Here is an update on the email I sent Auzentech support reguarding the headphone amplifier.
"Thank you for contacting Auzentech.
Yes, the headphone amplifier is applicable to both rear and front headphone jack.
The difference is that the Auto-mute feature is available for Front jack only.
We recommend our customers to use the rear heaphone jacek if you want to get the best sound.
Because, (It can be different accroding to the PC) during the signal is transfered through the cable of FP_Audio, there is minute difference of quality between them.
Should you have any questions, please let us know.
Sincerely, "
So there you have it, amplifier is working on both outputs but they recommend the rear port. After doing some more testing I'd have to agree, I notice on occasion I'll hear a little static or popping sound when using the front port but I haven't experienced this with the rear port yet. This is most likely do to interference from my video card and the front audio cable. Either way I continue to enjoy unbelievable sound quality with this card it and truly is worth every penny.
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