NAD C 658 + NAD C 298 Streaming DAC and Power Amplifier Package

C 658

BluOS Streaming DAC

The NAD C 658 is a new kind of stereo component, one that at once changes preconceptions and opens new possibilities for audio reproduction. You see, there has never before been a component offering such a rich palette of both new and proven technology. Bold statements? Read on.

NAD C 658是一种新型的立体声元件，它改变了人们的先入为主的观念，同时也为音频重现打开了新的可能性。你看，从来没有一款元件能提供如此丰富的新技术和成熟的技术。大胆的声明？请继续阅读。

Introducing the NAD C 658

Redefining the Architecture of Hi-Fi Playback

As we move deeper into the 21st Century the way music is distributed and enjoyed continues to evolve away from physical media to streaming. It also has moved away from analog to digital. The C 658 has incorporated these fundamental truths to create an entirely new type of component that combines a Network Streamer, a state-of-the art DAC, and many aspects of the traditional Preamplifier into a single highly cost effective package. And thanks to NAD’s exclusive Modular Design Construction, it will keep pace with the latest technology, not yet introduced, but inevitably coming in the future. In fact, an optional HDMI 4k switcher module is available now allowing the best sound from any of the many HDMI sources available (like game consoles and video STBs). While the C 658 immediately replaces (or adds) your Streamer, DAC, and Preamp, it also adds many new features you may not be aware of, like a Bluetooth aptX HD transmitter to use with your wireless headphones. The highly flexible outputs allow for a true balanced connection to powered speakers or amplifiers. Single-ended connections for amplifiers and subwoofers are also provided and include an adjustable subwoofer crossover executed perfectly in the digital domain. A highly sophisticated MM Phono input is also included along with line inputs for legacy analog components.

介绍NAD C 658

重新定义Hi-Fi播放的结构

随着我们深入到21世纪，音乐的传播和欣赏方式继续从物理媒体向流媒体发展。它也从模拟到了数字。C658将这些基本原理融入其中，创造了一种全新的组件，将网络流媒体、最先进的DAC和传统前置放大器的许多方面结合到一个高性价比的封装中。由于NAD独有的模块化设计结构，它将紧跟最新技术的步伐，虽然还没有推出，但未来不可避免地会出现。事实上，现在可选装的HDMI 4k切换器模块，可以从众多HDMI信号源（如游戏机、视频机顶盒等）中的任何一个HDMI信号源中获得最佳音效。虽然C 658可以立即取代（或增加）您的流媒体播放器、DAC和前置放大器，但它还增加了许多您可能不知道的新功能，如蓝牙aptX HD发射器，可与您的无线耳机一起使用。高度灵活的输出端允许与有源扬声器或功放进行真正的平衡连接。还提供了功放和超低音扬声器的单端连接，包括一个可调节的超低音分频器，在数字领域内完美地执行。还包括一个高度复杂的MM Phono输入，以及用于传统模拟元件的线路输入。

BluOS™ Enabled

Also on board is BluOS, the most sophisticated High Res streaming system available. BluOS natively supports over 15 streaming music services and indexing of over 250,000 tracks from local network sources. The C 658 becomes a node in the BluOS ecosystem allowing high res network streaming to 64 zones and control options for iOS, Android, Windows, and Mac OS phones, tablets, and desk top devices. BluOS also supports all major smart home controllers and is available in a wide range of products making it easy to create a whole house audio system with the C 658 at its heart.

BluOS™ 启用

同时，C658也是目前最先进的高解析度流媒体系统，支持超过15种流媒体音乐服务，并可从本地网络源中索引超过25万首曲目。C 658成为生态系统中的一个节点，可将高解析度网络流媒体传输到64个区域，并支持iOS、Android、Windows和Mac OS手机、平板电脑和桌面设备的控制选项。

Traditional NAD Performance and Value

The C 658 is part of our Classic Series of components which have an enviable reputation for giving Music Lovers more enjoyment for less money. If you want a solid block of hand–crafted aluminum with gold plated accents you’ll need to look elsewhere. If you want state-of-the-art performance and features in a sturdy no-nonsense package then you have the right address.

