Has anyone heard Yamaha's AFC reverb in action? Is it any good? How does it compare with convolution and algorithmic reverb, in terms of realism?
I know Viscount offer it on their Prestige 100 model as an option.</p>
Blurb from Yamaha...</p>
<span class="text-12"><span class="text1">
A reverberation time in a room can be extended by increasing the energy
density. AFC actively utilizes the acoustical feedback of a system to
increase the energy density of diffused sound, so that reverberation
time and sound energy density can be controlled with auditory
naturalness while preserving the original acoustical characteristics of
a room.
</span>

<span class="text1">Since AFC utilizes acoustical feedback, it is
essential to prevent coloration problems caused by a closed loop
condition and to maintain a stable system. In order to ensure smooth
loop gain and a sufficient margin against howling, which prevents
instability, two patented Time- varying controls, Electronic Microphone
Rotator (EMR) and fluctuating FIR (fluc-FIR), are implemented in the
AFC system.</span></span> </p>

It seems like an interesting system and seems quite unique. Apparently a couple of concert halls have installed AFC systems to improve acoustics.</p>
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