Stereocheck Reviews:

TEAC UD-505-X: Impressive DAC straight out of Japan

Teac UD-505-X is created on the basis of the year before last model UD-505, has the same design and form factor and is built in the same way according to the “dual mono” circuit with the...


Teac UD-505-X is created on the basis of the year before last model UD-505, has the same design and form factor and is built in the same way according to the “dual mono” circuit with the separation of the left and right channel circuits from the power supply to the output. Unlike its predecessor, the Teac UD-505-X is capable of receiving a PCM signal with a resolution of up to 32 bits/768 kHz and a DSD stream with a sampling rate of up to 22.5 MHz (that is, up to DSD512). The developers managed to achieve this, as well as improve the sound quality of the device, by using ES9038 Q2M converters, which are superior to the AK4497 chips used in the UD-505 in such parameters as dynamic range (131 dB versus 123) and Kg + noise (-116 dB versus -112 ).


Among other important differences between the Teac UD-505-X and its predecessor, we note that the new product has a dedicated balanced headphone output, implemented on a 4.4 mm Pentaconn connector, and a built-in Bluetooth receiver. The latter, by the way, supports the most advanced aptX™ HD and LDAC™ codecs.

Two clocks (clock generators) operate on signals that are multiples of 44.1 kHz and 48 kHz. An upgrade is available by connecting an external 10 MHz clock via a BNC port. On the rear side there are balanced and unbalanced outputs, an RCA analog input, as well as coaxial and optical inputs, a BNC for an external clock and a USB port for connecting to a computer, which features “Bulk Pet” technology. This technology has four modes and guarantees more stable and uniform data transfer between the computer and TEAC UD-505-X compared to the usual asynchronous method, which is especially important when broadcasting Hi-Res audio. As a result, the load on both devices is equalized, which has a positive effect on the sound quality.


The body of the device is reinforced with 8 mm aluminum sidewalls with rack handles and rests on three anti-vibration legs with conical spikes and thrust bearings. On the left side of its front panel there is a power switch, an LED diode indicating synchronization with an external clock, a 3.5 mm optical / coaxial input with support for PCM (24 bit / 192 kHz) and DSD (2.8 MHz) in DoP mode , input selector (also used in menu settings) and menu button.

The TEAC UD-505-X uses a balanced “dual mono” circuit topology using a separate toroidal power transformer in each channel. Thanks to the use of a digital isolator, noise from digital signal sources does not penetrate analog circuits. TEAC-HCLD technology is used: buffer high-current discrete amplifiers are installed in the analog stage, capable of providing a wide dynamic range. The TEAC UD-505-X DAC allows you to change the voltage at the linear output. To adjust the volume level, a 256-step control is used in 0.5 dB steps.

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The Class AB headphone amplifier has two 6.3mm jacks and a 4.4mm 5-pin Pentaconn balanced connector. A symmetrical connection uses active grounding, which suppresses noise generated by the power supply. HCLD technology is also used here. A balanced connection with active GDN is available to suppress noise generated by the power supply.

Characteristics of TEAC UD-505-X

DAC ES9038 Q2M (PCM up to 32 bit/768 kHz, DSD512 (22.5 MHz))
Upsampling switchable, RDOT-NEO technology, PCM: up to 32 bit/384 kHz or PCM in DSD (up to 24 .5 MHz
Filters PCM: Sharp Roll Off, Slow Roll Off, Short Delay Sharp, Short Delay Slow, Low Dispersion, filter off mode DSD: narrow, cutoff frequencies: 39 kHz (2.8 MHz), 78 kHz (5) .6 MHz), 156 kHz (11.2 MHz) or 312 kHz (22.5 MHz), wide, cutoff frequencies: 76 kHz (2.8 MHz), 152 kHz (5.6 MHz), 304 kHz (11 .2 MHz) or 608 kHz (22.5 MHz)
Frequency response 10 Hz – 80 kHz (+ 1 dB, – 3 dB, PCM 192 kHz, RCA output, digital filter disabled)
Signal-to-noise ratio more than 110 dB (PCM 192 kHz, RCA output, digital filter disabled)
Harmonic distortion 0.002% (PCM 192 kHz, RCA output, digital filter disabled)
Input impedance/input voltage 24 kΩ/130 mV (RCA line input)
Output impedance 188 Ω (XLR) , 150 Ω (RCA)
Output voltage XLR/RCA: 2 V (1 kHz, 10 kΩ, fixed, 0 dB), XLR/RCA: 4 V (1 kHz, 10 kΩ, fixed, +6 dB), XLR: 12 V (1 kHz, 10 kOhm, adjustable); RCA: 6 V (1 kHz, 10 kOhm, adjustable)
Headphone amplifier output power 2 x 700 mW (32 Ohm, balanced), 2 x 500 mW (unbalanced, 32 Ohm, one jack loaded), 2 x 350 mW (unbalanced connection, 32 Ohm, two connectors loaded), 2 x 500 mW (32 Ohm, active ground mode)
Bluetooth module version 4.0, supported profiles: A2DP, AVRCP, supported codecs: LDAC (sound quality is close to the PCM format 24 bit/96 kHz), Qualcomm aptX HD (close in sound quality to PCM 24 bit/48 kHz), aptX, AAC, SBC, number of simultaneously connected Bluetooth devices: 8
Inputs linear RCA, 3.5 mm coaxial/optical (24 bit/192 kHz, DSD 2.8 MHz, DoP), coaxial (24 bit/192 kHz, DSD 2.8 MHz, DoP), optical (24 bit/192 kHz, DSD 2.8 MHz, DoP), USB port (asynchronous mode, bulk mode (packet data transfer), type B, PCM up to 32 bit/768 kHz, DSD up to 22.5 MHz)
Outputs RCA line (fixed/variable), balanced XLR (fixed/variable) , 2 x 6.3mm headphone jacks (can be paired for balanced connection, 16-600 ohms), 1 x 4.4mm 5-pin Pentaconn balanced headphone jack (16-600 ohms)
Other switching gold-plated BNC- input for external 10 MHz clock generator TEAC CG-10M or others.
Power supply 2 toroidal transformers (one per channel)
OLED display, with 4-step brightness adjustment, switchable Remote
control RC-1330
Software player TEAC HR Audio Player (Windows, Macintosh), included, allows you to play Hi-Res audio in formats DSD512 and PCM (32 bit/768 kHz)
Power consumption 18 W, standby: 0.3 W
Dimensions (WxHxD) 290x85x249 mm
Weight 4.2 kg