Teac UD-501 DAC

The UD501 is a DAC utilising two burr-brown PCM1795 chips, and an output stage based on the MUSES8920 opamp. It features true 1-bit DSD support (unlike many modern DACs which convert to PCM internally) and also has an upsampler separate to the DAC chip itself, as well as the interesting option to bypass the DAC chip's internal oversampling filters (mostly) and run it in something akin to NOS on an R2R DAC. More on this later.
It also has some rather nice design aspects such as a dual-mono linear power supply to power the left and right channels independently. Not to mention a chassis build quality and aesthetic that still feels premium today.

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COAXIAL RCA jacks x 2 (0.5 Vp-p/75 ohms)
PCM data sampling frequency 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
bit rates 16/24-bit
OPTICAL Optical digital connectors x 2 (24.0 to 14.5 dBm peak)
PCM data sampling frequency 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, bit rates 16/24-bit
USB Type B connector x 1 (USB 2.0 compliant)
PCM data
sampling frequency 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz, 384 kHz
bit rates 16/24/32-bit
DSD data
sampling frequency 2.8/5.6MHz
Analog audio outputs
XLR XLR jacks x 1 pair
Output impedance 88 ohms
Maximum output level 4.0Vrms (1/full-scale, into 10 kohm)
Frequency range 5Hz - 80kHz (-3dB)
S/N ratio 115dB
Distortion 0.0015% (1kHz)
RCA RCA jacks x 1 pair
Output impedance 22 ohms
Maximum output level 2.0Vrms (1/full-scale, into 10 kohm)
Frequency range 5Hz - 80kHz (-3dB)
S/N ratio 115dB
Distortion 0.0015% (1kHz)
Headphones output
Connector Standard 6.3 mm stereo jack
Maximum output 100 mW + 100 mW (into 32 ohms)
Power supply AC 120 V, 60 Hz
Power consumption Max 13W (Auto power save standby mode: 0.1W)
Overall Dimensions 290 (W) x 81.2 (H) x 244 (D) mm,
11.4" (W) x 3.2" (H) x 9.6" (D)
Net Weight 4.0kg (8 15/16 lb)