Jeff Rowland's Aeris DAC Impresses
The Aeris (above) uses a 24-bit AD1862 DAC chip for each channel and can accept data up to 192kHz via S/PDIF and 96kHz via Toslink and USB. The USB input uses the ubiquitous TA1020 receiver chip but rather than use it in asynchronous mode, uses a proprietary mode based on what Lucien called a feature of "TI's hidden architecture." DSP realized in a FPGA is said to eliminate jitter, or at least reduce it to a vanishingly low <10ps. A nice touch is that the volume control is implemented by varying the DAC chips' reference voltage, thus preserving digital resolution as the level is reduced.
The sound is this room on a harpsichord rendition of a Bach Well-Tempered Klavier piece was superbly uncolored, with impressive detail, though a German piece for bass voice and orchestra unmasked a low-frequency room mode.