The first day of the meet we were runnung the Pass amp. The second day we ran the Class-D amp...sort of.
Class-D amps are a bit of a tricky beast. So, there is two ways of going about it: 1) Simply by a amp module and stick it in our enclosure, or 2) build one around the Class-D amp chips that are available.
The amp we were trying to get running has the same module as the commercially available CA-S3 seen here:
This is the amp we were running on the second day, it was just shoved inside our Desktop Enclosure whole! Yes, it's that small. I didn't consider it cheating, because it is the electronics we were considering putting inside our enclosure and I told people that's what was going on if they asked about the amp. But I'm not sure that's the direction we'll go.
One of the issues is that I'm not sure a 20Watt amp is really enough. It played pleanty loud, but if you were able to listen critically, you'd hear a bit of compression at strong listening levels. So we're still investigating options.
For example B&O has a yet to be released Class-D amp module that's a 50 Watt amp. Here's what one of their other modules look like:
To me, the important observation with class-D amps is that when engineered and built properly the almost instantly get you to entry-to-mid-level audiophile performance at surprising low cost; they all sound about the same---quite good---right out of the box. But because they are using some very high speed circuits, if they aren't quite optimal, they're quite problematic. Therefore, we're a little hesitant to design and build them ourselves. (No reason to burden you guys with R&D when we can just plop a module in there that sounds as good as we could do without the burden of R&D.)
Also, going with someone elses modules allows us to bring the product out relatively quickly. We're planning to have the speaker stands for sale by Christmas; we'd like to have the class-D amp available by then too, but we'll just have to see if money allows the inventory increase by then. In any case it won't be too far behind we hope.