传统的NAD性能和价值

C658是我们的经典系列的一部分，它以较低的价格为音乐爱好者提供更多的享受，享有令人羡慕的声誉。如果你想要的是纯手工制作的铝材，再加上镀金装饰，那你就需要去别的地方看看了。如果你想要最先进的性能和功能，并在一个坚固的包装中获得最先进的性能和功能，那么你的地址是正确的。

High Resolution in Every Detail

Most NAD components have been High Res for 45 years with very wide bandwidth, low distortion, and ultra-low noise. We just never had High Res source material to play. With High Res digital recording and streaming, combined with advanced technology like MQA, record companies are opening their vaults and releasing Studio Master Quality recordings. MQA decoding is available through BluOS Streaming content. The C 658 is pure High Res from input to output and features the ESS Sabre 32bit DAC , one of the best performing DACs on the market today with its 118dB Dynamic Range and incredibly low jitter spec. All preamp functions are executed in the digital domain including the same wide range non-truncating digital volume control used in our Masters Series components. This offers an incredibly short analog signal path that, rather uniquely, is identical for all volume settings. Sophisticated active power supplies provide super clean voltages to all circuits to keep noise and distortion at the edge of measurability.

高分辨率的每一个细节

大部分NAD元件在45年的时间里都是High Res，带宽很宽，失真很低，噪音超低。只是我们从来没有High Res的音源素材可以发挥。有了High Res数字录音和流媒体，再加上MQA等先进的技术，唱片公司纷纷打开金库，发布Studio Master Quality录音。MQA解码可以通过流媒体内容来实现。C 658从输入到输出都是纯高阻值，采用ESS Sabre 32位DAC，是目前市场上性能最好的DAC之一，其118dB动态范围和难以置信的低抖动规格。所有的前置放大器功能都在数字域中执行，包括我们的系列元件中使用的宽范围非截断数字音量控制。这提供了一个非常短的模拟信号路径，在所有的音量设置中都是相同的。先进的有源电源为所有电路提供超级清洁的电压，将噪声和失真控制在可测量性的边缘。

Make the Speakers Disappear (It’s Not Magic)

The C 658 is also the first NAD stereo component to feature Dirac Live room correction*, the most sophisticated and effective room correction available. Dirac corrects the impulse response of your speakers, in addition to the frequency response of your room, for a truly transparent window into the musical performance. When the room resonances are tamed and the transient response is corrected, the result is magical. You have never heard your speakers sound this invisible or this good!

^{*Note: The C 658 includes a license for Dirac Live with the option for advanced users to upgrade to a Dirac Live Full Frequency version.}

让扬声器消失（这不是魔术

C 658也是NAD首款采用Dirac Live房间校正*的立体声组件，这是目前最复杂、最有效的房间校正功能。Dirac除了矫正扬声器的脉冲响应外，还能矫正房间的频率响应，为您提供一个真正透明的音乐表现窗口。当房间的共振被驯服，瞬态响应被修正后，结果是神奇的。您从来没有听过您的扬声器听起来如此无形，也没有听过如此好的声音!

^{*注：C658包含了Dirac Live授权，高级用户可选择升级到Dirac Live全频版。}

Master Quality Authenticated

Master Quality Authenticated (MQA) is a revolutionary end-to-end technology built into every BluOS Enabled amplifier to capture and deliver MQA music to your speakers in the purest quality. All BluOS Enabled players and systems include a powerful decoder and audio renderer for the millions of the MQA encoded songs, The MQA logo shown in the BluOS app indicates that the unit is decoding and playing an MQA stream or file, and lets you know that you are hearing exactly what the artist recorded and approved in the studio.

质量认证大师

Master Quality Authenticated (MQA)是一种革命性的端到端技术，内置于每一台Enabled功放中，以最纯正的质量捕捉并将MQA音乐传送到您的扬声器。所有Enabled的播放器和系统都包含了一个强大的解码器和音频渲染器，用于处理数以百万计的MQA编码歌曲。

C 298

Stereo Power Amplifier

Redefining the State of the Art with Purifi Technology

NAD has introduced some of the most innovative amplifier technology in its nearly 50 year history, starting with the 3020 on through such cutting edge models as the 2200, the 208, and the M2. Now we are making the amazing new Eigentakt™ (self-clocking) technology, recently introduced to the world in the EISA Award winning Masters M33, available to a wider audience with the very affordable C 298. We are thrilled to provide this unprecedented level of performance. In short, a perfect companion for the C 658 BluOS Streaming DAC pre-amp.

