TEAC UD-507
The UD-507 is equipped with our proprietary “TRDD 5” discrete DAC, designed with musicality as the top priority. Following in the footsteps of TEAC's acclaimed 701 series, the new “TRDD 5” discrete DAC offers a clear soundstage and accurate imaging, providing listeners with a truly immersive musical experience.
Fully Balanced Dual Monaural Headphone Amplifier
UD-507The UD-507 is a headphone amplifier featuring the TEAC-HCLD2 high current line driver, which is characterized by its high current supply capability. Compared to the previous model, the maximum output power has been greatly improved by strengthening the power supply, resulting in a generous driving power of 1,200mW + 1,200mW (balanced output at 100 ohm load), which is comparable to a dedicated headphone amplifier without DAC.
The power amplifier gain can be switched between 3 positions (Low/Mid/High) to fine-tune the output to best match the sensitivity and impedance of the headphones.
Proprietary “TEAC Reference Discrete DAC: TRDD 5”
All digital signals input to the UD-507 are processed at 64bit/512Fs by the delta-sigma modulator in the FPGA, which incorporates a proprietary algorithm, and converted to analog signals by 16 elements per channel (one element is a pair of logic circuits and a low-pass filter with high-precision resistors). The DSD signal is processed directly, while the PCM signal is converted to a 1-bit signal by a delta-sigma modulator before being output as a high-quality analog signal. 22.5MHz DSD and 384kHz/32bit PCM playback is possible. Two operating methods can be selected according to your preference: the multilevel (multi-bit) delta-sigma method or the 1-bit delta-sigma method.
In Addition to 44.1kHz and 48kHz Internal Clocks, 10MHz External Clock Input Is Supported
For USB audio playback, the UD-507 supports the USB Asynchronous Transfer Method, which controls PCM and DSD data transfer by synchronizing to the clock generated by the UD-507’s internal high-precision crystal oscillator, instead of synchronizing to the unstable and noisy PC clock. The internal clock is equipped with two types of dedicated clocks, 44.1kHz and 48kHz series, each of which applies an audio-grade high-precision crystal oscillator with low phase noise to input signals at integer multiples, greatly minimizing the effect of jitter on sound quality and faithfully reproducing the original sound. The UD-507 also supports a 10MHz external clock input that can be synchronized to an external master clock signal. Synchronization with a high-precision external clock enables an upgrade to even higher quality music reproduction.
Preamplifier with Analog Volume Control – 4 Digital Inputs and 2 Line Inputs (RCA/XLR)
The UD-507 has two digital inputs each for coaxial and optical digital, as well as RCA and XLR analog inputs, allowing it to be used not only as a USB DAC, but also as a high-quality analog preamplifier.
The TEAC-QVCS (Quad Volume Control System), which uses a variable gain controller with four independent circuits for left, right, positive, and negative (L+, L–, R+, R–), is placed on the audio signal path to minimize the signal path and prevent audio signal degradation due to signal line routing. The TEAC-QVCS also provides fine volume control in 0.5dB increments, allowing you to set the volume level that best suits your audio system and headphones.
Up-Sampling Function
The up-sampling function uses RDOT-NEO (Refined Digital Output Technology NEO) to smoothly augment PCM digital audio signals and upconvert their sampling frequencies 2, 4 or 8 times (384kHz maximum). RDOT, which applies an analogous interpolation method using fluency logic, is a technology that was developed to enable reproduction and playback of frequencies higher than 20kHz that are lost by 44.1kHz/48kHz digital signals. Based on the information read, analogous data is generated between the waveform samples, which also results in data above 20kHz.
