I had the same experience with them on my BH Crack, they lacked energy and sparkle, until I upgraded to a 5998 Tung-Sol tube. I was pretty amazed at the difference a little tube rolling did for it. Sounded less laid back that tight, accurate bass was there and brought out more of the details. That said, I still prefer in on the Darkvoice though...just gives them that speed and energy and the bass is just delicious.
2/21/14 at 5:37pm