Well, the saga continues.
Last night I installed my new Asus Xonar Essence STX sound card. Some install info
here.
It's a good card with a decent headphone amp built into it. When running headphones direct from the card, you can select 3 different impedance settings, < 68 ohms, 68-300 ohms, and 300-600 ohms. I tried two different phones last night. My
Sony MDR-7506 63 Ohm and my
AKG K240 DF II 600 Ohm headphones. The Sony's sounded like they always have and was not expecting anything new there. What really surprised me was the AKG's seem to come to life. I have never heard these phones sound so good. It tells me I have always been driving them with the wrong impedance due to lack of proper equipment. I found myself staying up waaaaay too late last night listening to different lossless files at 24-bit, 96k vinyl transfers. It was amazing. The sound staging and presence was impressive, very impressive. It brought a whole new life to my old AKG's. Now I am REALLY excited to get my Sennheiser's which are not back ordered until the 11th according the email I just got.
The downside to this sound card, and something I still need to work though is the SPDIF out. I had lots of issues with digital drops, lack of audio, lack of 24bit/192k support as advertised. I could only get it to work through my mixamp 5.8 at 24bit, 44.1k/48k rates. The other thing I noticed was the surround button on the mixamp had zero effect. I also discovered that the SPDIF is pre-EVERYTHING. The driver's eq, DSP, Balance, etc have absolutely no effect on the SPDIF signal. The only thing that was effected from the driver was the volume. All other settings had zero effect. I will try some different optical cables tonight to see if I can stabilize the signal. In some of my reading, I did discover that I needed to turn all Dolby Digital effects off, to just send the stereo SPDIF signal to the Mixamp and let the Mixamp to the encoding. I will try that tonight and report back, but first I need to get the digital PCM via TOSLink signal to quit dropping and popping on me.
[Edit] Worked through the S/PDIF situation last night and have come to the conclusion that the Mixamp 5.8 cannot accept any signal greater than 24-bit/48k. I also discovered that my audio card can up-mix stereo to Dolby Digital 5.1, Headphone, and DD Virtual Speaker but not of this encoding is passed through the S/PDIF. What this means is that the source material must be encoded Dolby Digital first for it to be processed on the Mixamp 5.8 as such. I did test a couple A/52 over S/PDIF which sounded pretty good, but again, limited to the 24-bit/48k sample rates because of the Mixamp 5.8. My next step is to run a optical over to my Receiver that can accept up to 192k sample rates and see how it handles the information.
I also played a good 2 hour session in Battlefield 3 last night with the Mixamp 5.8 with the Asus driver managing the S/PDIF output. It sounded good! Really good. I was hearing new things for the first time. Directional staging was really good. The Dolby Digital Surround button still did not produce any change in the audio to the headphones, but it sounded so good, I question myself if it's even required. So then the question is, will games offer Dolby Digital encoded audio? Seems that is going to be a resounding "NO" for the PC gaming industry. PS3/XBox seems to have standardized this, but PC games will continue with other Audio standards and allow sound cards to provide the post processing.
So, the next step in my testing is:
1.) Try S/PDIF to the receiver and see how the audio encodes at 192k.
2.) Try the Mixamp 5.8 with my PS3 to test the Dolby Digital 5.1 encoder on the Mixamp that I have yet to experience.
3.) Try gaming via the analog outputs on the Sound Card, the way it was designed to be heard.