● Dual monaural circuit design with a high-end AKM VERITA AK4497 DAC on each channel
● Supports MQA decoder and music subscription services (TIDAL and Qobuz) and is Roon-ready
● DSD128 (5.6MHz) and PCM 192kHz/24-bit Network streaming from NAS/PC
● 5 types of PCM digital filters and 2 types of DSD digital filters
● Up-conversion up to 24.5MHz DSD and 384kHz/32-bit PCM
● Dual on-board clocks for 44.1kHz and 48kHz frequencies, and 10MHz external clock input
● Bluetooth® receiver supporting LDAC™ and Qualcomm® aptX™ HD
● TEAC-HCLD output buffer circuit and TEAC-QVCS volume control for high quality sound
● “Bulk Pet” USB transfer technology, with four transfer modes to vary sound character *1
● Free TEAC HR Audio Player and TEAC HR Streamer app
*1 "Bulk Pet" is a registered trademark of Interface Corporation.
Brand TEAC
Series Reference 505
Model NT-505-B NT-505-S
Color Black Silver
UPC Code 043774 033348 043774033355
EAN Code 4907034 221806 4907034 221813
Date of Launch February, 2018 March, 2018
Estimated Market Price JPY168,000 (tax excluded)
Product Dimensions
(W x H x D) / NW
Package Dimensions
(W x H x D) / GW
Qty. per Master Carton 1
290 × 81.2 × 248.7 mm / 11.4” x 3.2” x 9.8”
3.9 kg / 8.6 lbs.
440 × 190 × 340 mm / 17.3” x 7.5” x 13.4”
5.3 kg / 11.7 lbs.
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■ Product overview
The NT-505 is a flagship dual monaural USB DAC with versatile network playback capabilities. It
successfully incorporates the latest network technologies, along with TEAC’s decades of
accumulated audio design experience, in an attractive package with an A4-sized footprint.
Like its predecessor (the NT-503) it employs a dual monaural circuit design to process audio
signals with even greater purity, with the latest VERITA AK4497 DAC chip used on each of the
two channels. This improves the S/N (signal to noise) ratio by processing each channel
individually in monaural mode, as well as delivering DSD512 (22.5MHz) native and 768kHz/32-bit
PCM playback capabilities.
The analogue section, which is one of the keys to sound quality, includes four TEAC-HCLD buffer
amp circuits that allow different drive modes, – fully-balanced drive for balanced output, and
parallel drive mode for unbalanced output – to achieve enhanced acoustic expression.
On the network audio side, the NT-505 supports high-quality music subscription services, namely
TIDAL and Qobuz, and is Roon Ready. There’s also a built-in MQA decoder, and you will enjoy
unlimited music content on the Internet thanks to its high-quality digital and analogue processing
technologies.
In addition to a wide range of digital and analogue inputs, a Bluetooth® receiver supporting
LDAC™ and Qualcomm® aptX HD™ allows you to stream high-quality audio wirelessly from your
smartphone to this flagship USB DAC.
The NT-505 is a compact and high-spec USB DAC and network player that supports the latest HiRes formats and online music subscription services.
For the ultimate digital-to-analogue performance
● High-performance VERITA AK4497 DACs supporting DSD512 and PCM32/768
The NT-505 employs the latest VERITA AK4497 (developed by Asahi Kasei Microdevices) on each
of the left and right channels. It is a highly-regarded high-end audio DAC, and supports DSD512
(22.5MHz) and 768kHz/32-bit PCM formats, achieving industry-leading ultra low distortion levels.
OSRD (Over-sampling Ratio Doubler) technology, meanwhile, significantly reduces out-of-band
noise. As a result, the NT-505 has the refinement necessary to make the most of Hi-Res formats,
successfully processing information that lies outside the audible range.
* The AK4497 is the flagship product of the Asahi Kasei Microdevices Audio4pro™ family, which has been developed for
professional audio equipment and high-end digital audio.
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● Dual monaural circuit design and fully-balanced design
A dual monaural circuit configuration is used throughout, from the power supply (including power
transformers), to the D/A converters in the digital section and the analogue output stage. From
the high-performance VERITA AK4497 D/A converters to the massive toroidal-core power
transformers, each element is configured for single channel processing. This prevents mutual
interference effects while reproducing a rich acoustic expressiveness.
