology. Emanating from a completely black background,
music explodes from absolute silence moving the listener closer to the goal of
recreating the live musical event in the listening room.

제품 Specfications

Frequency response
20 Hz to 20
kHz +0, -0.18 dB
<0.5 Hz to 120 kHz +0, -3 dB

Signal-to-noise ratio
>110 dB, wideband, unweighted, referred to full power
output
>119 dB, "A"-weighted

Gain
25.4 dB

Total harmonic distortion
<0.02% at 1 kHz, at 600 W, 8 Ohms
<0.15% at 20 kHz, at 600 W, 8 Ohms

 
Input impedance
Single Ended: 100 kOhms
Balanced: 200 kOhms
CAST: 70 Ohms

Input sensitivity
Single Ended or Balanced: 3.72 V rms
CAST: 3.72 mA rms

Output power
600 W RMS at 8 Ohms
1200 W RMS at 4 Ohms

Output voltage
196 V
peak-to-peak
69 V RMS

Output current
49 A peak

Slew rate
100 V/μs

Output Impedance
<0.030 Ohms, 20 Hz to 20 kHz

Damping Factor (referred to 8 ohms)
>270, 20 Hz to 20 kHz

Transformer
Two 2200 VA (4400 VA total) for audio
circuitry
One 10 VA for digital control circuitry

Power Supply Capacitance
108,000 μF

Power consumption
Standby: 2 W
(High-current standby: 260W)

Idle: 410 W
Maximum: 3800 W

Heat Output
Stand-by: 7 BTU/hr.
(High-current standby: 890 BTU/hr.
Idle: 1400 BTU/hr.
Maximum: 5500
BTU/hr.

Inputs
1 single-ended via RCA connector
1 balanced via XLR connector
1 CAST via 4-pin bayonet connector

Outputs
1 pairs Krell binding posts

Dimensions
17.3 in. W x 9.8 in. H x 22.1 in. D
438 mm W x 248 mm H x 560 mm D

Weight
Shipped: 150 lb., 67.9 kg
Unit Only: 135 lb., 61.1 kg