M-Audio Transit Pro USB-Optical DSD Converter

The M-Audio Transit Pro is a high-resolution USB-to-optical and analog converter engineered for audiophiles and studio engineers who need a transparent digital bridge between a computer and a DAC or amplifier lacking native USB input. Its 384kHz PCM ceiling and DSD support cover every high-resolution audio format currently in consumer and professional distribution — there is no practical source file that will exceed this converter's input capability. The 112dB signal-to-noise ratio on the analog output and 0.003% THD+N represent a conversion stage that is, by all measurable criteria, sonically transparent — it introduces no noise floor contamination or harmonic signature that a listener or measurement system can attribute to the converter itself. Eight user-selectable sampling rates from 44.1kHz to 384kHz allow bit-perfect, non-upsampled conversion at every standard rate, preserving the integrity of native-rate masters.

In the signal chain, the Transit Pro occupies the role of a clean USB front-end: it receives the digital audio stream from the computer via USB and re-clocks and outputs it as optical S/PDIF (TOSLINK) for a downstream DAC, or as an analog signal for direct amplifier connection. This makes it the correct solution for DAC owners whose converter has an optical input but no USB port, or for engineers who want to isolate a high-quality outboard DAC from the noise environment of a computer's internal circuitry. It is a strictly stereo device — multichannel or surround workflows are outside its architecture. The absence of a coaxial S/PDIF output is its main connectivity limitation for users who prefer the lower-jitter characteristics of coax over TOSLINK at very long cable runs. Within its stereo, optical-output brief, however, it delivers measured performance that would have commanded a significantly higher price point even a decade ago.