Sorry, but the guy doing the review, does not have all the correct facts....
I saw that below someone asked if you can record audio to USB and he reply that was not possible, and even the PSR S670,770,970,A3000,S775 and 975 can do that.....
I have not hear that "boominest", in anyway, My guess he does not know how to adjust the EQ.
I never had that problem and play in many S970s and now in S975s and I can contour the sound in the way I want.
I assisted a 93 year old lady player (Vivian), that obviously would not want that, I adjusted for her, and by the way, she is a GREAT player, not a problem...
My 2 cents.
Manuel
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mdorantes