The NAD C 658 is a new kind of stereo component, one that at once changes preconceptions and opens new possibilities for audio reproduction.

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 Qualcomm aptX HD Bluetooth 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 analogue components.

SPECIFICATIONS:

PREAMPLIFIER

LINE INPUT, PRE-OUT
THD (20Hz - 20kHz) Signal-to-Noise Ratio Channel separation
Input Impedance (R and C) Maximum input signal Output impedance
Input sensitivity
Frequency response
Maximum voltage output -IHF load Tone Controls
PHONO INPUT, AUDIO PRE-OUT
THD (20Hz - 20kHz) Signal-to-Noise Ratio
Input sensitivity
Frequency response Maximum input signal at 1kHz
LINE INPUT, HEADPHONE OUT
THD (20Hz - 20kHz) Signal-to-Noise Ratio Frequency response Channel separation Output impedance
DAC
Supported audio file formats High resolution audio formats Native sampling rates
Bit depths
BluOS
Supported operating systems
User interface mobile operating system Supported cloud services**
Free internet radio**
Bluetooth quality Bluetooth connectivity Network connectivity
DIMENSIONS AND WEIGHT
Dimensions (W x H x D)*** Shipping Weight
<0.005% at 2V out
>106dB (IHF; A-weighted, ref. 500mV out, unity gain)
>80dB (1kHz); >70dB (10kHz)
22 kohms + 100pF
>4.5Vrms (ref. 0.1% THD)
Source Z + 240 Ohm
93mV (ref. 500mV out, Volume maximum)
±0.3dB (20Hz - 20kHz)
>4.5V (ref. 0.1% THD)
Treble: ±7.0dB at 20kHz; Bass: ±7.0dB at 60Hz; Balance: -10dB
<0.01% at 2V out
>84dB (200 Ohm source; A-weighted, ref. 500mV out)
>76dB (MM cartridge source, IHF; A-weighted, ref. 500mV out)
1.44mV (ref. 500mV out, Volume maximum) ±0.3dB (20Hz - 20kHz)
>80mVrms (ref. 0.1% THD)
<0.005% at 1V out
>110dB (32 Ohms loads; A-WTD, ref. 2V out, unity gain) ±0.3dB (20Hz - 20kHz)
>60dB at 1kHz
6 Ohms
MP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS MQA, FLAC, WAV, AIFF
up to 32bit/384kHz
16 – 24
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
BluOS – Free Android and iOS App available online at Google Play and Apple App store
Spotify, Amazon Music, TIDAL, Deezer, Qobuz, HDTracks, HighResAudio, Murfie, JUKE, Napster, Slacker Radio, KKBox, Bugs
TuneIn Radio, iHeartRadio, Calm Radio, Radio Paradise
Bluetooth aptX HD wireless built-in Two-Way (Transmit and Receive)
Gigabit Ethernet RJ45 WiFi 5 (802.11ac)
435x100x405mm(171/8x315/16x16)” 10.1kg (22.3lb)