SPECIFICATIONS
| Supported formats | |
| USB input | |
| PCM | 16/24/32 bit 44.1k/48k/88.2k/96k/176.4k/192k/352.8k/384k Hz |
| DSD | 2.8M/5.6M/11.2M/22.5M Hz |
| Coaxial digital input | |
| PCM | 16/24 bit 32k/44.1k/48k/88.2k/96k/176.4k/192k Hz |
| DSD | 2.8MHz (supported with 176.4kHz/24-bit DoP format) |
| Optical digital input | |
| PCM | 16/24 bit 32k/44.1k/48k/88.2k/96k/176.4k/192k Hz |
| DSD | 2.8MHz (supported with 176.4kHz/24-bit DoP format) |
DAC section | |
| USB DAC | In-house designed Discrete DAC TRDD5 |
| Up-conversion | up to 384kHz/32-bit PCM |
| Audio inputs | |
| USB | USB Type-C port × 1 USB Type-B port × 1 |
| USB version | 2.0 |
| Transfer Mode | Asynchronous mode transfer, Bulk Pet |
| Compatible Software | TEAC HR Audio Player (Windows, Macintosh) |
| COAXIAL digital (rear) | RCA pin ×1 (gold-plated) |
| Input level | 0.5Vp-p |
| Input impedance | 75Ω |
| Optical digital (rear) | TOS-link ×1 |
| Input level | -24.0 to -14.5dBm peak |
| Analog (Balanced) | XLR ×1 pair (gold-plated) |
| Input impedance | 50kΩ |
| Input sensitivity | 5Vrms |
| Analog (Unbalanced) | RCA pin ×1 pair (gold-plated) |
| Input impedance | 24kΩ |
| Input sensitivity | 2.5Vrms |
Bluetooth® | |
| Bluetooth® version | 4.2 |
| Output class | Class2 (Range: approx. 33ft/10m) |
| Supported profiles | A2DP, AVRCP |
| Content protection | SCMS-T |
| Supported codec | LDAC™, LHDC, Qualcomm® aptX™ HD, aptX™, AAC, SBC |
| No. of paired device | maximum 8 devices |
| No. of multipoint connection device | maximum 2 devices |
Audio outputs | |
| XLR balanced | XLR ×1 pair (gold-plated) |
| Maximum output level | 1kHz, full scale, into 10kΩ |
| 0dB setting | 2.0Vrms |
| +6dB setting | 4.0Vrms |
| Output impedance | 40Ω |
| RCA unbalanced | RCA pin ×1 pair (gold-plated) |
| Maximum output leve | 1kHz, full scale, into 10kΩ |
| 0dB setting | 2.0Vrms |
| Output impedance | 20Ω |
Headphone outputs | |
| Connector 1 | 1/4” (6.3mm) TRS stereo jacks × 1 (gold-plated) |
| Connector 2 | XLR 4pin jack ×1 (gold-plated) |
| Connector 3 | 4.4mm 5-pole Pentaconn jack ×1 (gold-plated) |
Maximum output | |
| Balanced | 1200mW + 1200mW (into 100Ω) |
| Active Ground | 900mW + 900mW (into 32Ω) |
| Unbalanced | 900mW + 900mW (into 32Ω) |
| Supported impedances | 16 to 600Ω |
Clock section | |
| External clock input | |
| Connector | BNC (gold-plated) |
| Input frequency | 10MHz |
| Input impedance | 50Ω |
| Input level | Rectangle wave: equivalent to TTL levels Sine wave: 0.5 to 1.0 Vrms |
| Audio performance | 192kHz/24bit PCM input, RCA output, DAC mode MULTIBIT |
| Frequency Response | 5Hz to 70kHz (+1/–6 dB) |
| Total harmonic distortion | 0.01% or less (1kHz, LPF: 20Hz to 20kHz) |
| S/N ratio | 105dB or higher (A-weight, 1kHz) |
Power supply | |
| US/Canada | AC 120V 60Hz |
| UK/Europe | AC 220 to 240V 50Hz |
| Power consumption | 18W (0.4W in standby) |
| dimensions (including protrusions) | 290(W)×85(H)×249 (D) mm / 11.4”(W)×3.3”(H)×9.8”(D) |
| Weight | 4.9kg / 10.8lbs |
| Included accessories | Power cord, Remote control (RC-1334), AAA Batteries for remote control × 2, feet cushions × 3, Owner's Manual (with warranty) |