"Crispy" to me is a dryer, brighter sound...the Tyros4 has a smooth sound, and, having played both it and the T5 through the earphones I carry in my brief case, I felt the Tyros5 was a tad less mellow...still smooth, and certainly not harsh in any way.

Neither are lacking in detail.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.