You are looking at an Avid HD Native PCIe Card in an OWC PCI Thunderbolt chassis and the HD Omni Interface. This can be used with any thunderbolt equipped computer or a tower with a PCI slot. The OWC chassis is a 2 card chassis so you can put another card in there, for example a UAD Card for more processing. This makes this combo more flexible than the HD native box that is sold. This card, interface, and chassis are all in perfect working order and are being used right now. The HD Omni interface has the same converters as the HD I/O interfaces that are used in studios around the world. This unit will do 5.1 surround monitoring and has a monitor controller built in with an alt speaker switcher. It also features 2 high quality mic preamps. All you will need is the Pro Tools software and you have a pro rig for way cheaper. The interface alone at sweetwater is 2500.00 USD and the card with no software is 1000.00USD. A Thunderbolt chassis is 500.00 so it's 5000.00 worth of stuff for 2900.00 or less! HD OMNI is your all-in-one Pro Tools|HD audio interface solution. Rocking a pair of mic pres paired with other analog and digital I/O, the HD OMNI gives you up to 8 x 8 audio paths to and from Pro Tools|HD, along with two extra channels of "Cue" output. Avid included the "Curv" analog soft-knee limiter, which allows for hotter tracking and as a safety net against transients. An integrated monitoring section and 14 x 26-channel mixer lets you monitor in up to 7.1 using the HD OMNI. Avid HD OMNI Audio Interface Features at a Glance: 4-in/8-out project audio interface Digitally controlled Mic/Line/DI preamps Flexible analog and digital I/O Same flagship converters as HD I/O Persistent surround monitoring Fold-down to any monitor format 14x26 channel mixer New Curv analog soft knee limiter Pristine audio clarity and ultra low latency through state-of-the-art A/D and D/A conversion High-quality, low-noise analog I/O: 2 premium, digitally-controlled mic/DI preamps, 4 line inputs, 8 line outputs, with true analog gain Versatile digital I/O, with sample rate conversion on all inputs: 8 channels of ADAT I/O (supports S/MUX II and IV), 2x8 channels of AES/EBU I/O, 2 channels of S/PDIF I/O Route audio independently from Pro Tools with the persistent 14X26 pass-through mixer Completely integrates with Pro Tools|HD for full routing, mixing, and monitoring control Track hotter signals and smooth out sounds with Curv, a new built-in soft-knee limiter Hear your mixes in however many channels you need, from stereo to 7.1 surround Improve communication while tracking with dedicated cue path Keep things in sync with dedicated Word Clock and Loop Sync I/O Compact 1U rack-mountable chassis Connects to Pro Tools|HD through a DigiLink Mini connection (cable and adapter included)