璞丽科技重新定义艺术状态。

在近50年的历史中，NAD推出了一些最具创新性的功放技术，从3020开始到2200、208和M2等尖端型号。现在，我们将最新的Eigentakt™(self-clocking)技术，以及最近在获得EISA奖的Masters M33中向世界介绍的技术，通过价格低廉的C 298提供给更多的用户。我们很高兴能够提供这种前所未有的性能水平。简而言之，是C 658BluOS 流式DAC前级放大器的完美伴侣。

Powerful. Efficient. Eigentakt™

Amazing Flexibility

The C 298 may be a basic Power Amp, but we have carefully thought through all the use cases typically encountered to create a rich feature content. Selectable balanced inputs make the C 298 a natural for studio use or connection to High End Preamps and Processors. These inputs include a trim control useful for matching to other components. A line out allows further addition of power on the same channel for additional speakers or subwoofers. Auto-sense with selectable threshold is perfect for automating complex systems or hiding the amp out of sight in a cabinet. We even include a Ground Lug that can be very useful for eliminating ground loops and noise in complex multi-unit systems. Added to all this connectivity is a Bridge Switch that turns the C 298 into an amazingly powerful Monobloc Amplifier. Start with one and add a second C 298 later when you upgrade your speakers.

强大的。高效。Eigentakt™

惊人的灵活性

C 298可能是一个基本的功率放大器，但我们仔细考虑了所有通常遇到的使用案例，创造了丰富的功能内容。可选择的平衡输入使C 298自然而然地成为工作室使用或连接到高端前级放大器和处理器。这些输入包括一个微调控制，对匹配其他组件非常有用。线路输出允许在同一通道上为额外的扬声器或低音炮进一步增加功率。可选择阈值的自动感应功能是复杂系统自动化或将放大器隐藏在箱体中的完美选择。我们甚至包括了一个接地环，这对于消除复杂的多单元系统中的接地环和噪音是非常有用的。除了这些连接性之外，我们还提供了一个桥接开关，可以将C 298变成一个功能强大的单体放大器。先用一个，以后升级音箱时再增加第二个C 298。

Getting the Basics Right

It is surprising how many seemingly advanced products in the market today often miss many of the most basic requirements for satisfying performance. Low noise circuits, accurate channel balance, proper input and output impedance characteristics, high overload margins and stability with difficult speaker loads. NAD starts by getting these things precisely right and advances from there. Our line inputs, both Balanced and Single-ended, can accommodate all kinds of analog source components by offering ideal input impedance characteristics with linear ultra-low-noise buffer amplifiers to prevent any sonic degradation caused by inappropriate loading of the source device. These are all details you can hear.

掌握基础知识

令人惊讶的是，目前市场上许多看似先进的产品，往往忽略了许多最基本的要求，无法满足性能。低噪声电路、准确的通道平衡、适当的输入和输出阻抗特性、高过载裕度以及在困难的扬声器负载下的稳定性。NAD从这些方面入手，准确无误地完成了任务，并在此基础上不断进步。我们的线路输入，包括平衡和单端输入，通过提供理想的输入阻抗特性，配合线性超低噪声缓冲放大器，可以适应各种模拟信号源元件，以防止因信号源设备负载不当而造成的任何音质下降。这些都是你能听到的细节。

Sophisticated Power

NAD has moved away from the old fashioned and very power hungry linear power supplies and Class AB output stages that waste nearly half of the energy consumed producing heat rather than sound. Instead we have developed even better performing circuits based on switch mode power supplies and Class D output stages. Once thought to be inferior to traditional topologies, NAD’s advanced work in this area has created some of the best performing amplifiers regardless of basic design principle. These new designs are very linear over a wide bandwidth and provide consistent performance into all speaker loads, providing a dramatic advance over previous models.

The generously dimensioned power supply easily allows for 185 watts continuous and over 570 watts instantaneous power for short term musical transients. Innovative Asymmetrical Power-Drive fully utilizes every last watt available with its vast reserves of dynamic power available to accurately reproduce musical transients without distortion or compression. It can operate with any AC mains voltage from 100v to 240v and provides pure DC power to all the various stages of the C 298. This highly efficient supply also provides near perfect regulation of voltage across a wide range of conditions and provides a solid noise-free foundation for the amplifying stages.

精密的电源

NAD已经摆脱了老式的、非常耗电的线性电源和AB类输出级，它们浪费了近一半的能量，产生热量而不是声音。取而代之的是，我们已经开发出基于开关模式电源和D类输出级的性能更好的电路。NAD在这一领域的先进工作一度被认为不如传统拓扑结构，但无论基本设计原理如何，都创造了一些性能最好的放大器。这些新的设计在宽广的带宽上非常线性，并为所有扬声器负载提供一致的性能，比以前的型号有了巨大的进步。

宽大的电源供应器可以轻松地提供185瓦的连续功率和超过570瓦的瞬时功率，用于短期的音乐瞬态。创新的不对称电源驱动充分利用了每一瓦特，其巨大的动态功率储备可以准确地重现音乐的瞬态，而不会失真或压缩。它可以在100v至240v的任何交流电源电压下工作，并为C 298的所有不同阶段提供纯直流电源。这种高效的电源还能在广泛的条件下提供近乎完美的电压调节，并为放大级提供坚实的无噪音基础。

