Why you need the Crane Song Avocet IIA Stereo Precision Monitor Controller:

New DAC
The Quantum DAC is the 5th generation design from Crane Song and has less then 1pS jitter.
The Quantum DAC uses 32 bit a converter and ASRC for jitter reduction up sampling to 211KHz. Avocet has always upsampled to 211KHz. The reference clock has less then 1pS, 0.5pS typical 1Hz to 100KHz and a proprietary reconstruction filter for accurate time domain response.

New
Direct sub woofer outputs for each of the three output have been added.
The output levels are now programmable in 0.25 db steps for speaker level matching
          
Avocet  IIA is designed to solve the problems of accurate monitoring and volume control as required by workstation users, studios and mastering rooms alike. It is a stereo controller with three digital inputs, three analog inputs and a headphone system. It's comprised of a rack mounted unit and table top remote control. Avocet has many features including; dim, mute, phase, mono, and 16 bit truncation functions, plus a speaker select switch that sends line level balanced audio to one of three outputs. The six input sources have on the fly gain trim capability and all digital signals are up-sampled and jitter reduced to ensure highest accuracy during D/A conversion.

The internal headphone amplifier can be fed from the program source or an external input. Provisions for a talk back function are included.

Avocet  IIA can operate in surround up to 7.1, with the appropriate number of audio boxes in the system.