I am in need of a soundcard capable of Dolby Digital Live (DDL) and have come up with many options such as the older Sound Blaster X-Fi Surround 5.1 Pro and Asus Xonar U1or U3 to the newer Asus Xonar U7 and Sound Blaster Z.
Despite comparing specs on these cards there is still one factor that is not easily available that is of most importance: DDL latency. I'm hoping that users here with some experience would be able to advise on which soundcard would be best for this purpose or if there are other better choices for DDL (ie HW rather than SW encoding) that you are aware of?
I've tried to break down the issues for easier discussion:
1. What kind of latency are people getting from each card? I'm hoping in the region of >50ms would be reasonable.
2. I know Asio support is available on the newer U7 (Asio 2.2) and Z (Asio 2.0 without direct monitoring whatever that means). What are the differences in these 2 implementations of Asio and does Asio support even affect DDL encoding or only apply to analog output? If not what's the benefit of Asio?
3. Does going for USB over internal make a difference on latency? Which is preferred?