In addition, the analogue audio signals of both the left and right channels are processed in full
balanced mode soon after the D/A converters all the way to the output terminal, contributing to
an improved S/N ratio and extended dynamic range. This allows the fantastic sense of air that HiRes formats possess to be processed and conveyed without any losses.
● Supports TIDAL and Qobuz music subscription services, and is Roon Ready
Connecting to your home network via a LAN cable, the NT-505 allows you to access Hi-Res music
libraries on available music servers and computers, as well as hundreds of millions of CD-quality
tracks on Internet via music subscription services like TIDAL and Qobuz.
The NT-505 is also a Roon Ready product that enables Hi-Res audio streaming thanks to its highperformance D/A converters.
*Roon Ready is scheduled to be deployed in the near future.
● MQA decoder for master quality streaming
In order to achieve an analogue waveform closer to the original signal, the NT-505 supports MQA
decoding while also supporting high sampling rate Hi-Res formats like DSD512 and PCM32/768. The
MQA decoder is a totally new technology that controls analogue waveforms with excellent precision
(as fine as 5 microseconds) and it reproduces sound in a manner that is perceived to be as close as
possible to the original (to human hearing).
Furthermore, a high-efficiency compression algorithm makes huge Hi-Res audio files compact in size,
so you will be able to enjoy Hi-Res audio sources regardless of the speed of your Internet connection.
※
*MQA Ready is scheduled to be deployed in the near future.
● High-quality wireless audio streaming via Bluetooth®
In addition to conventional SBC and AAC codecs, the NT-505 also supports LDAC™ (24/96 Hi-Res
audio transmission), and Qualcomm® aptX™ HD, a codec that uses 24/48 format transmission.
These allow you to playback playlists on your smartphone and tablet wirelessly.
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● Hi-Res audio playback from USB flash drive
The USB port on the front panel allows you to playback Hi-Res audio formats including DSD128
(5.6MHz) and PCM 24/192.
● Dual onboard clocks for 44.1k and 48kHz, and an external clock input
Instead of referencing to an unstable and noisy PC clock during USB audio
playback, a more accurate and on-board clock is generated by a high-precision,
low phase-noise, audio-grade crystal oscillator for USB asynchronous transfer
mode. The NT-505 accommodates two on-board clocks exclusively for 44.1kHz
and 48kHz sampling frequencies and applies the appropriate one to incoming digital signals –
those that are multiples of 44.1k or 48k – to reproduce identical sound to the original by
eliminating jitter effects on the audio signal.
In addition, an external 10MHz clock input is also provided, to synchronise with an even higherprecision master clock generator, such as the TEAC CG-10M, for yet further upgraded audio
playback with excellent sound quality.
● Up-conversion up to 384kHz/32-bit PCM and 24.5MHz DSD
Employing RDOT-NEO (Refined Digital Output Technology NEO), a fluency algorithm that renders
digital audio signals smoothly, the NT-505 up-converts PCM digital signals up to 384kHz/32-bit
PCM and 24.5MHz DSD. With the up-conversion function activated, you will hear an improvement
in quality, even with music that you are familiar with.
● “Bulk Pet” USB transfer technology for enhanced audio quality
When transferring large volumes of digital data for Hi-Res audio sources through USB cables
using conventional isochronous transfer mode, large variations can occur in the processing loads
of the sending computer and the receiving USB DAC. This can cause sound to drop out and other
problems to occur.
However, with our new USB transmission technology – dubbed "Bulk Pet” - a fixed amount of
data is transmitted constantly, levelling out the processing burden on both devices and
contributing to stable data transmission. Changing the
processing burden on the computer directly affects audio quality so users can select the setting
they prefer (from four transmission modes).
*"Bulk Pet" is a registered trademark of Interface Corporation.
