"Apogee PSX-100 in v.g.c. and in full working order. Although discontinued these units are 24bit 96khz and will sound better than any other unit in this price range. Below is some technical spec: For more than a decade, Apogee Electronics has been a pioneer in digital audio technology, releasing numerous products such as state-of-the-art digital filters, format converters and, more recently, conversion systems. The recently introduced PSX-100 functions as a complete 2-channel high-density conversion system and capitalizes on the industrys migration toward a 24-bit/96kHz audio standard. Housed in a 1U rackmountable enclosure, the unit provides stereo 24-bit/96kHz analog to digital conversion, plus stereo 24-bit digital to analog conversion. The PSX-100 also functions as a bit-splitter and format converter. Incorporating Apogees proprietary UV22 word length reduction technology, the PSX-100 outputs 16- and 20-bit word data without any appreciable loss of detail. The PSX-100 is a comprehensive system. The A/D and D/A sections can function independently of one another and can be clocked separately or cross-connected. Built into the unit are all the industry-standard interfaces, including multiple AES/EBU, S/PDIF (both coaxial and optical), Tascam TDIF and Alesis Lightpipe. The PSX-100 supports high-density sample rates (88.2 and 96 kHz) and the more conventional 44.1 and 48kHz sample rates. One particularly useful feature is an Aux AES/EBU output that always outputs 24-bit full-resolution audio, regardless of what else may be taking place. This feature is very convenient because you can mix to a 24-bit device while taking advantage of the UV22 technology to reduce the bit count for a simultaneous mix to a conventional 16-bit DAT recorder. In terms of its functions and internal operating modes, the PSX-100 does some very cool stuff. In case you were wondering what on earth you might use to cap-ture a 24-bit/96kHz stereo mix, Apogee Bit-Splitting (ABS) technology enables you to use a conventional MDM recorder. If, for example, you are mixing a 24-bit, 44.1kHz recording to your ADAT or DA-88, the ABS technology uses four tracks to accomplish this. The PSX-100 effectively prints the left channels first 16 bits to track 1 while placing the remaining eight least significant bits (LSB) onto track 2. The right channel is handled similarly by using tracks 3 and 4. For a 24-bit/96kHz recording, Apogees ABS-96 technology divides the data down the middle again and, hence, uses tracks 1-4 for the left channel and tracks 5-8 for the right channel. Other noteworthy features include a Soft Limit function that provides maximum digital level to a recording without incurring overruns, the metering of either the A/D output or the D/A input, a Digital Copy Mode to facilitate conversions between the various supported formats, and an Analog Monitor Mode for monitoring the A/D output through the D/A converter. Additionally, an optional video card can provide sync to PAL, NTSC or black-and-white video signals. The PSX-100s faceplate is well- organized, making it easy to navigate the various system parameters. A single multiple-press button enables you to select A/D sync options such as the units internal crystal with a sampling rate of 44.1/88.2 kHz or 48/96 kHz-along with options for an external clock source and lock status. Other similar keys allow you to select output resolutions (24-bit, UV22 20-bit, UV22 16-bit) and to define the state of the TOS link port-either S/PDIF or ADAT optical. A small flathead screwdriver is all you need to calibrate both the D/A and A/D converters through the convenient recessed access holes in the front panel. The factory default for the D/A converter is set so that an incoming digital signal at -16dBFS produces a level of +4dBU at the analog outputs."