The most recent Silver Ref IC's have improvements and older ones can be updated. Silver Ref. that are more than two months old are probably not upgraded. Keep that in mind when looking at used cables.
The upgrade is very worthwhile, and if you are considering new cables the Acoustic Zen Silver Reference would be hard to beat at any price. They do take a long time to settle in, but they will be in my system for a long, long time.
The upgrade is very worthwhile, and if you are considering new cables the Acoustic Zen Silver Reference would be hard to beat at any price. They do take a long time to settle in, but they will be in my system for a long, long time.