Purifi ‘Eigentakt’ Amplifier Technology

Purifi is a Danish technology company that has brought together several of the industry’s leading engineers to apply advanced mathematical modelling to solve the last remaining limitations of audio amplifiers. While there are many good sounding amplifiers on the market today, Purifi has taken a fresh look at every aspect of amplifier performance and found many seemingly small non-linearities that can make a dramatic difference in the overall sound. This return to first principles has resulted in a stunningly simple approach to some remarkably complex problems. With features and technology unmatched by other amplifiers in its class, the C 298 amplifier is an easy upgrade for any system and a surprising partner for the most sophisticated and advanced loudspeakers on the market.

焙乐道"Eigentakt"放大器技术。

Purifi是一家丹麦的技术公司，它汇集了多位业内顶尖的工程师，运用先进的数学模型来解决音频功放最后剩下的局限性。虽然目前市场上有很多好听的功放，但Purifi从新审视了功放性能的方方面面，发现了很多看似微小的非线性，却能让整体声音产生巨大的变化。这种对第一原则的回归，使一些非常复杂的问题得到了惊人的简单处理。C 298功放拥有其他同级功放无法比拟的功能和技术，是任何系统的轻松升级，也是市场上最复杂、最先进的扬声器的惊人搭档。

Features

• 185W x 2 Rated Output Power into 8 Ohms
• 340W x 2 Rated Output Power into 4 Ohms
• Stereo Dynamic Power 260/490/570W @ 8/4/2 Ohms
• 620W x 1 Rated Output into 8 Ohms Bridge Mode
• Mono Dynamic Power 1000/1100W @ 8/4 Ohms
• Purifi Eigentakt™ Amplifier Technology
• Balanced Line Inputs
• Single-Ended Line Inputs
• Input Level Control
• Line Output for Daisy Chaining
• 12V Trigger In/Out
• Auto Turn-on with Selectable Threshold
• IR In/Out
• Ground Lug
• Detachable AC Power Cord

特点

• 185W x 2额定输出功率到8欧姆。
• 340W x 2额定输出功率到4欧姆。
• 立体声动态功率260/490/570W @ 8/4/2欧姆
• 620W x 1额定输出到8欧姆桥式模式。
• 单声道动态功率1000/1100W @ 8/4欧姆
• 净化器Eigentakt™放大器技术
• 平衡线路输入
• 单端线路输入
• 输入电平控制
• 用于菊花串联的线路输出
• 12V 触发器输入/输出
• 自动开启，阈值可选
• 红外线输入/输出
• 接地片
• 可拆式AC电源线

NAD C 658 
LINE INPUT, PRE-OUT
THD (20Hz – 20kHz)
<0.005% at 2V out
Signal-to-Noise Ratio
>106dB (IHF; A-weighted, ref. 500mV out, unity gain)
Channel separation
>80dB (1kHz)
>70dB (10kHz)
Input impedance (R and C)
22 kohms + 100pF
Maximum input signal
>4.5Vrms (ref. 0.1% THD)
Output impedance
Source Z + 240 Ohm
Input sensitivity
93mV (ref. 500mV out, Volume maximum)
Frequency response
±0.3dB (20Hz – 20kHz)
Maximum voltage output – IHF load
>4.5V (ref. 0.1% THD)
Tone Controls Treble
>±7.0dB at 20kHz; Bass: ±7.0dB at 60Hz; Balance: -10dB
PHONO INPUT, AUDIO PRE-OUT
THD (20Hz – 20kHz)
<0.01% at 2V out
Signal-to-Noise Ratio
>84dB (200 Ohm source; A-weighted, ref. 500mV out)
>76dB (MM cartridge source, IHF; A-weighted, ref. 500mV out)
Input sensitivity
1.44mV (ref. 500mV out, Volume maximum)
Frequency response
>±0.3dB (20Hz – 20kHz)
Maximum input signal at 1kHz
>80mVrms (ref. 0.1% THD)
LINE INPUT, HEADPHONE OUT
THD (20Hz – 20kHz)
<0.005% at 1V out
Signal-to-Noise Ratio
>110dB (32 Ohms loads; A-WTD, ref. 2V out, unity gain)
Frequency response
±0.3dB (20Hz – 20kHz)
Channel separation
>>60dB at 1kHz
Output impedance
6 Ohms
DAC
Supported audio file formats
MP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS
High resolution audio formats
MQA, FLAC, WAV, AIFF, Supports converted DSD playback via the BluOS desktop app (only)
Native sampling rates
up to 32bit/192kHz
Bit depths
16 – 24
BluOS
Supported operating systems
Plays music from network shares on the following desktop operating systems: Microsoft Windows XP, 2000, Vista, 7, 8 to current Windows Operating Systems and Mac OS X versions
User interface mobile operating system
luOS – Free Android and iOS App available online at Google Play and Apple App store
Supported cloud services
Spotify, Amazon Music, TIDAL, Deezer, Qobuz, HDTracks, HighResAudio, Murfie, JUKE, Napster, Slacker Radio, KKBox, Bugs
Free internet radio
TuneIn Radio, iHeartRadio, Calm Radio, Radio Paradise
Bluetooth quality
Bluetooth aptX HD wireless built-in
Bluetooth connectivity
Two-Way (Transmit and Receive)
Network connectivity
Gigabit Ethernet RJ45
WiFi 5 (802.11 ac/n)
DIMENSIONS AND WEIGHT
Dimensions (W x H x D)**
435 x 100 x 405mm (17 1/8 x 3 15/16 x 16)
Shipping Weight
10.1kg (22.3lb)

