Dan - I also like Audience Au24 digital cables and coincidentally, have some in my system. I've been studying the BB issue for a while now. As you may know, I have a Genesis Digital Lens in my system also, and recently been doing blind A/B comparisons between the Lens and the BB. One issue is that I believe the BB is adding about 1-2 db of gain.
I'm reading all of the accounts of BB AND Power Supply upgrades with some skepticism. I think we all have our biases....and see very little objective testing going on. I'm sick of reading...."I plugged this in and heard immediate improvement".....or "This modification will change your life." To me, that's cause for skepticism...although i've probably done it myself on occasion.
I believe people, like myself, who spend $1500 on a BB have to be very careful not to have a biased slant WANTING to hear improvement.
Similarly, I believe those who are deeply involved in structurally modding equipment (like yourself and others) will be biased AGAINST hearing substantial improvement from a box tweak like the Big Ben.
That's why I'm sending a unit to my friend Steve, because I trust his opinion. But I believe he starts with some basic biases as well. I'm actually looking forward to having one of the BB out of my system for a couple of weeks, because I think this will help sort out this issue also. We'll see how much I miss it!!!
Anyway, I'm learning a lot about my system as we sort through these issues...and greatly appreciate your contributions.