Originally Posted by Roger Dressler
Ash, thanks for the further info. I can certainly see how switching to 7.1 discrete or to HD audio will make a subjective difference.
Ah, I was about to ask why, if switching from CB3 to CB3HD one did not simply migrate the calibrations to the new unit. Changing the MLP throws all that out.
More then just the addition of the HD codecs were made to the Casablanca and these changes may be cause to recalibrate, even if you don't change the listening position nor the position of the speakers and these changes even effect the older formats.
There may in fact be more then just subjective differences when switching from a CB-III to CB-IIIHD, but it's more easily described subjectively.
I believe that a great deal of the audible changes that some of us may be experiancing are also measurable!
They are probably due to the totally new power supply in the CB-IIIHD and because of the new power supply alone, I think just about everyone will find the need to recalibrate their system.
For instance, the anlalog inputs must be measurably more sensitive then they previously were because "for me", the lights that indicate the input is being driven into distortion come on when set to the same levels that I had previously used when it was a CB-III.
I've found it necessary to cut all analog input levels by 2db in order to avoid driving the inputs into distortion.
I realize that they simply could have made the lights themselves more sensitive and they just light up more easily, but that's not what my ears are telling me.
So, I've got to believe that the analog input itself is in fact more sensitive then it previously was, although I have no other way to measure the inputs sensitivity, aside from what the lights indicate.
For a digital input of course, there is no similar type of indicator lighting.
Because of this alone, I think it's best to recalibrate everything, just to be on the safe side.
Someones old settings may get them close, but everything will no doubt be off by just a touch.