The Metric Halo ULN-2 Expanded is the result of a dream to create a piece of audio gear that provides unbelievable audio quality while at the same time offering a degree of mobility and convenience that until very recently was simply not possible. The successful integration of world-class analog stages, excellent A/D/A conversion, and the amazing digital mixing, routing and FireWire connectivity that has already made the Mobile I/O line famous, places the Metric Halo ULN-2 in a unique position among computer audio interfaces.
The Metric Halo ULN-2 Expanded is a portable, high–quality, modular FireWire–based multi-format audio converter, interface, and processor for professional audio applications. The Metric Halo ULN-2 is equipped with two balanced analog inputs on Neutrik™ combo connectors, two channels of Digital I/O (AES/EBU and S/PDIF), eight channels of ADAT optical I/O with switchable TOSLINK support, two balanced analog outputs (1/4" TRS), two balanced monitor outputs for connecting directly to power amps and self powered monitors, as well as wordclock in/out and 2 IEEE 1394 FireWire connectors that support 400 Mbs operation.
With the transformer option installed, the Metric Halo ULN-2 acquires that classic character. A few years ago, we fitted a prototype Metric Halo ULN-2 with a pair Jensen JT16-A's just for fun. We found that there were some very nice benefits to transformer coupling the input stage of the ULN-2. The Transformers impart a more "glossy", "smoothed" sound than the capacitively coupled Metric Halo ULN-2, which simply faithfully passes the source. Sonically, it's kind of like the difference between images shot on film and images shot in HD.