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Behind the expressiveness of the UD-503, which exceeds the level expected of its class, is an indulgent dual-monaural circuit structure that encompasses every aspect from the power and D/A sections to the analog output stage. The organic electroluminescent display (OELD) with a 4-level dimmer provides high contrast and excellent visibility. A large font is used to enable listeners to check the volume even from distant positions.
Dual-monaural structure supports fully-balanced transmission and realizes further advancement
Four types of PCM digital filter and two types of DSD filter
Isolation circuit that completely separates the grounding of the digital and analog sections
Preamp circuits use TEAC-QVCS high-precision volume control with a four-circuit structure
Volume display using OELD has excellent visibility
Headphone amplifier with discrete construction supports balanced drive headphones
The full-metal body realizes both vibration control and elegant style in an A4-size body that enables placement on a desktop
Symmetrically placed XLR output and RCA input and output jacks
Three supportive pinpoint feet allow easy installation
2 x headphones ( phone stereo 6.3 mm ) - front 1 x audio line-in ( RCA x 2 ) - rear 1 x audio line-out ( RCA x 2 ) - rear 1 x balanced audio output ( XLR x 2 ) - rear 1 x USB ( 4 pin USB Type B ) - rear 1 x digital audio input (coaxial) ( RCA ) - rear 1 x digital audio input (optical) ( TOSLINK ) - rear 1 x sync input ( BNC ) - rear 1 x SPDIF input ( mini-phone stereo 3.5 mm / optical ) - front