For more information about "Bulk Pet," please visit the Interface Corporation website.
https://www.itf.co.jp/prod/audio_solution/bulk-pet
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● More digital filters than previous model
On the NT-505, there are two types of DSD filters and another five types of PCM digital filters,
allowing you to apply the filter that best matches the file format or type of music you’re listening
to. The filter can be changed at the touch of a button on the remote control, allowing you to
enjoy the different sonic nuances of each filter.
PCM digital filters
• Sharp Roll Off: FIR filter with a steep roll-off that sharply cuts signals outside the audio band
• Slow Roll Off: FIR filter with a slow roll-off that gently cuts signals outside the audio band
• Short Delay - Sharp: Short delay filter with a steep roll-off that sharply cuts signals outside the audio band
• Short Delay - Slow: Short delay filter with a slow roll-off that gently cuts signals outside the audio band
• Low Dispersion: Short delay filter with low dispersion that cuts signals outside the audio band.
• Off
*When receiving signals at 352.8 kHz, 384 kHz or higher, the digital filter will be disabled during processing
regardless of the above setting.
DSD digital filter
• Narrow: Cut-off frequency of 39kHz (at 2.8M), 78kHz (at 5.6M), 156kHz (at 11.2M) or 312kHz (at 22.5M)
• Wide: Cut-off frequency of 76kHz (at 2.8M), 152kHz (at 5.6M), 304kHz (at 11.2M) or 608kHz (at 22.5M)
● Isolated digital and analogue sections
In order to suppress interference between the digital and analogue sections, the NT-505 employs
an independent power supply and ground circuit, so eliminating cross-interference in the signal
path where digital and analogue sections connect. A digital isolator is employed at the input
section to eliminate noise originating from any connected digital sources, including noise that is
generated from the computer via USB, power line and the ground path. This isolation circuit also
makes a significant improvement in the signal-to-noise ratio as well as the final sound quality.
● Dual high-capacity toroidal-core power transformers
The dual monaural theme continues. Two over-sized high-capacity toroidalcore power transformers are employed in the NT-505, supplying stable,
individual current sources for each of the left and right channels. This means
neither channel will be affected by changes in the power consumption of the
other during digital processing.
Further enhanced analogue output circuitry
● Unique TEAC-HCLD output buffer amp circuits
At the heart of analogue section are TEAC-HCLD (High Current Line
Driver) buffer amp circuits, designed to enhance current supply.
Each channel employs two identical buffer amps that process
differential drive for balanced output, and parallel drive for
unbalanced output. By increasing the current supply to the buffer
amp section, the analogue audio signal is passed to the next step
without any loss of dynamism.
● TEAC-QVCS high-precision volume control with four circuits
The NT-505 is also a superb pre-amplifier, thanks to its combination of outstanding analogue
processing performance, a wide range of analogue/digital inputs, and fixed/variable level XLR
(balanced) and RCA (unbalanced) outputs. These allow you to build a fully-fledged hi-fi system
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around the NT-505 with a stereo amplifier/pair of monaural power amplifiers and floorstanding
speakers, or a simplified system based on a pair of active speakers
The TEAC-QVCS (Quad Volume Control System) is a precise volume
control design incorporated in the pre-amp section. This circuit employs
four sets of variable gain-amps controlling volume for left, right, positive
and negative (L+, L–, R+, R-). Each variable gain-amp is located on a
simplified signal path which helps eliminate interference noise by creating
a shorter signal path.
In addition, the TEAC-QVCS provides precise volume control in 0.5dB steps in ‘dB’ display mode,
or 100 steps in ‘step’ display mode.
● Ground-separate headphone drive mode
Applying TEAC-HCLD (which comprises four output transistors in each of the left and right channels)
for headphone amplification delivers an excellent sound quality via the conventional 1/4” stereo TRS
jack. Furthermore, by driving these transistors in parallel when a single-ended headphone is
connected, stronger driving power than conventional single-ended headphone amps provide can be
delivered to the headphones. In conventional headphone listening, it is configured to operate in
Class-A, despite nominally being a Class-AB amplifier.
The NT-505 allows you to bring out the potential of any type of headphones including 600Ω highimpedance examples.