NAD C 298 
ANALOG AUDIO INPUT/LINE OUT
THD (20 Hz – 20 kHz)
<0.0005 % at 2V out
Signal-to-Noise Ratio
>120 dB (IHF; 20 Hz – 20 kHz, ref. 2V out)
Channel separation
>110 dB (1 kHz)
>100 dB (10 kHz)
Input impedance (R and C)
Single-ended: 56 kohms + 280 pF
Balanced: 56 kohms +280 pF
Maximum input signal
>7.0 Vrms (ref. 0.1 % THD)
Output impedance
390 ohms
Frequency response
±0.1 dB (20 Hz – 20 kHz)
Maximum voltage output -IHF load
≥>7.0 V (ref. 0.1 % THD)

ANALOG AUDIO INPUT/SPEAKER OUT
Rated output power into 8 Ohms and 4 ohms (Stereo mode, ref. 20 Hz-20 kHz at
rated THD, both channels driven)
185 W at 8 ohms
340 W at 4 ohms
Rated output power into 8 Ohms
(Bridge mode, ref. 20 Hz-20 kHz
at rated THD, both channels driven)
620 W at 8 ohms
THD (20 Hz – 20 kHz)
<0.005 % (1 W to 185 W, 8 ohms and 4 ohms)
Signal-to-Noise Ratio
>98 dB (A-weighted, 500 mV input, ref. 1 W out in 8 ohms)
>120 dB (A-weighted, ref. 185 W out in 8 ohms)
Clipping power (Stereo mode, at 1 kHz 0.1 % THD)
>200 W
Clipping power (Bridge mode, at 1 kHz 0.1 % THD)
>690 W
IHF dynamic power (Stereo mode, at 1 kHz 1 % THD)
8 ohms: 260 W
4 ohms: 490 W
2 ohms: 570 W
IHF dynamic power (Bridge mode, at 1 kHz 1 % THD)
8 ohms: 1000 W
4 ohms: 1100 W
Peak output current
>25 A (in 1 ohm, 1 ms)
Damping factor
>800 (ref. 8 ohms 20 Hz – 6.5 kHz)
Frequency response
±0.2 dB (20 Hz – 20 kHz)
-3 dB at 60 kHz
Channel separation
>100 dB (1 kHz)
>80 dB (10 kHz)
Stereo Mode input sensitivity (for 185 W in 8 ohms)
Fixed Gain mode: 1.43 V
Stereo Mode Gain
Fixed Gain mode: 28.6 dB
Line In – Balanced and Single-ended
Variable Gain mode: 8.5 dB – 28.5 dB
Bridge Mode Sensitivity
Fixed Gain mode: 3.78 V for 620 W in 8 ohms
Line In – Balanced and Single-ended
Variable Gain mode at maximum: 1.41 V for 620 W in 8 ohms
Bridge Mode Gain
Fixed Gain mode: 25.4 dB
Line In – Balanced and Single-ended
Variable Gain mode: 14.5 dB – 34.5 dB
Standby power
<0.5 W

DIMENSION AND WEIGHT
Gross dimensions (W x H x D)
435 x 120 x 390 mm (17 1/8 x 4 3/4 x 15 3/8 inches)
Net weight
11.2 kg (24.7 lbs)
Shipping weight
13.6 kg (30 lbs)