Motu 828

It is a single-rack unit device with 8 input and 8 output channels. I only use two of them with WinMLS. The loopback response is an impulse and the transfer function is flat in both magnitude and phase. The noise floor is very low. The price is about $750 USD. See frequency response below.

See below and  http://www.motu.com for information.

• sampling rates 44.1, 48K

• 24-bit analog converters.

• CueMix Plus? zero-latency hardware patchthru system.

• Sample-accurate digital transfers between ADAT digital tape decks and the computer via the ADAT sync port.

• Eight 24-bit analog outputs on balanced/unbalanced 1/4" TRS jacks

• Six 24-bit analog inputs on balanced/unbalanced 1/4" TRS jacks

• Two 24-bit analog inputs on balanced/unbalanced 1/4"/XLR combo Neutrik connectors.

• Two mic pre-amps with switchable 48-volt phantom power on the front panel.

• 105dB dynamic range

• Front panel volume control over monitor input level on main outs.

• Front panel headphone jack with independent volume control.

• Front panel signal present LEDs for all analog and digital I/O.

• Trim controls for all inputs on front panel.

• Dedicated front panel clock status LEDs.

• 8 channels of 24-bit ADAT optical input/output.

• Stereo S/PDIF in/out in optical and coax formats - ADAT lightpipe and S/PDIF optical formats share the same jacks and can not be used at the same time. However, you may use ADAT lightpipe in and optical S/PDIF out simultaneously and the S/PDIF coax I/O and lightpipe I/O may be used simultaneously.analog inputs 8 channels, analog outputs 8 channels, S/PDIF RCA 2 channels, S/PDIF optical 2 channels, ADAT Lightpipe 8 channels, protocol: FireWire