Originally Posted by bodosom
A couple years ago there was a thread about a subjective and objective evaluation of room correction products
. The main thrust was that subjective preference is for a smooth sloping response from elevated bass to a rolled off high. Audyssey does the latter, modulo the mid-range dip, . Has anyone tried this with the pro kit, possibly with some external help?
This does make me think about the not uncommon observation that Audyssey needs a bit of LF boost.
Audyssey's target curve, except for the midrange dip, is based on and adapted from the SMPTE-X Curve. If you google the X-curve, you will see that it is based on research and subjective evaluations of farfield sound in theaters, going back decades. It is solid, accepted science. The amount of rolloff is dependent primarily on room volume, and Pro gives us three choices based on room size.
I am personally sold on the concept of a measured HF rolloff to give the subjective perception of flat response in farfield listening. My own subjective basis for this is the sound of the Philadelphia Orchestra Ondine SACD's vs. the live sound equivalent. I was in the audience when several of these recordings were made. Of course, I was not sitting where the mikes are, but then again, mikes do not hear like people do.
In general, I believe most hi fi speakers in most rooms, even the best and costliest speakers, deliver too much HF energy. The rolloff corrects for this in a way that I subjectively have come to feel is more like a live concert. And, I also believe that if it sounds right with music, where I have a live reference, it's going to sound right with movies. The great Gordon Holt of Stereophile also concluded many decades ago that a gentle rolloff starting in the next to top octave, which is what Audyssey does, provided sound that was subjectively closest to live sound using his own master tapes.
I also believe that bass response should be measurably flat. That is what sounds best (vs. live) to my ears by far.
On the other hand, I have never seen a reasonable explanation from Audyssey that convinces me that the 2K midrange dip is in any way preferable or even sensible with good equipment. My own listening to it off and on convinces me completely that it does not hold water. So, I eliminate it.
In general, applying Audyssey, particularly Pro has been a sonic revelation that, coupled with discrete Mch recording, has pushed my sound beyond absolutely anything I dreamed possible after many decades as an audiophile and frequent concert attendee. Other concert going friends are in complete agreement vs. the sound of live music. Absolutely no stereo at any price without DSP EQ, and I have heard quite a few at insanely high prices, comes remotely close.