Hi Jose, I'm sure I plugged the TWO discrete audio main outputs (on my Tyros) to two separate audio inputs on the PAS. I suspect my problem may have been with the preset EQ settings I used on the PAS itself.

It's been over a year since I auditioned the PAS, and as I recall reading, Bose fairly recently (within the last year) updated the PAS to now include more EQ setting options. Is this true?

Jose, please share with me exactly which specific Bose PAS: 'presets' & 'eq settings' you used in order to get the Tyros stereo sampled "GRAND PIANO" patch to sound satisfying. Once you do this, I'll be sure to take my Tyros into my local Guitar Center Store and give the Bose PAS another audition (with YOUR settings this time). Thanks. - Scott