美国KRELL/奇力 Evo 302e 双声道后级功放

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发布时间: 2014-02-12 14:12:52 付款方式: 支付宝
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美国KRELL/奇力 Evo 302e 双声道后级功放 原装进口全新正品

The Evolution 302e is a powerhouse stereo amplifier in a compact chassis.
Packing advanced Evolution circuit technology and prodigious power output, the
Evolution 302e delivers superior performance in smaller scale applications. This
power is coupled to a modest 2 watt power draw when in standby mode. Perfectly
matched with an Evolution 222 preamplifier for stereo application, the Evolution
302e also shines as the Left and Right amplifier when coupled to an S-1200
Surround Preamplifier/Processor in a home theater system.

Power Supply
The Evolution 302e is equipped with a massive with a 3000 VA transformer. This
power source is the backbone for the output of the Evolution 302e. With this
foundation, the Evolution 302e delivers 300 watts into 8 Ohms, 600 watts into 4
Ohms, and 1,200 watts into 2 Ohms with all both channels driven simultaneously.
The FTC mandates that power ratings are quoted using a 1000 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.
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 302e is 300 MHz; 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.



KRELL EVO 302e双声道后级

产品参数:

输出功率(每声道):300 W(8 ohms)600 W (4 ohms) 1200 W (2 ohms)
频率响应:20Hz-20kHz+0,-0.18dB;117 dBA计权
增益:25.5dB
总谐波失真: 150,20Hz-20kHz
输入:2个CAST,2个平衡;2个RCA
体积(W×H×D):438×248×525 mm
机身重量:54.3千克
运输重量:62.4千克
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