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发表于 2018-2-22 23:30:14
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贴一篇互联网上关于NAD M22的功能介绍文章：
Brand New NAD Masters Series M22 Stereo power amplifier
Product Research
Features
Hybrid Digital Amplification: The NAD M22 stereo power amplifier is using the latest nCore amplifier technology licensed from Hypex which offers distortion below measurement, ultra-high damping factor, and unconditional stability with any speaker. The result is tight, detailed sound with amazing control and transparency. With nCore, Hypex has refined their amplifier concept to new levels of perfection by improving the modulator for more accurate feedback subtraction and PWM generation. The all-discrete driver and output stage have also been improved for lower open-loop THD as well as lower idling losses, normally conflicting requirements with conventional IC driver circuitry. An added control loop incorporating an integrator with adaptive clipping enables 20dB more feedback to be used across the audio band because of its extremely low-phase shift resulting in a dramatic reduction in distortion across the audio band. This is added to nCore's already amazing characteristics of load invariance and high current capability, common characteristics of great-sounding amplifiers.
PowerDrive: The M22 uses NAD's proprietary Digital PowerDrive amplifier technology that allows substantial additional power for short periods of time. Employing the latest generation of NAD's digital PowerDrive, the M22 offers a minimum of 250W per channel with amazing reserves of dynamic power at lower impedances. The M22 is capable of >300W dynamic power per channel even in 8 ohms, and >600W in 2 ohms. It can effortlessly power any loudspeaker to live performance levels with amazing efficiency and low power consumption. Control for PowerDrive is derived by sensing the average output power, applying a time constant, and then cleanly hard clipping the signal thus limiting it to the rated continuous clipping power over a sustained loading. By controlling the power envelope maximum clean power is obtained for every operating condition.
Note: Research has shown that the peak to average power required to faithfully reproduce music can be a factor of ten for well recorded performances. Digital PowerDrive uniquely satisfies this requirement. Music sounds more dynamic and "open" with PowerDrive because the musical transients that are present in a live performance are not reduced in amplitude or "compressed".
Unique Circuit Topology: The output stage is only one of several circuits in the amplifier, and each must complement the other to obtain optimal performance. The amp is DC coupled throughout, from input to output, there is no capacitor in the forward signal path. Yet, it has a beneficial 12dB/octave roll-off below 2Hz. It does this using a unique circuit topology that is functionally a forward servo. It is however not a servo in the traditional sense as it does not measure DC at the output and send back a correction signal. Instead part of the input signal is fed to a side chain with a second order low-pass filter. The output of this is subtracted from the forward signal input to the second stage thus rejecting DC.
Dynamic Power Supply: The performance of the entire signal path is critically dependent on the power supply; in this case a well regulated, but not too tight, custom switch mode design. This allows maximum dynamic power, very high current yet with very low distortion. Secondary supplies are individually regulated and decoupled at each op-amp for lowest possible noise and maximum dynamic range.
Balanced & Unbalanced Inputs: The NAD M22 offers balanced XLR and unbalanced RCA connectivity.
Binding Post Speaker Terminals: The NAD M22 is equipped with four gold-plated, color-coded binding post terminals to connect your speaker wire. The binding post speaker terminals will accept bare wire (16-10 AWG), pin-connectors, or banana plugs (single only).
+12V Trigger Input: The +12V Trigger input allows the M22 to be switched remotely from "Standby Mode" to "On" and vice-versa by your preamplifier or AV processor that is equipped with a 12V trigger output.
Auto Standby: The M22 can be setup to automatically go to standby mode if there is no active source input for approximately 30 minutes.
Protect Mode: If the Protect LEDs turn red, this indicates that the protection circuitry of the M22 has been engaged. This may occur if there is a short-circuit in one of your speaker wires or excessive heat build-up.
大致译文：
全新的NAD Masters系列M22立体声功率放大器
产品研究
特征
混合数字放大：NAD M22立体声功率放大器采用Hypex授权的最新nCore放大器技术，可提供低于测量值的失真，超高阻尼因数以及任何扬声器的无条件稳定性。结果是紧凑，细致的声音与惊人的控制和透明度。借助nCore，Hypex通过改进调制器以实现更精确的反馈减法和PWM生成，将其放大器概念完善至完美的新水平。全分立驱动器和输出级也得到了改进，以降低开环THD以及较低的怠速损耗，通常与传统IC驱动器电路相冲突。增加一个带有自适应削波积分器的控制环路，可以在整个音频频带上使用20dB以上的反馈，因为它的极低相位偏移导致整个音频频带的失真急剧下降。这增加了nCore已经令人惊叹的负载不变性和高电流能力的特性，这是高音放大器的共同特性。
PowerDrive：M22采用NAD专有的数字PowerDrive放大器技术，可在短时间内提供大量附加功率。采用最新一代NAD的数字PowerDrive，M22每个通道至少提供250W的功率，并在较低的阻抗下提供惊人的动态功率储备。即使在8欧姆的情况下，M22每个通道的动态功率也能> 300W，而2欧姆的功率则大于600W。它可以毫不费力地为任何扬声器供电，以惊人的效率和低功耗实现性能水平。 PowerDrive的控制是通过检测平均输出功率，应用时间常数，然后干净地硬剪切信号，从而将其限制在持续负载下的额定连续削波功率来获得的。通过控制功率包络，可以获得每种运行条件下的最大清洁功率。
注意：研究表明，忠实地再现音乐所需的峰值到平均功率可能是记录良好的表演的十倍。数字PowerDrive独特地满足了这一要求。音乐听起来更具动态性，PowerDrive“开放”，因为现场演出中存在的音乐瞬态没有减小幅度或“压缩”。
独特的电路拓扑结构：输出级只是放大器中几个电路中的一个，每个电路都必须与其他电路互补以获得最佳性能。放大器从输入到输出始终是直流耦合，正向信号路径中没有电容。然而，在2Hz以下它有一个有利的12dB /倍频程滚降。它使用功能上是前向伺服的独特电路拓扑来实现这一点。然而，它不是传统意义上的伺服器，因为它不会在输出端测量直流电压并发回校正信号。相反，部分输入信号通过二阶低通滤波器馈入侧链。将其输出从输入到第二级的正向信号中减去，从而拒绝DC。
动态电源：整个信号路径的性能严重依赖于电源;在这种情况下，一个调节良好但不太严格的定制开关模式设计。这允许最大的动态功率，非常高的电流和非常低的失真。次级电源在每个运算放大器中单独调节和解耦以实现最低噪声和最大动态范围。
平衡和非平衡输入：NAD M22提供平衡式XLR和非平衡式RCA连接。
绑定接线柱扬声器端子：NAD M22配备了四个镀金的彩色接线柱接线端子，用于连接扬声器线。接线柱式扬声器端子将接受裸线（16-10 AWG），引脚连接器或香蕉插头（仅限单个）。
+ 12V触发输入：+ 12V触发输入允许您的前置放大器或配备12V触发输出的AV处理器将M22从“待机模式”远程切换至“开启”，反之亦然。
自动待机：如果大约30分钟没有活动的信号源输入，M22可以设置为自动进入待机模式。
保护模式：如果保护LED变为红色，则表示M22的保护电路已被占用。如果扬声器导线之一发生短路或发热过多，可能会发生这种情况。 |
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发表于 2018-2-22 22:52:14
