Description
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. 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 analogue 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.
PREAMPLIFIER
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 formatsMP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS
High resolution audio formats MQA, FLAC, WAV, AIFF
Native sampling rates up to 32bit/384kHz
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 BluOS – 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 (802.11ac)
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)
PREAMPLIFIER
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 formatsMP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS
High resolution audio formats MQA, FLAC, WAV, AIFF
Native sampling rates up to 32bit/384kHz
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 BluOS – 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 (802.11ac)
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)
Used Frequently Asked Questions
- What does used mean? Used products may be unused customer returns that are essentially "new" items, or they may be previously installed products that were returned under warranty or during our return policy period.
- What is the warranty? All of our used items come with a 90-day warranty.
- What's it look like? All of our used items are inspected and graded by our returns team at our facilities. They will test them and grade them to one of four standard gradings: Used Open Box, Used Very Good, Used Good, and Used Acceptable. Please see the following descriptions of each grade - also note that if an item falls under ANY of the criteria for a certain grade, even though the rest of the product is better, we will give it the lowest grade.
- Used Open Box An item in perfect working condition. Original protective wrapping may be missing, but the original packaging is intact and in good condition with minor damage possible. Instructions are included.
- Used Very Good A well-cared-for item with limited use, remains in good working condition. The item may show some limited signs of wear,small scratches,cosmetic blemishes. Item may arrive with damaged packaging or be repackaged and could be missing some accessories.
- Used Good The item shows wear from use, remains in good condition and functions properly. May have damaged packaging or be repackaged. It may be marked, have identifying markings on it, have minor cosmetic damage. It may be missing some parts or accessories.
- Used Acceptable The item is fairly worn but continues to function properly. While repackaged; signs of wear can include aesthetic issues; scratches, dents. The item may have markings on it or show signs of previous use. Item may be missing some parts or accessories.
- Have more questions? Call us, send us a chat, or an email. We'll be able to answer any additional questions you may have.