is both a certification process for amplifier performance, etc.
a form of sound processing.
THX processing includes several technologies, all have marketing type names, like Boundary Gain Compensation, etc. Adding THX will give a bit of high end roll-off similar to the X-Curve, for example. Rather than me spending the time to explain all this, go to THX's website and read what the processing does for yourself, plus Pioneer has descriptions in their appendix in your manual. Some like what the processing does, some don't. Personally, I don't. But many do
. I find it tends to blend the side & rear surrounds more with the fronts, resulting in less, not more, discrete separation from front to back.
and no, you don't have to use THX processing just because your speakers are THX certified. and the certification is separate from the processing. when a mfg pays for the certitication, I believe that also entitles them to enable the processing that's embedded in the DSP's which are off-the-shelf chips made by other companies, like Texas Instruments & Motorola.
to have a receiver or processor THX certified costs the company money for the testing, confirmation of results to make sure amp performance & other parameters meets THX standards and the licensing to both use THX processing & advertise that's it's certified. And it's not a small expense.Edited by ss9001 - 6/23/13 at 3:34pm