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NAME :

 Evolution 900e

PRODUCT IMAGE :

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MANUFACTURER :

Krell

SPECIFICATIONS :

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

-3 dB Signal-to-noise ratio >113 dB, unweighted, referred to full power output >122 dB, "A"-weighted Gain 25.4 dB

Total harmonic distortion <0.02% at 1 kHz, at 900 W, 8 Ohms <0.15% at 20 kHz, at 900 W,

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

Input sensitivity Single Ended or Balanced: 4.55 V rms CAST: 4.55 mA rms

Output power 900 W RMS at 8 Ohms 1800 W RMS at 4 Ohms

Output voltage 240 V peak-to-peak 85 V RMS

Output current 60 A peak Slew rate 90 V/µs Output Impedance <0.023 Ohms, 20 Hz to 20 kHz      

 Damping Factor (referred to 8 ohms) >350, 20 Hz to 20 kHz Transformer Two 3000 VA (6000 VA total) for audio circuitry One 10 VA for digital control circuitry Power Supply Capacitance 108,000 µF 

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BRIEF DESCRIPTION :

The Evolution 900e is the most powerful member of the Evolution Series. At a staggering 3,600 watts into a 2 Ohm load, the Evolution 900e is a virtually limitless source of power for any speaker. This power capability is coupled to a new green operating mode that reduces standby electrical draw to a mere 2 Watts. While power is essential for lifelike volume levels and realistic dynamics, the true benefit of this engine is its ability to dominate a speaker and extract the ultimate performance from any speaker design. Dedicating one amplifier per speaker is the recognized best path to ultimate performance. As such, the Evolution 900e is a monaural design requiring two for stereo reproduction or left and right power amplifiers in a home theater system.  

DESCRIPTION :

 FEATURES:

Power Supply The Evolution 900e is equipped with two 3,000 VA transformers and 108,000 µF. This power source is the backbone for the output of the Evolution 900e. With this foundation, the Evolution 900e delivers 900 watts into 8 Ohms, 1,800 watts into 4 Ohms, and 3,600 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.


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