Moreover, the ground-separate drive mode completely separates the grounds of the left and right
channels from the amp section to the output jacks. Channel separation, which is crucial for
headphone listening is significantly improved, achieving a clear soundstage with good transparency.
● Full-dot OLED display with excellent visibility
A high contrast full-dot OLED (organic EL display) with 4-step dimmer is employed, for excellent
visibility. Even better, a highly legible, large font size allows you to easily verify the volume level,
input source and other information, even when sat at a distance.
Obsessively well-designed
● Full-metal body for functionality and beauty
Just as with the successful Reference 503 series, the NT-505 employs aluminum-alloy panels including iconic side guard-bars - and a robust metal chassis with a compact A4-size footprint*
that completely matches with the 500 series and the new CG-10M master clock generator. The
full metal construction isn’t just beautiful, it’s also functional. It’s highly effective at isolating the
internal circuits from electromagnetic noise.
*Not including connectors, knobs and other protruding parts.
● Symmetrically laid out XLR and RCA output jacks
The NT-505 is equipped with both balanced and unbalanced analogue audio outputs. A pair of
XLR connectors and another pair of RCA connectors – each gold-plated – are symmetrically laid
out, hinting at the dual monaural arrangement inside, and allowing a wide range of possible audio
configurations. A wide-spaced pitch layout for the RCA outputs accommodates professional grade
plugs with large-diameter shells. The NT-505 has a total of 5 digital inputs: USB audio, coaxial,
optical on the rear panel, and a combination jack on the front panel (for coaxial and optical,
supporting PCM 24/192 and DSD64 in DoP format).
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● Free TEAC HR Audio Player software for DSD512 playback on both Windows and Mac
The next-generation Hi-Res formats, DSD512 (22.5MHz) and PCM 768kHz/32-bit are supported
via the TEAC HR Audio Player software for Windows and Mac. This software guarantees the best
available playback quality with any combination of audio format and computer configuration via a
single USB cable. All the user has to do is choose the NT-505 from the pull-down menu showing
target output devices. The TEAC HR Audio Player is downloadable from TEAC’s web site, and is
completely free to use.
* Use on a Windows computer requires a free driver, also provided by TEAC.
● Free TEAC HR Streamer app for iOS/Android devices
Supporting Hi-Res audio formats up to 5.6MHz DSD and 192kHz PCM, this free app for iOS and
Android devices allows you to control wireless streaming music playback from a device, NAS,
computers and the Internet, along with rich graphic information such as album artwork.
* iOS version is available now. Android version is scheduled for later release.
* Wi-Fi network is required to use the App.
Clock section
Internal clock Type Crystal oscillator
Number of clocks 2 (44.1kHz and 48kHz)
External clock input Connector BNC (gold-plated)
Input frequency 10 MHz
Input impedance 50 Ω
Input level Rectangle wave: equivalent to TTL levels
Sine wave: 0.5 to 1.0 Vrms
Audio performance
Frequency Response 10 Hz – 80,000 Hz (+1/–3 dB, 192kHz PCM input, RCA output, digital filter off)
Total harmonic distortion 0.002% or less (192kHz PCM input, RCA output, digital filter off)
S/N ratio 110 dB or higher (192kHz PCM input, RCA output, digital filter off)
Operating systems
Windows Windows 10
Windows 8.1 (32-bit, 64-bit)
Windows 8 (32-bit, 64-bit)
Windows 7 (32-bit, 64-bit)
Macintosh High Sierra (macOS 10.13)
Sierra (macOS 10.12)
El Capitan (OS X 10.11)
Yosemite (OS X 10.10)
Mavericks (OS X 10.9)
Mountain Lion (OS X 10.8)
Lion (OS X 10.7)
General
Power supply AC 120V 60Hz (US/Canada), AC 220-240V 50Hz (UK/Europe)
Power consumption 20 W (0.4 W in standby)
Overall dimensions 290 × 81.2 × 248.7 mm / 11.4” x 3.2” x 9.8”
(W x H x D, including protrusions)
Weight 3.9 kg / 8.6 lbs.
Included accessories Power cord, RCA mini plug adapter cable, remote control (RC-1330),
2 AAA batteries for remote control, Owner's Manual (with warranty)