I had the opportunity to audition the Bose PAS a second time last Sunday (March 14th). A great BIG thanks to Richard Peck, for personally bringing his PAS over 360 miles to let me audition & compare it (with my EV SxA100's) at my gig venue in Avila Beach, California on March 14th.

A couple of hours before my concert start time, I setup my Tyros keyboard along with my EV SxA100 speakers (2 channel stereo) on each side of the keyboard, while Richard concurrently set up his Bose PAS with subwoofer stage left of the keyboard. I initially ran thru a couple of my jazz standard tunes which primarily utilizes a basic jazz combo (drums, bass) while I played live acoustic stereo piano (Live Grand) comping with the left hand and right hand comping and solo/melodic parts. Thru the EV SxA100's, the piano sounded full and alive and drums and bass full bodied and smooth of which I've grown to appreciate with the EVs. I then switched to the Bose PAS going out the Tyros via the L+R mixed to mono output jack. I immediately noticed that the piano not only suddenly sounded thin & brittle (harsh), but that the overall sound now lacked the full bodied smooth sound that I had heard going thru the EVs. Overall, the Bose PAS sounded (to me) pretty good for coming from a single mono speaker ouput. The mid range frequencies have paricularly good clarity (especially for vocals), and the very deep lows (from it's sub woofer) provide good bass omph, but what was critically missing to me (as well as other musical associates who were concurrently auditioning as well) were the mid-lows. Even after Richard tried several different PAS EQ settings, both the harsh and brittle effect of mixing the Yamaha stereo acoustic piano sample to mono, could not be eliminated satisfactorily for my ears or taste, or recover the sorely missed mid low frequencies which I complained about earlier here. I then had Richard play the Tyros stereo 'live grand' piano patch himself, while I stepped into the audience area to audition. When he played the live grand piano lightly & softly, the 'live grand' piano sounded pleasing & natural, but when I asked him to play a little louder, the characteristic thin & brittle Yamaha stereo piano mixed to mono sound suddenly became apparent again. When other mono type sounds were played thru the PAS, they sounded nice (though not amazingly impressive) and filled the room in a pleasing manner, but not nearly as well as going thru my EVs (in stereo) did. My conclusion is that the Bose PAS puts out a pleasing mono output suitable for acoustic solo instrument output (especially vocals or guitar) or general background arranger keyboard for which only mono sampled keyboard voice are utilized, but for an arranger keyboard 'concert performance', where I require an impressive & dynamic sound field to my audience, then going out true stereo is a far better way to go. I can't speak for other brand arranger keyboards, but if you own a Yamaha arranger keyboard and rely on playing the acoustic piano heavily (like I do), I do not recommend the Bose PAS unless you can afford to purchase two of them ($4,000 US dollars total). If the Bose PAS was priced significantly lower, I might recommend it, but its definitely not worth its steep price in my opinion.

As much as I appreciate the benefits of the Bose PAS (quick and convenient setup/breakdown) and respect the views of others who LOVE the Bose PAS, I recommend (with a Yamaha keyboard) to go out stereo to the Motion Sound KP200S/KP100S or thru a pair discrete stereo speaker units for the benefit of a true stereo field which in my opinion offers not only a far more pleasing piano sound (on Yamaha stereo only piano samples) but far better musical depth and detail (to the audience) as well. I agree with Mike (keybplayer) and the Pro (Jim Eshleman) that going out Stereo, with Yamaha keyboards, is pretty much mandatory for an acceptable acoustic piano sound.

Scott