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. LINE INPUT, PRE-OUT THD (20Hz – 20kHz) 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) 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) 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 RJ45WiFi 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)
