I just joined because I was interested specifically in this subject. I am not an audiophile, but I do like to have quality hardware to use for games. I had a really hard time following the OP because it is filled with science and that only confused me... I would appreciate someone could help me out and answer my questions in layman's terms/simple English, but I do understand some technical terms, which you will hopefully realize if you continue reading my post/reply.
I used to use Creative X-Fi Titanium with Astro A50s headset (SPDIF), which was a total net value of $300. Now I use ASUS Xonar DGX (10ohms) running UNi drivers and Sennheiser HD-280 Pro (64ohms) headphones (analogue connection), which is a total net value of only $150. However, my current setup is miles better in sound quality than my previous setup! I do not have the best sense of hearing, but I could tell that my current setup sounded much better and it was NOT a placebo effect. I can now hear sounds I never heard before and Sennheiser HD-280 Pro headphones are monitoring headphones, so they have no artificial bass or similar frequency boosters.
Since I am not big on audio, I am very content with what I have clarity-wise and sound-quality-wise. My problems rests in the fact that while I love Sennheiser HD-280 Pro headphones, I do not like Dolby Headphone positional audio that much due to high levels of reverberation and echo, even when used with an improved 7.1 Shifter profile that comes with UNi drivers. I heard SBX Pro solution in action/live and found it to be absolutely awesome and superior to Dolby Headphone. The trouble is that only Sound Blaster Z supports SBX Pro and Sound Blaster Z is rated at 22 ohms. My headphones are rated at 64ohms! That means there is a HUGE mismatch! Does that mean there is a big chance that I will frequently experience distorted sound? I am not into high volume and killing my ear-drums. I like medium-level sound that is pleasant and loud enough for me to hear footsteps behind me. Right now my ASUS Xonar DGX is rated at 10ohms, while headphones are at 64ohms. That is ALSO a mismatch, isn't it? Its not as drastic as it would be with Sound Blaster Z... I am not hearing any distortions and all frequencies sound very clear to me. But how could it also be a mismatch if ASUS Xonar DGX offers specific headphone options for headphones with sub-32ohms, 32-64ohms, and above 64 ohms? It obviously supports headphones with ohms less than 8x the soundcard ohms (10ohms)... Otherwise it would have options for headphone with 80ohms and above!!! So, I am at a loss as to whether I should get Sound Blaster Z or not. I know it would improve my positional audio experience, but it would worsen my overall quality sound, wouldn't it?
Can this issue be resolved with a cheap amp? Cheap, but good enough to be better than trying to match 22ohm Sound Blaster Z and 64ohm Sennheiser HD-280 Pro headphones. I am a bit confused about digital vs analogue signal in relation to impedance. Impedance does NOT affect digital signal, correct? Someone told me that I should get an amp and connect it to my Xonar DGX via SPDIF and then connect my headphones to the amp via analogue... Or maybe it would be cheaper to just upgrade my headphones to some above (8x22) 176 ohms?
All in all, I want to get to that SBX Pro sound without sacrificing the non-positional audio quality aspect for as little $ as possible, be it with an amp or with new headphones... Of course, if the negative effect of mismatched 22ohm soundcard and 64ohm headphones is not that severe, then I may as well just get the Sound Blaster Z soundcard and be on way enjoying SBX Pro technology. Of course if you know how to reduce Dolby Headphone reverberation by some 50%, then it would be the best solution!!!
Thank you for your time and help in advance!
Sincerely,
The New Guy