I don't think Dolby Home theater V4 was used as a replacement fro Dolby headphone. DHT4 is actually separate from the cards drivers. However, the Phoebus driver itself also has Xear surround for headphones which is similar to Dolby headphone.
I wish they had of added opamp sockets though. I am building a a few opamps bridges for friends cards so we can test them out with new opamps.
Edited by ROBSCIX - 7/14/12 at 5:35pm