The UD-505 is a dual monaural USB DAC with an integrated fully-balanced headphone amplifier, that fuses high-end audio design concepts and TEAC’s decades of audio design experience, in an A4-sized footprint.

Like its predecessor models, the UD-501 and UD-503, it employs a dual monaural circuit design to process audio signals with even greater purity, with the latest VERITA AK 4497 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 DSD 512 ( 22.5M Hz ) native and 768k Hz / 32-bit PCM playback capabilities.

The analogue section, which is one of the keys to sound quality, includes four TEAC-HCLD buffer amp circuits process different drive modes, – fully-balanced drive for balanced output, and parallel drive mode for unbalance output, – to achieve enhanced acoustic expressive.

The headphone section is remarkable. A totally new 4.4 mm headphone jack, called Pentaconn, is employed, allowing balanced and active ground connections within a single jack, while conventional 1/4” phone jacks are also provided. In addition to a wide range of digital and analogue inputs, a Bluetooth® receiver supporting LDAC™ and Qualcomm® aptX HD™ allows you to enjoy high-quality wireless audio streaming from your smartphone on this flagship USB DAC.

The UD-505 is a compact and high-spec USB DAC and headphone amplifier that supports today’s high sampling rate Hi-Res formats.

TEAC UD-505 DAC User's Manual

Specifications

Supported Formats

USB input

PCM 16 / 24 / 32-bit, 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384 / 705.6 / 768k Hz

DSD 2.8 / 5.6 / 11.2 / 22.5M Hz

Coaxial Digital Input

PCM 16 / 24-bit, 32 / 44.1 / 48 /88.2 /96 / 176.4 / 192k Hz

DSD 2.8M Hz ( supported with 176.4k Hz / 24-bit DoP format )

Optical Digital Input

PCM 16 / 24-bit, 32 / 44.1 / 48 / 88.2 / 96 / 176.4 / 192k Hz

DSD 2.8M Hz ( supported with 176.4k Hz / 24-bit DoP format )

DAC Section

USB DAC Asahi Kasei Microdevices AK 4497 × 2

Up-conversion up to 384k Hz / 32-bit PCM, 22.5M Hz DSD

Digital Filters

PCM filters Sharp Roll Off, Slow Roll Off, Short Delay Sharp, Short Delay Slow, Low Dispersion, off

DSD cutoff frequencies narrow: 39k Hz ( at 2.8M ), 78k Hz ( at 5.6M ), 156k Hz ( at 11.2M ) or 312k Hz ( at 22.5M )

Wide: 76k Hz ( at 2.8M ), 152k Hz ( at 5.6M ), 304k Hz ( at 11.2M ) or 608k Hz ( at 22.5M )

Audio Inputs

USB USB B port, USB 2.0, asynchronous mode transfer, bulk transfer

Compatible Software TEAC HR Audio Player ( Windows, McIntosh )

COAXIAL digital ( rear ) RCA pin × 1 ( gold-plated )

Input level 0.5 Vp-p

Input impedance 75 Ω

Optical digital ( rear ) TOS-link × 1

Input level −24.0 dBm to −14.5 dBm peak

Coaxial digital ( front ) 1/8” ( 3.5 mm ) mini* × 1 ( combined with optical digital input, detected automatically )

Input level 0.5 Vp-p

Input impedance 75 Ω

* 1/8” Mini - RCA conversion cable included.

Optical digital ( front ) 1/8” Mini Optical* × 1 combined with coaxial digital input, detected automatically 

Input level −24.0 dBm to −14.5 dBm peak

Analogue ( rear ) RCA pin × 1 pair ( gold-plated )

Input impedance 24k Ω

Input sensitivity 130 mV

BluetoothR

BluetoothR version 4.0

Output class Class 2 ( Range: approx. 33ft / 10m )

Supported profiles A2DP, AVRCP

Content protection SCMS-T

Supported codec LDAC™, QualcommR aptX™ HD, aptX™, AAC, SBC

Audio Outputs

XLR balanced XLR × 1 pair ( gold-plated )

Output level Fixed ( 0 dB ), fixed ( +6 dB ), variable, output off ( selectable )

Maximum output level 2.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to fixed ( 0 dB )

4.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to fixed ( +6 dB )

12.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to variable )

Output impedance 188 Ω

RCA unbalanced RCA pin × 1 pair ( gold-plated )

Output level Fixed ( 0 dB ), fixed ( +6 dB ), variable, output off ( selectable )

Maximum output level 2.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to fixed ( 0 dB )

4.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to fixed ( +6 dB )

6.0 Vrms ( 1k Hz, full scale, into 10k Ω, when set to variable )

Output impedance 150 Ω

Headphone Outputs

Connector 1 1/4” ( 6.3 mm ) TRS stereo jacks × 2 ( gold-plated )

Polarity ( balanced ) Tip: HOT, Ring: COLD, Sleeve: cC ( GcD )

Polarity ( unbalanced ) Tip: L, Ring: R, Sleeve: GcD

Connector 2 4.4mm 5-pole Pentaconn × 1 ( gold-plated )

Polarity ( balanced ) Tip: L+, Ring 1: L–, Ring 2: R+, Ring 3: R–, Sleeve: GcD

Maximum Output

Balanced 700 mW + 700 mW ( into 32 Ω )

Unbalanced 500 mW + 500 mW ( into 32 Ω × 1 )

350 mW + 350 mW ( into 32 Ω × 2 )

Active ground 500 mW + 500 mW ( into 32 Ω )

Supported impedances 16–600 Ω

Clock Section

Internal clock

Type Crystal oscillator

Number of clocks 2 ( 44.1k Hz and 48k Hz )

External clock input

Connectors: BcC ( gold-plated )

Input frequency: 10M Hz

Input impedance: 50 Ω

Sine wave: 0.5 to 1.0 Vrms

Audio Performance

Frequency Response 10 Hz – 80,000 Hz ( +1/–3 dB, 192k Hz PCM input, RCA output )

Total harmonic distortion: 0.002% or less ( 192k Hz PCM input, RCA output, digital filter off )

S/N Ratio: 110 dB or higher ( 192k Hz PCM input, RCA output, digital filter off )

Operating Systems

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 Consumption: 18 watt ( 0.3 watt in standby )

Overall Dimensions: 11.4” x 3.3” x 9.8”  ( W x H x D, including protrusions )

Net Weight: 9.3 lbs

Included Accessories

Power cord, RCA mini plug adapter cable, remote control ( RC-1330 ),

2 AAA batteries for remote control, 3 feet cushions, Owner's Manual & Warranty

Shipping Weight & Dimensions: 12.2 lbs 17" x 13.5" x 7.5"