For the DAC chip, a 32-bit compatible PCM1795(manufactured by Texas Instruments Incorporated) adopted is internally up-convertible to 352.8k/384kHz/32-bit.The USB input is compatible up to 192kHz/32-bit PCM data and DSD data (2.82M, 5.64MHz) whilst the S/PDIF input supports up to 192kHz/24-bit PCM signals. A variety of digital inputs (a coaxial input and 2 optical inputs) are provided as well as the USB input to connect to the digital output of a CD player and other peripheral AV devices. A selectable 32-bit digital filter for PCM and a selectable analog FIR filter for DSD allow the tone to be adjusted to taste. Low phase noise clock modules with high precision and low jitter are fitted independently on both the 44.1k and 48kHz channels to reduce noise. A remarkably reduced jitter for the USB input is achieved by asynchronous communication for the S/PDIF using an embedded DAIR high precision clock.
The structure of the DAC + pre-amp + headphone amp inherited from the DA-200 has been greatly improved both in terms of the sound quality and functionality. 6 integrated circuited LECUAs are arranged independently in both the headphone and line outputs in order to completely eliminate level deviation at low sound volumes. For both the balanced and unbalanced line outputs, the output signal can be selected between FIX and VARIABLE. When VARIABLE is selected, the system can be connected directly to a power amplifier or active speakers. The drive force of the headphone output has been significantly improved with the addition of a discrete buffer circuit. A sensitivity selector has also been added. All line outputs feature an independent buffer circuit to prevent changes in sound quality when the outputs are used simultaneously. In addition, 1 line of analog input is available. A high-inertia power supply system consists of a large-capacity transformer, an independent regulator for each circuit and large-capacity block condensers.
A highly visible 2-stage, 7-segment LED with a dimmer function is mounted on the stylish front panel with a blaster white finish. The DA-250 also features an output phase selection switch that is useful for connecting with other companies’ balanced devices. A compact, card style remote control is provided enabling full control from the listening position. Gold plated 18mm pitch RCA jacks and high grade XLR terminals manufactured by Neutrik® are mounted on the rear panel to allow high-quality, high performance cables to be used. The original LUXMAN high sound quality playback software ‘LUXMAN Audio Player’ is also available, supporting a wide variety of formats such as DSF and FLAC whilst offering a simple operation solution.