Originally Posted by Perpendicular
... Did I just read right that MCACC is still applied in Pure Direct Mode but not Bass Management?...
Originally Posted by ss9001
...Pure Direct has no
MCACC and no
bass management, because no added processing is applied. Signal is what it is...
Originally Posted by rickybob
And it works that way on digital signals too?...
It could be I don't fully understand what the MCACC process does. I was under the impression that it 'equalized' your speakers from an audio-balancing standpoint, rather than apply any digital processing that would fundamentally alter the signal. There's a big difference. There is other digital processing the SC-05 can do, but like I said, I thot MCACC only did a 'balancing act', but left the signal processing alone. With these sophisticated AVRs maybe that's not true.
So, depending upon how the original source was recorded and mixed, and assuming it's stereo, the signal would only be sent to the right and left speakers using Pure Direct mode - hearing it in its original form? What other MCACC mode would there be assuming it does NOT alter the signal itself?
I never brought this up here before, because I had no interest in setting off a controversy about an assertion I could not irrefutably "prove," but, as I said before, a couple of us did some experiments and discussed our findings in the VSX-01/03 thread back in early August. I don't represent this to be scientific, merely some empirical observations. However, two of us did report the same results, and I observed them in two different receivers, a VSX-01 and a SC-07.
First, I did a very quick and dirty experiment with my VSX-01 using a stereo CD input over HDMI 2.
In Pure Direct, the Phase Control and Advanced MCACC indicator lights went off as they are supposed to. Its Digital Processing indicator stayed on, contrary to to manual. In any case, I could hear MCACC effects vary by setting, and the volume got noticeably louder when I turned it off (as it should if MCACC is active). So MCACC seemed to be engaged with Pure Direct, no matter what the indicator light said.
Bass Management also seemed to remain engaged with digital input. The subs were active with the mains set to small.
Another member reported the same results with an SP/DIF connection, so it isn’t limited to HDMI, although his DSP light did go off.
With analog input, Pure Direct did bypass Bass Management. I verified this with my SMS-1 display. In Pure direct, with the main speakers set to Small, they will reproduce a full range pattern (to the limits of their capabilities) when given a stereo analog input (the SMS-1 does not have a digital output to test). In any other mode (Direct, stereo, etc.), under the same test conditions, bass management is active and bass is reproduced by the subwoofers, not the mains.
However, even with stereo analog input, MCACC adjustments were clearly audible when switching through modes as well as when it is Off. I had settings in my VSX-01 for different parts of the room, and the shift in balance was obvious. EQ adjustments were harder to verify, but certainly seemed to be in place when I listened. This confirmed the other member‘s results.
This was totally opposite of my expectation (that there would be no MCACC correction in Pure Direct, but that bass management might be retained), so it is not just a case of hearing what I expected to hear.
I'll also admit that I didn't dig into this in any depth, so would be interested in anyone else's contrary results or alternative explanation for mine.
Based on my experience, I’d say that rickybob is right. It’s a matter of definition. The other member studied the schematics and suggested it was possible that MCACC was applied in an analog mode under Pure Direct. I couldn’t intelligently comment on that one way or the other. I also can't comment on MP3 handling as I don't listen to them.
BTW, in the 2X series manuals, Pioneer has altered it’s description of Pure Direct to indicate it applies to analog signals.