Originally Posted by rnrgagne
Right, for instance I believe that Audyssey's target curve, (which is what they exclusively came to market with upon inception) was developed with a lot of subjective tests in varying environments to emulate the intended use of the end product.
I'm not sure they can do anything about timber matching - that's over my head - but I believe
, using Audyssey as an example, that if there's a finite number of filters available, they can be moved and used where it best suits the multi-channel outcome - and that result may not be the best outcome for a single speaker.
I couldn't find it except that it says something like "measurements were done according to product instructions", but if the measurements were done using all speakers and then
they used the mono set up for evaluation wouldn't that guarantee a skewed result? If it was done with just the sub and left speaker then it would add credibility, but it's still not an app the product was designed for.
Audyssey did a lot of subjective testing and developed their own version of equal loudness curves. This data was used to develop their Dynamic EQ add-on to MultEQ. Dynamic EQ considers the actual real-time listening level and adjusts the flat bass region of its target curves, tilting the bass upward. It would have been interesting to see how MultEQ XT Pro plus Dynamic EQ would have placed in the preference test, however, that feature is not available in the Sound Equalizer and therefore was not tested.
Audyssey also continued Tom Holman's work at THX on re-equalization and developed their own versions of high frequency roll-offs and incorporated them in the Audyssey Reference Target curves. This feature would have been available in Sean's testing and so Audyssey was not at a disadvantage in this regard.
Although Sean is dubious as to the value of doing more than equalizing each satellite speaker to the same target curve, nevertheless Audyssey claims to do a more comprehensive type of timbre matching than just frequency matching. However, that feature only has utility if more than one satellite speaker is playing at the same time.
Apart from timbre matching I don't believe the basic equalization of the subwoofer and a single main speaker would be compromised by running with only one satellite speaker. Although it measures all speakers when it does its measurements, Audyssey performs the equalization on each speaker individually. That is, it runs a test signal to each individual speaker, one at a time, and then calculate the filters for each channel. So the measurements do not require a multichannel setting where all channels are active simultaneously.
In summary, the most fundamental disadvantage to Audyssey in Sean's testing wasn't that the testing was done with a single satellite speaker. It was that Dynamic EQ was not considered as Audyssey's means of intelligently altering its Reference Target curve which is flat below 4 kHz. Sean and others of course are correct, a flat target curve may not always be the optimal curve.