Returned the CT's and Bob was good enough to refund the purchase price. I chose to eat the $37 total in shipping costs from sending these back and forth a couple of times, over keeping what I couldn't verify was getting above 6000 hz. I wouldn't have been able to put these up for sale on the board with any kind of clear conscience.
The question I have for those that have done recent buys/installs is...have you, or do you have the ability to take some measurements of the actual output? I was told that "some people say they hear a big difference...others have said that they don't hear much diffference at all" Based on my experience...I'd be curious to learn if folks are hearing what they think they're hearing?