TEAC UD-507
Dual mono DAC and headphone amplifier from TEAC, fitted with the discrete TRDD5 converter and XLR4, 6.35 mm and 4.4 mm Pentaconn outputs.
Description
The TEAC UD-507 is a headphone amplifier paired with a digital-to-analogue converter, designed to serve as the heart of a high-end headphone listening system. It can also function as an analogue preamplifier in combination with external equipment, thanks to its RCA and XLR inputs.
Its architecture is based on a dual mono configuration, with an in-house discrete-component DAC developed by TEAC (TRDD5 circuit) paired with a proprietary FPGA. The unit offers five digital inputs: two USB-B, two USB-C, a coaxial input, an optical input and Bluetooth with support for LDAC, LHDC, aptX HD, aptX, AAC and SBC codecs. A dedicated BNC input for a 10 MHz external master clock allows the unit to be synchronised to an external frequency reference. On the headphone output side, there is an XLR4 connector, a 6.35 mm jack and a 4.4 mm Pentaconn jack, with three gain levels (low, medium, high) to match the power delivered to the impedance of the headphones used, ranging from 16 to 600 Ohms. Power output reaches 1.2 watts at 100 Ohms via the balanced output and 900 mW at 32 Ohms via the unbalanced output, with a frequency response of 5 Hz to 70 kHz and a signal-to-noise ratio of 105 dB.
This model is aimed at audiophiles with demanding, current-hungry high-end headphones, as well as those wishing to centralise several digital and analogue sources around a single unit. The presence of an external clock input and multiple USB inputs also makes it a sound choice for a system already equipped with a dedicated digital source or an audiophile computer.
Technical specifications
| Headphone amplifier | Dual mono with integrated DAC, analogue preamplifier |
| DAC | Proprietary discrete-component circuit and proprietary FPGA (TRDD5) |
| Headphone outputs | XLR4, 6.35 mm, 4.4 mm Pentaconn |
| Gain settings | Low, medium, high |
| Digital inputs | USB-B, USB-C, optical, coaxial, Bluetooth (LDAC, LHDC, Qualcomm aptX HD, aptX, AAC, SBC), 10 MHz BNC (master clock) |
| Analogue inputs / outputs | RCA and XLR |
| Sampling rates (USB) | PCM 16 to 32 bit, 44.1 to 384 kHz, DSD 2.8 to 25 MHz |
| Sampling rates (coaxial) | PCM 16 to 24 bit, 44.1 to 192 kHz, DSD 2.8 MHz |
| Sampling rates (optical) | PCM 16 to 24 bit, 44.1 to 192 kHz, DSD 2.8 MHz |
| Balanced headphone output power | 1.2 W at 100 Ohms |
| Unbalanced headphone output power | 900 mW at 32 Ohms |
| Supported headphone impedances | 16 to 600 Ohms |
| Frequency response | 5 Hz to 70 kHz (+1/–6 dB) |
| THD | 0.01% (1 kHz, LPF: 20 Hz to 20 kHz) |
| Signal to noise ratio | 105 dB |
| Dimensions (H × W × D) | 85 mm × 290 mm × 249 mm |
| Weight | 4.9 kg |
What to check before buying used
The XLR4 connector and the 4.4 mm Pentaconn socket deserve careful checking: these are fragile contact points, prone to loose connections and wear after repeated insertions. Also check that the gain and input selectors hold firmly in place, and that there is no crackling on the volume potentiometers. Finally, test each digital input (USB, coaxial, optical, Bluetooth) to rule out any recognition fault linked to the FPGA or the proprietary DAC circuit.
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