So in my recent trade with antonyfirst on HF, Tony sent me some extra felt to play with. He sent some really dense Purple felt and some Blue Cashmere felt that he'd had great success with in the NAD RP18. He sent other felt as well that I haven't tried yet.
Before damping the NADs I wanted to get really familiar with them, so instead tonight I redamped my Chocolate Donut MkII. I used the dense felt at the back of the cup followed by the Yamaha Yellow foam, then the Cashmere Blue felt next to the driver with a 1/2" paper reflex dot centered on the backside of the Blue felt.
Let me start by saying that I've always fealt that Skylab's YH-100 based Strawberry Donuts had a bit deeper bass than mine, and I was never quite sure why. Well now I've definitely picked up a little deeper bass with this redamp. From memory I'd say it's about the same as Rob's Donuts. But the surprise was the added sparkle in the upper register. I have to think the reflex dot is responsible for this.
I think this redamp is a raging success, but I was saddened that I had used too much of the Cashmere felt to be able to use it in the NAD redamping when the time comes. However after a quick search on the net I found a fabric store selling a yard of Cashmere felt for $5.95. Yes Cashmere felt! It's some closeout sale, but the good news is that I can't possibly use anywhere near that much myself. So once it arrives and I'm able to judge it, I'll have plenty to pass along.