that was me asking about the "1.5 db tweak". Good point about the audibility of small adjustments!
After really wearing myself out with tripods, procedures, makeshift speaker stands, tweaking the EQ, etc.... I have finally put myself out of my own misery.
for me (I know this is heresy to some people who are VERY confident in their viewpoint)... I get more enjoyment from my two channel music in pure direct, no sub. sounds sublime and I can relax and enjoy. the pioneer elite class D amps are lovely - sufficient to replace the A/B integrated I had (which was expensive). And, I would never ever have dreamed of inserting an EQ when I had just an integrated amp, a cd player, and a pair of speakers. Never in a million years. So why would I do it now?
Also I have begun to wonder whether the thing bothering me might be more about phase/standing wave adjustments than about the acoustic EQ itself. It is possible, but I'm not so concerned about it anymore either way.
With my personal experience, biases, limitations, gear, etc... what works super is to use MCACC for mulit-channel purposes (I feel like I get a better presentation of DVD dialog and effects this way) ,,,, and pure direct for my Apple TV iTunes.
I would never presume to recommend this - the guys who say "if EQ is good for 5 channel it is good for 2 channel" are convincing.
But in the real world... MY real world anyway ... it sounds sterile.
One guy in a different thread said it this way: "Pure Direct is a hand job in a back alley, proper MCACC is a weekend with Scarlett Johansson."
I'd say that is probably true, including the fact that you will be certainly wearing a raincoat with Scarlett, and going bareback in the alley, and depending on how organic you like your experience and how hot your alley partner is, not all might prefer the same thing.
And, I'm not so sure that the value equation isn't different for two channel anyway. If you are not integrating 6 to 10 channels, six to ten different points of sound radiating toward some sweet spot (including a downfacing low frequency driver), it could be that the phase adjustments etc bring a diminishing return in exchange for the distortion of the EQ. Further, my head is decidedly NOT perfectly still in the listening position when listening to two channel music (as the mic on the tripod was) ... it is bobbing, shaking, dancing, walking around, maybe laying to one side as I drift off... and so I have come to a perfectly peaceful place using pure direct for two channel and MCACC for multi-channel. I'd rather have my balls rattling the way I want, than have a perfectly flat response for 500 hz at the microphone position along with whatever else is happening to the digital signal with MCACC.
And my hat is off to the experts who know I'm wrong about all of it - that if I had optimal speaker positioning, a tripod, and good taste, I would like MCACC better than pure direct for two channel. they are probably right.
I like no EQ, no phase adjustments, no sub, minimum distortion to the signal - for my two channel music. I feel VERY happy to have MCACC for multi-channel calibration... it is awesome. I like it better now that I have given myself permission to listen to two channel MY way though.