Avantgarde Zero 1 Professional Analog input and XD update EQ

We are an Avantgarde dealer selling our dealer demo Avantgarde Zero One Pros, in excellent condition.  These speakers were ordered with the Analog Input option and later updated with XD software (option for Pro model only) to activate EQ to taylor the frequency contour to compensate for room issues. 
Just plug-in a source, and you have a complete ultra-dynamic and fatigue-free system for a fraction of the cost of separate components.
Digital inputs include USB (16/48), or Toslink, coax or AES/EBU (24/192).  XLR analog input is also included in this pair.  The input signal feeds to only one speaker which serves as master. The other is slave and syncs up either wirelessly or via Ethernet cable.  
The Zero 1 Pro is a horn-loaded three-way active speaker system. Each of its two horn-loaded drivers is powered by a separate 50-watt X50 amplifier. The woofer gets a powerful 400-watt class D Hypex module. The midrange and treble amps operate in pure class A with zero NFB and share the power supply of Avantgarde's standalone XA power amp. Power to them is heavily filtered and even the control system runs off a stabilized supply. The sensitivity of the midrange and tweeter drivers is a high 104dB.
The Zero 1 Pro accepts a digital signal which is processed in that domain before D/A converters dispatch it analog to the final amplifiers. This speaker's active crossover is carried out in the digital domain. Avantgarde programmed a 64-bit FPGA for high response/phase precision down to 10Hz. Finite impulse response or FIR filters guarantee outstanding impulse response for all six channels of D/A conversion. The German engineers shaped their filters to achieve almost perfect phase characteristics which in the Pro version nets less than 5° of deviation and nearly absolute synchronicity. Digital filters usually run very steep slopes to most effectively limit overlap between drivers. Many designers and music enthusiasts believe that the best results really come from the shallowest of filters, i.e. a 1st-order slope at 6dB/octave. Avantgarde too subscribe to this view, hence their progressive slopes. At the crossover points 6dB slopes rise progressively until they hit 100dB steepness at the intended cut-off points. 
Jonathan Valin wrote: "These extremely ingenious speakers were truly designed on a blank slate. They make brilliant use of Digital Age technologies (developed for Avantgarde by Danish DSP guru Thomas Holm) to solve many of the intrinsic problems of horn loudspeakers, and in particular those issues that have been the biggest stumbling blocks for me—coherence and coloration. That they succeed in doing so to an extent I wouldn’t have believed possible (had I not heard them) is a wonderment. It is also, I confess, the best argument I’ve yet come across for using DSP to optimize the performance of a transducer."
J.V. added that "What the Zero 1s really sound like is precisely what they are: horn loudspeakers without the horn-loudspeaker colorations." "All of the good things that you expect from a horn loudspeaker are there: the far-truer-to-life (and faithful-to-the-source) dynamic range; the fine low-level detail about instruments and performance; the superior speed of attack; the lifelike presence on voice and instruments. What aren’t there to any appreciable degree are the bad things that you also expect from a horn loudspeaker: the lack of driver-to-driver coherence, the poor-to-nonexistent integration of the woofer or sub, the “horn-colored” midrange and/or piercingly directional tweeter, the six-foot-wide imaging, and (to a degree) the truncated soundstaging. Here, for the one and only time in my experience, is a horn system that, minus an occasional dollop of extra sibilance (not brightness, mind you), does disappear as a sound source."
J.V. concluded: "To put this plainly, if you’re looking for the benefits of horns without their downside and you use digital sources almost exclusively, I can’t recommend the Avantgarde Acoustic Zero 1 active, horn-loaded, digitally-optimized, virtual plug ’n’ play loudspeaker highly enough."
Thanks for looking and feel free to contact me.
Ron Blue Smoke Entertainment Systems (847) 977-0220