there's a lot that audyssey can do to change the sound. first when i ran it got a shrill harsh sound but then read in their faqs to toe-in the speakers & that gave me a very good sound which i was happy with.Well..my points as a neutral...
@ISO did mention in his first post that the important conclusion is to properly calibrate. Poor calibration can make things worse.
@ISO also mentioned about the distortion because of DSP.
Comment by @ISO about working for denon....this comment could have been avoided (my point of view) but i guess, it happened in the heat of the moment.
From my experience, since there is a lot of stuff going on during audyssey, there is equal chance of getting it wrong and messing something up during calibration. The reason why denon (or even marantz) may sound distorted or shrill, is not because of the amp, but because of the audyssey filters applied during calibration. This specially affects 2 channel listening, more so because audyssey calibrates all speakers for flat response including bass and with less bass, highs can sound shrill or distorted if audyssey applied wrong filters. Having said all this, a properly calibrated audyssey system will sound just fantastic without any distortion at any listening levels.
Be it Yamaha ypao or denon audyssey, key is to experiment with calibration continuously till we end up with a satisfied result. I am pretty sure everyone will agree that, no one gets the calibration done perfectly first time and it requires repeated efforts, time and definitely some patience.
To make the most of audyssey, tweaking via multieq editor app for supported avr's can make some positive difference.
Peace to all and cheers.
but unfortunately i did not take a backup of the settings and few months ago i had to do a factory reset of the avr due to its setting menu becoming inaccessible. after that i have run the audyssey some 15+ times in different configurations and setups but am not able to replicate that balanced sound, as a result its a sharp/harsh sound now. dont know why/how except maybe my MLP has moved forward a few feet so that may be affecting the audyssey. strongly recommend that when one gets a good sound you're happy with take a backup.